POWDER CORES MPP/High Flux/Sendust/Power Flux/Ultral Flux

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1 POWDER CORES MPP/High Flux/Sendust/Power Flux/Ultral Flux DONGBU ELECTRONIC MATERIALS Innovation for a creating Customer value

2 Introduction Dongbu Electrinic Materials Co., Ltd. is a fine chemical product manufacturer jointly invested by Dongbu Hannong Chemical Co., Ltd. and korea Technology Promotion Co. (corporation invested by KAIST) Agrochemical technicals market in Korea relied soley on imports until Dongbu Fine Chemicals succeeded in localizing agrochemical technicals for the first time in Korea. The company has also achieved stable distribution and price stability of agricultural chemicals. Dongbu Electrinic Materials Co., Ltd. developed over 6 products of agrochemicals technicals with 3 of those items in the market currently. After the establishment of Fine Chemical Technology Institute, the company is in the process of developing other areas of fine chemistry such as polymer materials, their intermediates, and pure elcctronic reagents with a stable foundation of accumulated skills. Dongbu Fine Chemicals Co., Ltd. is a future-oriented company, which will lead the fine chemical industry to a high-valued industry. In 1999, Dongbu Electrinic Materials participated the magnetic Powder Cores business whose subsidiary company, Dongbu Steel Co., Ltd. s t a r t e d a n d d e v e l o p e d o r i g i n a l l y. A n d established new manufacturing facilities included entire process from purchasing raw materials to the final test. In 21, We got QS-9/ISO92 quality systems from KSA(Korea Standard Associates) after getting QS-9/ISO92 quality systems, our quality was very upgraded. MPC products include Molypermalloy Powder Cores (MPP), Sendust Powder Cores, High Flux Powder Cores (HF) and Power Flux Cores (PF) which are made of metal alloy powders such as nickel, iron, aluminum, silicon and molydbenum. Through their functional properties of automatic voltage control, power conversion and electromagnetic wave and noise reduction, these MPC products are the core parts in all kinds of power supply for electronic and telecommunication appliances. To satisfy customer s requirements, We will try to increase our capability and reliability continuously to get the most competitive power.

3 Innovation for Creating Customer Value Contents 2 General Information 2 Application 3 Core Identification Name Code of Materials and Color of Toroidal Cores Apparent Inductance in 1, turns 4 Breakdown Voltage and Coating Materials Tolerance of Apparent Inductance Unit Pack Quantity 5 Core Dimension Table 6 Winding Data 7 Single Layer Winding Capacity 9 Wire Table 1 Technical Information 1 Magnetic Design Formula 12 Conversion Table 14 Permeability vs. Frequency 16 Normal Magnetizing Curves 18 Permeability vs. AC Flux Density 2 Permeability vs. DC Bias Curves 22 Factors of Permeability vs DC Bias Fit Formula 24 Factors of Percentage Permeability (x1) calculation 26 Typical Core Loss of MPP 28 Typical Core Loss of High Flux 3 Typical Core Loss of Sendust 31 Typical Core Loss of Power Flux 32 Temperature Stability 34 Symbol and Units 35 Glossary of Terms 41 Dimension and Reference Table 5 Standard MPC (Magnetic Powder Core) Toroidal Series 82 Special Core Data 82 Special Height UP/Down MPC Core Series 84 Special Sendust 9μCore Series 85 Dongbu Special Shape Core Data 86 E-Core series 87 Block-Core series 88 U-Core series

4 Application MPP Cores High Resistivity Features Inductors for Q Application Low Hysteresis and Eddy Current Loss Excellent Inductance Stability under High DC-Bias condition Excellent Temperature Stability Low Loss Filter Circuits Loading Coils Transformers, Chokes and Inductors Loading Coils High Flux Cores Features Excellent DC-Bias Characteristics High B max of 15, Gauss Compared to MPP or Ferrites Core Loss Significantly Lower than Iron Powder Cores Large Energy Storage Capacity In-line Noise Filters Switching Regulator Inductors Pulse Transformers, Fly-back Transformers, PFC Chokes Output Choke Application Sendust Cores Features Core Loss Lower than Iron Powder Cores Good DC-Bias Characteristics Low Core Loss / Good DC-Bias Application Switching Regulator Inductors In-line Noise Filters Pulse Transformers, Fly-back Transformers PFC Chokes Power Flux Cores Features Application Excellent DC-Bias Property Power choke for high current (over 5A) Good Temperature Stability Core Loss Lower than Fe-Si Strip Cores Power inductor for energy storage (solar cell, wind energy) Power output stage inductor Basic Material Properties Core Material Permeability ( μ ) Flux Density(G) Perm. Vs. DC bias Core Loss Curie Temp. ( ) Temp. Stability MPP 14~125 7 Better Lowest 45 Best High High Flux 14~ Best Low 5 Better Medium Sendust 14~125 1 Good Medium 5 Good Low Power Flux 6~9 16 Best Medium 5 Good Low Relative Cost 2 Dongbu Electronic Materials

5 Core Identification Each alloy powder cores of Dongbu is coated with epoxy resin and marked with a part number. Sometimes, in the case of customer s special requirement, some cores are coated with parylene coating. A part number means core identification and it includes name code of materials, core outer diameter, apparent inductance code temperature stability code and inductance tolerance band code. General Information Core identification for easy distinction is following as below. (example) MPC Toroidal Core Series M A Temperature stability Inductance Size Material : inductance temperature stability : apparent inductance (mh) factor for 1, turns : outer diameter of core before coating (1/1Inch) : material code (M:MPP, H:High Flux, S:Sendust, W:Power Flux) Normally, name code of materials, outer diameter of bare core, apparent inductance in 1, turns and inductance temperature stability are stamped on the outside of the core. But, for customer order, tolerance band of apparent inductance is marked in packing label. Name Code of Materials and Color of Toroidal Cores Brand Name Material Core Color Material Code MPP Fe-Ni-Mo alloy powder Grey M High Flux Fe-Ni alloy powder Khaki H Sendust Fe-Si-Al alloy powder Black S Power Flux Fe-Si alloy powder Bluish Green W Apparent Inductance in 1 turns Apparent inductance is value in mh/1 turns. (AL value is the inductance(nh) per turn squared.) 3

6 Breakdown Voltage and coating materials It means breakdown voltage of core and is as the below [ Table 1 ] : [ Table 1 ] Breakdown voltage Coating Material Guaranteed Breakdown Voltage UL Number Parylene coating >.5kV (min.) - Epoxy coating >.5kV (min.) UL94V- Tolerance of Apparent Inductance OD (1/1 inch) Tolerance 14 ~ 18-15% ~ +15% 25 ~ 44-12% ~ +12% 5 ~ -8% ~ +8% Unit Pack Quantity Quantity Quantity Quantity Quantity Core Size Page Core Size Page Core Size Page Core Size (pcs/box) (pcs/box) (pcs/box) (pcs/box) Page 14 6, , , , , , , , , , , 56, , , , , , , 59, Dongbu Electronic Materials

7 Core dimension Table Part Number Window Area (cm 2 ) Cross Section Ae(cm 2 ) Magnetic Path Length (cm) Surface Area Ae(cm 2 ) After finish 4% winding factor Dimension(mm) OD(Max) x ID(Min) x HT(Max) Before Finish 4% winding factor General Information x 1.78 x x 1.27 x x 2.24 x x 1.73 x x 2.36 x x 1.85 x x 2.79 x x 2.29 x x 2.67 x x 2.16 x x 2.67 x x 2.16 x x 3.96 x x 3.43 x x 4.78 x x 4.27 x x 4.78 x x 4.27 x x 5.8 x x 4.57 x x 6.35 x x 5.89 x x 7.62 x x 6.99 x x 1.2 x x 9.53 x x 9.65 x x 9.2 x x 12.7 x x 12.7 x x 14. x x x x 14.4 x x x x 14.7 x x 14.1 x x 19.9 x x 19.3 x x 23.4 x x x x 22.4 x x x x 24.1 x x 23.3 x x 24.1 x x x x 28.7 x x x x 31.8 x x 3.94 x x 26.4 x x 25.6 x x 35.6 x x 34.7 x x 32.6 x x 27.5 x x 49.2 x x 48.2 x x 49.2 x x 48.2 x x x x x x x x x

8 Winding Data Core Size Window Area Winding Data Wire Length / Turn Wound Dimension(unity) 1% (unity) % OD(max) HT(max) cm 3 Cir-Mils cm ft cm ft cm in cm in , , , , , , , , , , , , , , , , , , , , , ,26, ,484, ,14, ,871, ,525, ,55, ,55, ,818, ,818, A) Window Area = πx ID ( 2 ) 2 B) Winding factor is the ratio of wire area to available window area 4% for toroids. 7~8% for rectangular windows C) 1% winding condition assumed 6 Dongbu Electronic Materials

9 Single Layer Winding Capacity General Information Core Size ID (mm) Wire No. Wire Dia (mm) Turns / Single layer

10 Single Layer Winding Capacity Core Size ID (mm) Wire No. Wire Dia (mm) Turns / Single layer 8 Dongbu Electronic Materials

11 Wire Table General Information Wire Size Resistance Ohms/Foot Wire Area Current Capacity Amperes Circular Mils cm 2 (X1-3 ) (1) (2) , , , , , , , , , , , , , , Based on maximum diameter of heavy film magnet wire with insulation (1) Based on 75 cir mil/amperes. (2) Based on 375 cir mil/amperes. Current capacity will vary according to the core geometry and wire size, and can range from 375 to 1 circular mils per ampere. 9

12 Magnetic Design Formula The inductance of a core and the number of turns can be calculated by using the following formula. inductance of wound Cores L = L N = L 1 =.4πμN 2 A x 1-2 L N 1 N 2 l A L x N Required N = desired L(nH) ( ) 1/2 A L (nh / N 2 ) Where L = induntance (μh) μ = core permeability N = number of turns A = core cross section area (cm 2 ) l = mean magnetic path length (cm) L N = inductance for N turns (μh) A L = nominal inductance(nh/n 2 ) Example) M466A L =.4π x 125 x 1 2 x.1 x = 6.6(μH) N = 1 turns (our standard wound turns for M4-66A) A =.1cm 2 (please see the page 56 ) l = 2.38cm (please see the page 56 ) L N = 66 x 1 2 x 1-3 = 6.6(μH) The relations of Permeability-Flux Density(B)-Magnetizing Force(H) H = Bmax = μ =.4πNI l Ermsx fAN B H (Ampere s Law) (Faraday s Law) Where H = magnetizing force (Oersteds) N = number of turns I = peak magnetizing current (A) l = mean magnetic path length (cm) Bmax = maximum flux density (Gauss) Erms = voltage across coil (V) A = core cross section area (cm 2 ) f = frequency (Hz) μ = material permeability Ampere s Law : The law is the magnetic equivalent of Gauss s law. It relates the circulating magnetic field in a closed loop to the electric current passing through the loop Faraday s Law : The law that defines the relationship of the voltage induced across the winding of a core to the flux density within the core 1 Dongbu Electronic Materials

13 Inductance calculation by Permeability vs. DC bias curves Specification Core : M466A Applied current : 3A 1) inductance Calculation at A L =.4π x 125 x 1 2 x.1 x = 6.6(μH) N = 1 turns (our standard wound turns for M4-66A) A =.1cm 2 (please see the page 56 ) l = 2.38cm (please see the page 56 ) L N = 66 x 1 2 x 1-3 = 6.6(μH) Technical Information 2) Magnetizing force (H : Oe) is calculated by Ampere law to achieve the roll off.4 x π x N x I.4 x π x 1 x 3 H = = = 15.8(Oe) l ) When the magnetizing force(h) is 15.8 Oe, yielding 85% of initial permeability. Therefore, the Inductance at 3A is L(3A) = 6.6 x.85 = 5.6(μH) Core loss The total core losses are made up of three main components : Hysteresis, eddy current and residual losses. Rac μl = abmaxf + cf + ef2 eddy current loss residual loss hysteresis loss total loss factor Where Rac = effective resistance (Ohm) a = hysteresis loss coefficient c = residual loss coefficient e = eddy current loss coefficient μ = same as before mentioned L = inductance Bmax = maximum flux density f = frequency 11

14 Q Factor The Q factor is the ratio of reactance to the effective resistance and is often used as measure of performance. So, the Q factor represents the effect of electrical resistance. Q = ω L Rdc + Rac + Rd = Reactance Total Resistance Where Q = quality factor ω = 2 π f (Hz) L = inductance (H) Rdc = DC winding resistance (Ohm) Rac = resistance due to core losses (Ohm) Rd = resistance due to winding dielectric losses (Ohm) Physical constant of core Le = Ae = π(od-id) In OD ID OD-ID 2 Ve = Le x Ae Window Area = π x x HT ( ) 2 ID 2 Le = effective mean magnetic path length (cm) Ae = effective core cross section area (cm 2 ) Ve = effective core volume (cm 3 ) OD = core outer diameter before coating (cm) ID = core inner diameter before coating (cm) HT = core height before coating (cm) Conversion Table CGS (unit) By To obtain (unit) Factor Magnetic Flux Density (B) Gauss (G) 1-4 Tesla (T) 1T=1 4 G Magnetizing Force (H) Oersted (Oe) Amperes per Meter (A/m) 1A/m=4π/1 3 Oe 12 Dongbu Electronic Materials

15 Temperature Rising Calculation The increase in surface temperature of a component in free-standing air due to the total power dissipation (both copper and core loss). The following formula has been used to approximate temperature rise: Temperature Rise( o C) = Total Power Loss = Copper Loss + Core Loss Surface Area means in case of wound core ( ).833 Total Power Loss (milliwatts) Surface Area(cm 2 ) Technical Information Nominal DC Resistance Nominal DC Resistance, in ohm/mh, at any given winding factor can be calculated by using the following equations: Ω/mhu Ω/mhwf = wf x Kwf Ku Where Ω /mhwf = Ω mh for chosen winding factor Ω /mhu = unity value, listed for each core size wf = chosen winding factor Kwf = length/turn for chosen wf* K u = length/turn for unity(1%) wf* * see winding Turn Length on core size pages The value of Rdc for any given winding factor can be computed as follows: Rdcwf = Rdcu x wfx Kwf Ku Where Rdcwf = Rdc for chosen winding factor Rdcu = unity value, listed for each core size(ohms) wf = chosen winding factor Kwf = length/turn for chosen wf* Ku = length/turn for unity(1%) wf* * see winding Turn Length on core size pages 13

16 Permeability vs. Frequency 1 9 MPP 14μ 26μ 6μ Percent Permeability(%) μ Frequency (khz) High Flux 14μ 26μ 6μ Percent Permeability(%) μ Frequency (khz) 14 Dongbu Electronic Materials

17 Permeability vs. Frequency Percent Permeability(%) Percent Permeability(%) Sendust Power Flux Frequency (khz) 6μ 9μ 14μ 26μ 35μ 6μ 75μ 9μ 125μ Technical Information Frequency (khz) 15

18 Normal Magnetizing Curves 8 MPP 7 Flux Density (Gauss) μ 6μ 26μ Magnetizing Force (Oersteds) Flux Density (Gauss) High Flux Magnetizing Force (Oersteds) 125μ 6μ 26μ 16 Dongbu Electronic Materials

19 Normal Magnetizing Curves Flux Density (Gauss) Flux Density (Gauss) Sendust Magnetizing Force (Oersteds) Power Flux μ 125μ 9μ 6μ 75μ 6μ 26μ Technical Information Magnetizing Force (Oersteds) 17

20 Permeability vs. AC Flux Density 4 MPP Percent Change of Permeability (%) μ 6μ 26μ AC Flux Density (Gauss) 3 High Flux 25 Percent Change of Permeability (%) μ 6μ 26μ AC Flux Density (Gauss) 18 Dongbu Electronic Materials

21 Permeability vs. AC Flux Density Sendust Percent Change of Permeability (%) μ 9μ 75μ 6μ 26μ Technical Information AC Flux Density (Gauss) 4 Power Flux percent change of permeability(%) μ AC Flux Density (Gauss) 19

22 Permeability vs. DC Bias Curves 1 MPP Percent Perm eability (%) Percent Perm eability (%) μ 6μ 26μ 14μ DC Mangnetizing Force (Oe) High Flux 125μ 6μ 26μ 14μ DC Mangnetizing Force (Oe) 2 Dongbu Electronic Materials

23 Permeability vs. DC Bias Curves Percent Perm eability (%) Percent Perm eability (%) Sendust μ 9 μ 75μ6μ 35μ 26μ 14μ DC Mangnetizing Force (Oe) Power Flux μ 6μ Technical Information Technical Information DC Mangnetizing Force (Oe) 21

24 Factors of Permeability vs. DC Bias Fit Formula μ e ff = a 2 3 μ + μ Η + μ 1 c μ + Η + b d μ 2 4 Η Η 2 2 MPP μ a b c d E E E E E E E E E E E E E E-9-9.4E-5 3.2E-8 High Flux μ a b c d E E E E E E E E E E-1-2.5E E E E E-5 6.4E-9 22 Dongbu Electronic Materials

25 Factors of Permeability vs. DC Bias Fit Formula μ e ff = a 2 3 μ + μ Η + μ 1 c μ + Η + b d μ 2 4 Η Η 2 2 Technical Information Sendust μ a b c d E E E E E E E E E E E E E E E E E E E E E E-9 1.E E E E-9-9.6E E-8 Power Flux μ a b c d E E E E E E E E

26 Factors of Percentage Permeability (x1) calculation Ratio of Perm. = 1 + k Η + l Η 1 + mη + n Η 2 2 MPP μ k l m n E E-6-5.E-4 1.E E E-6-1.2E-3 2.E E E-6-3.5E-3 1.E E E E-2 5.E-4 High Flux μ k l m n E E-7 2.E-5 1.E E E-6 3.E-4 4.E E E-6-1.5E-3 3.E E-3 4.8E-6-4.4E-3 1.E-4 24 Dongbu Electronic Materials

27 Factors of Percentage Permeability (x1) calculation Ratio of Perm. = 1 + k Η + l Η 1 + mη + n Η 2 2 Technical Information Sendust μ k l m n E E-2-3.E-4 6.E E E-2 2.2E-3 1.E E E-2 1.7E-3 2.E E E-2 8.E-4 5.E E+1 1.2E-1 2.6E-3 6.E E E-1 9.E-4 2.E E+2 3.4E-1-1.2E-3 4.E-4 Power Flux μ k l m n E E-7 4.E-5 3.E E E-6-4.E-4 7.E

28 Typical Core Loss of MPP 1 MPP 14μ 1 Core Loss (mw/cm 3 ) 1 1 2KHz 1KHz 5KHz 25KHz 1 P L =2.33F 1.31 B Flux Density (Gauss) 1 MPP 26μ 1 Core Loss (mw/cm 3 ) 1 1 2KHz 1KHz 5KHz 25KHz 1 P L =1.39F 1.28 B Flux Density (Gauss) P L =C X F a X B b (F : khz - B : kg) Perm. C a b Dongbu Electronic Materials

29 Typical Core Loss of MPP 1 MPP 6μ Core Loss (mw/cm 3 ) KHz 1KHz 5KHz 25KHz Technical Information 1 P L =.64F 1.41 B Flux Density (Gauss) 1 MPP 125μ 1 Core Loss (mw/cm 3 ) 1 1 2KHz 1KHz 5KHz 25KHz 1 P L =1.2F 1.4 B Flux Density (Gauss) P L =C X F a X B b (F : khz - B : kg) Perm. C a b

30 Typical Core Loss of High Flux 1 HIgh Flux 14μ 1 Core Loss (mw/cm 3 ) KHz 1KHz 5KHz 25KHz P L =7.26F.95 B Flux Density (Gauss) 1 HIgh Flux 26μ 1 Core Loss (mw/cm 3 ) 1 1 2KHz 1KHz 5KHz 25KHz 1 P L =3.19F 1.22 B Flux Density (Gauss) P L =C X F a X B b (F : khz - B : kg) Perm. C a b Dongbu Electronic Materials

31 $ Typical Core Loss 1 High Flux HIDl Hlgh Flux 14 p. 1 이 " {ε E )ω ω1 '" (생 ~ 옳 OiJ' 흉 g / '2.~.1 '" 1 e P Flux Density (Ga =) HlXl l =726fO. 95Bul 1 미 III H lgh Flux 26μ (JlXJ 1αm ( / ιl 짧짧 1 &γ )생용 g1 PL =1.38F\37B23 E으 E (lXJ 1 이 lxl FI, Oensily (Gauss) a b Po<m a b PL=C x F x B (F:kHz - B:kG) c

32 Typical Core Loss of High Flux 1 HIgh Flux 6μ Core Loss (mw/cm 3 ) KHz 1KHz 5KHz 25KHz Technical Information 1 P L =3.65F 1.15 B Flux Density (Gauss) 1 HIgh Flux 125μ 1 Core Loss (mw/cm 3 ) 1 1 2KHz 1KHz 5KHz 25KHz 1 P L =1.62F 1.32 B Flux Density (Gauss) P L =C X F a X B b (F : khz - B : kg) Perm. C a b

33 Typical Core Loss of Sendust 1 sendust 14μ, 26μ 1 Core Loss (mw/cm 3 ) 1 1 2KHz 1KHz 5KHz 25KHz 1 P L =2.27F 1.26 B Flux Density (Gauss) 1 sendust 6,75,9,125μ 1 Core Loss (mw/cm 3 ) 1 1 2KHz 1KHz 5KHz 25KHz 1 P L =2.F 1.31 B Flux Density (Gauss) P L =C X F a X B b (F : khz - B : kg) Perm. C a b 14, ,75,9, Dongbu Electronic Materials

34 Typical Core Loss of Power Flux 1 Power Flux 6, 9μ Core Loss (mw/cm 3 ) KHz 1KHz 5KHz 25KHz Technical Information Flux Density (Gauss) P L = F 1.25 B 2. P L =C X F a X B b (F : khz - B : kg) Perm. C a b 6,

35 Temperature Stability MPP 3. Percent Permeability (%) μ 6μ 26μ 14μ Temperature ( o C) High Flux Percent Permeability (%) μ 6μ 26μ 14μ Temperature ( o C) 32 Dongbu Electronic Materials

36 Temperature Stability Sendust Percent Permeability (%) ,26μ 6μ 75μ 9μ Technical Information μ Temperature ( o C) 5. Power Flux Percent Permeability (%) μ 6μ Temperature ( o C) 33

37 Symbol and Units Symbol Discription Unit Ae effective cross section area of a core cm 2 AL apparent inductance nh/n 2 B magnetic flux density T Br remanence flux density T Bmax maximum flux density T Erms sinusoidal rms voltage across winding V H magnetizing force A/m Hc coercive force A/m Hmax maximum magnetizing force A/m l e effective magnetic path length cm L inductance H N number of turns - PL core loss of a core mw/cm 3 Q quality factor - V volume of a core cm 3 Rdc DC winding resistance Ω μ absolute permeability - μ e effective permeability - μ i initial permeability - μ r relative permeability - 34 Dongbu Electronic Materials

38 Glossary of terms AC flux density Number of flux lines per unit of cross-sectional area generated by an alternating magnetic field; Gauss Air Gap A non-magnetic discontinuity in a ferro-magnetic circuit. For example, the space between the poles of a magnet, although filled with brass of wood and other non-magnetic material, is nevertheless called an air gap. Core Losses Core losses are caused by an altering magnetic field in the core material. The losses are a function of the operating frequency and the total magnetic flux swing. The total core losses are made up of three main components: Hysteresis, eddy current and residual losses. These losses vary considerably from one magnetic material to another. Applications such as higher power and higher frequency switching regulators require careful core selection to yield the highest inductor performance by keeping the core losses to a minimum. Technical Information Breakdown Voltage (1)The voltage at which an insulator or dielectric ruptures, or at which ionization and conduction take place in a gas or vapor. (2) The reverse voltage at which avalanche breakdown occurs in a semiconductor. (3) Maximum AC or DC voltage that can be applied from the input to output (or chassis) of a converter without causing damage. Core Saturation The DC bias current flowing through an inductor which causes the inductance to drop by a specified amount from the initial zero DC bias inductance v a l u e. C o m m o n s p e c i f i e d i n d u c t a n c e d r o p percentages include 1% for ferrite cores and 2% for iron powder cores in energy storage applications. Also referred to as saturation current. Choke An inductor which is intended to filter, or 'choke', out unwanted signals. Copper Loss The power loss by current flowing through the winding. The power loss is equal to the square of the current multiplied by the resistance of the wire (i 2 x R). This power loss is transferred into heat. Curie Temperature The temperature at which a magnetic material loses its magnetic properties. The core's permeability typically increases dramatically as the core temperature approaches the curie temperature, which causes the inductance to increase. The permeability drops to near unity at the curie temperature, which causes the inductance to drop dramatically. The curie point is the temperature at which the initial permeability (µi) has dropped to 1% of its value at room temperature. 35

39 Glossary of terms DC Bias Direct current (DC) applied to the winding of a core in addition to any time-varying current. Inductance with DC bias is a common specification for powder cores. The inductance will 'roll off' gradually and predictably with increasing DC bias. DCR Direct Current Resistance - The resistance of the inductor winding measured with no alternating current. The DCR is most often minimized in the design of an inductor. The unit of measure is ohms and it is usually specified as a maximum rating. change of flux density. Eddy current losses are present in both the magnetic core and windings of an inductor. Eddy currents in the winding, or conductor, contribute to two main types of losses: losses due to proximity effects and skin effects. As for the core losses, an electric field around the flux lines in the magnetic field is generated by alternating magnetic flux. This will result in eddy currents if the magnetic core material has electrical conductivity. Losses result from this phenomenon since the eddy currents flow in a plane that is perpendicular to the magnetic flux lines. Eddy current and hysteresis losses are the two major core loss factors. Eddy current loss becomes dominant in powder cores as the frequency increases. Effective Permeability Distributed Capacitance (1) In the construction of an inductor, each turn of wire or conductor acts as a capacitor plate. The combined effects of each turn can be presented as a single capacitance known as the distributed capacitance. The capacitance is in parallel with the inductor. This parallel combination will resonate at some frequency, which is called the self-resonant frequency (SRF). Lower distributed capacitance for a given inductance will result in a higher SRF and vice versa. (2) Capacitance that is not concentrated within a lumped capacitor, but spread over a circuit or group of components. For a magnetic circuit constructed with an air gap, or g a p s, t h e p e r m e a b i l i t y o f a h y p o t h e t i c a l homogeneous material that would provide the same reluctance, or net permeability. EMC Electromagnetic compatibility. The ability of an electronic device to operate in its intended environment without its performance being affected by EMI and without generating EMI that will affect other equipment. Eddy Current Losses Core losses associated with the electrical resistivity of the magnetic material and induced voltages within the material. Eddy currents are inversely proportional to material resistivity and proportional to the rate of EMI Electro-Magnetic Interference - An unwanted electrical energy in any form. EMI is often used interchangeably with 'noise' and 'interference'. 36 Dongbu Electronic Materials

40 Glossary of terms Flux Density (B) The corresponding parameter for the induced magnetic field in an area perpendicular to the flux path. Flux density is determined by the field strength and permeability of the medium in which it is measured. Full Winding corresponding values of flux density for the ordinate and magnetizing force for the abscissa when the material is passing through a complete cycle between definite limits of either magnetizing force or flux density. If the material is not driven into saturation it is said to be on a minor loop. Flux Density Maximum Permeability Maximum Flux Density Technical Information A winding for toroidal cores that will result in 45% of the core's inside diameter remaining. Remanence Intial Permeability Harmonics Energy at integral multiples of the frequency of the fundamental signal. Normally expressed as THD (Total Harmonic Distortion) but can be specified for harmonics of interest in either a percentage of or decibels below the power level of the fundamental frequency signal. Coercive Force Magnetizing Force Hysteresis Loss Hysteresis means to lag behind. This is the tendency of a magnetic material to retain its magnetization. Hysteresis causes the graph of magnetic flux density versus magnetizing force (B-H curve) to form a loop rather than a line. The area of the loop represents the difference between energy stored and energy released per unit of volume of material per cycle. This difference is called the hysteresis loss. High Q filters Hysteresis Loop A closed curve obtained for a material by plotting A filter circuit (inductor and/or capacitor) that exhibits high Q. It is very frequency-sensitive and filters out or allows to pass, only those frequencies within a narrow band. 37

41 Glossary of terms Impedance The total opposition offered by a component or circuit to the flow of alternating or varying current at a particular frequency, including both the AC and DC component.. Impedance is expressed in ohms and is similar to the actual resistance in a direct current circuit. In computations, impedance is handled as a complex ratio of voltage to current. The ohm is the u n i t o f i m p e d a n c e. I m p e d a n c e i s t y p i c a l l y abbreviated as "z" or "Z". The frequency-invariant, real component of impedance is resistance. The frequency-variant, imaginary component of impedance is reactance. The reciprocal of impedance is admittance. material with changing magnetic flux density. The saturation magnetostriction coefficient has the symbols. It is change of length divided by original length (a dimensionless number) and is measured at the saturation flux density. Magnetostriction causes audible noise if the magnetostriction is sufficiently large and the applied field is AC and in the audible frequency range, e.g. 5 or 6 Hz. Mean Length Turn The average length of a single turn in the winding of the device. Inductance Factor (AL) The inductance rating of a core in nanohenries per turn squared (nh/n 2 ) based on a peak flux density of 1 gauss (1 mt) at a frequency of 1 khz. An AL value of 4 would produce 4µH of inductance for 1 turns and 4mH for 1 turns. Oersted The unit of magnetizing force in cgs units. One Oersted equals a magneto-motive force of one Gilbert per centimeter of path length. 1 Oersted = A/m=.7958 A/cm Initial Permeability That value of permeability at a peak AC flux density of 1 gauss (1 mt). Percent Permeability (%) Represents the percent change in permeability from the initial value. Magnetic Energy The product of the flux density (B) and the (de) magnetizing force (H) in a magnetic circuit required to reach that flux density. Magnetostriction The expansion and contraction of a magnetic Q factor The Q factor or quality factor is a measure of the "quality" of a resonant system. Resonant systems respond to frequencies close to their natural frequency much more strongly than they respond to other frequencies. The Q factor indicates the amount of resistance to resonance in a system. Systems with a high Q factor resonate with a greater amplitude (at the resonant frequency) than systems with a low Q factor. Damping decreases the Q factor. 38 Dongbu Electronic Materials

42 Glossary of terms Search Coil A coil inductor, usually of known area and number of turns, that is used with a fluxmeter to measure the change of flux linkage with the coil. Single-Layer Winding A winding for a toroidal core which will result in the full utilization of the inside circumference of the core without the overlapping of turns. The thickness of insulation and tightness of winding will affect results. squared in amperes. Swing 1 Estored = LI 2 2 A term used to describe how inductance responds to c h a n g e s i n c u r r e n t. E x a m p l e : A 2 : 1 s w i n g corresponds to an inductor which exhibits 2 times more inductance at very low current than it does at its maximum rated current. This would also correspond to the core operating at 5% of initial permeability (also 5% saturation) at maximum current. Technical Information Surface Area The effective surface area of a typical wound core available to dissipate heat. Skin Effect Skin effect is the tendency for alternating current to flow near the surface of the conductor in lieu of flowing in a manner as to utilize the entire crosssectional area of tile conductor. The phenomenon causes the resistance of the conductor to increase. The magnetic field associated with the current in the conductor causes eddy currents near the center of the conductor which opposes the flow of the main current flow near the center of the conductor. The main current flow is forced further to the surface as the frequency of the alternating current increasing Stored Energy The amount of energy stored, in microjoules (1-6 joules), is the product of one-half the inductance (L) in microhenries (1-6 Henries), times the current (I) Switch Mode Power Supply A power conversion technique that involves breaking the input power into pulses at a high frequency by switching it on and off and re-combining these pulses at the output stage. Using this technique, an unregulated input voltage can be converted to one or more regulated output voltages at relatively high efficiencies. Switching Frequency The rate at which the DC input to a switching regulator is switched on and off. Temperature rise Change in temperature of a terminal from a no-load condition to full-current load. Also called T rise. (2) The increase in surface temperature of a component in air due to the power dissipation in the component. The power dissipation for an inductor includes both copper and core losses. 39

43 Glossary of terms Temperature Coefficient A factor which describes the reversible change in a magnetic property with a change in temperature. The magnetic property spontaneously returns when the temperature is cycled to its original point. It usually is expressed as the percentage change per unit of temperature. Temperature Stabilization After manufacture, many types of soft and hard magnetic materials can be thermally cycled to make them less sensitive to subsequent temperature extremes. Winding Factor The ratio of the total area of copper wire inside the center hole of a toroid to the window area of the toroid. Window Area The area in and around a magnetic core which can be used for the placement of windings. 4 Dongbu Electronic Materials

44 MPP Cross Reference O.D I.D Height Dongbu Arnold Mag-Inc CSC Perm Inch mm Inch mm Inch mm M1413A MP N/A CM M1426A MP CM M157A MP N/A N/A M1517A MP N/A CM M1535A MP CM M189A MP N/A N/A M182A MP CM M1842A MP CM M251A MP N/A M2524A MP CM M255A MP CM M2611A MP CM M2626A MP CM M2654A MP CM M2621A MP CM M265A MP CM M2613A MP CM M3111A MP CM M3125A MP CM M3152A MP CM M3811A MP CM M3825A MP CM M3853A MP CM M3814A MP CM M3832A MP CM M3866A MP CM M414A MP CM M432A MP CM M466A MP CM M4411A MP CM M4426A MP CM M4453A MP CM M512A MP CM M527A MP CM M556A MP CM M6515A MP CM M6535A MP CM M6572A MP CM M6819A MP CM M6843A MP CM M6889A MP CM M814A MP CM M832A MP CM M868A MP CM M919A MP CM M943A MP CM M99A MP CM M9222A MP CM Dimension and Reference Table 41

45 MPP Cross Reference Dongbu Arnold Mag-Inc CSC O.D I.D Height Inch mm Inch mm Inch mm Perm M9251A MP CM M9215A MP CM M1632A MP CM M1675A MP CM M16157A MP CM M1328A MP CM M1361A MP CM M13127A MP CM M13516A MP CM M13538A MP CM M13579A MP CM M14124A MP CM M14156A MP CM M141127A MP CM M15735A MP CM M15781A MP CM M157168A MP CM M18459A MP CM M184135A MP CM M184281A MP CM M18437A MP CM M18486A MP CM M184178A MP CM M232A MP CM M273A MP CM M2152A MP CM M2256A MP CM M225138A MP CM M225287A MP CM M22533A MP CM M22575A MP CM M225156A MP CM M24484A N/A CM M244193A N/A CM M24442A N/A 5562 CM M363A MP CM M3668A MP CM M36142A MP CM M3637A MP CM M3685A MP CM M36178A MP CM M421A MP N/A N/A M44A MP N/A N/A M492A MP N/A N/A M425A MP CM M447A MP CM M4112A MP CM Dongbu Electronic Materials

46 High Flux Cross Reference Dongbu Arnold Mag-Inc CSC O.D I.D Height Inch mm Inch mm Inch mm Perm H1413A HF N/A CH H1426A HF N/A CH H157A HF N/A N/A H1517A HF N/A CH H1535A HF N/A CH H189A HF N/A N/A H182A HF N/A CH H1842A HF N/A CH H251A HF N/A H2524A HF CH H255A HF CH H2611A HF CH H2626A HF CH H2654A HF CH H2621A HF CH H265A HF CH H2613A HF CH H3111A HF CH H3125A HF CH H3152A HF CH H3811A HF CH H3825A HF CH H3853A HF CH H3814A HF CH H3832A HF CH H3866A HF CH H414A HF CH H432A HF CH H466A HF CH H4411A HF CH H4426A HF CH H4453A HF CH H512A HF CH H527A HF CH H556A HF CH H6515A HF CH H6535A HF CH H6572A HF CH H6819A HF CH H6843A HF CH H6889A HF CH H814A HF CH H832A HF CH H868A HF CH H919A HF CH H943A HF CH H99A HF CH H9222A HF CH Dimension and Reference Table 43

47 High Flux Cross Reference Dongbu Arnold Mag-Inc CSC O.D I.D Height Inch mm Inch mm Inch mm Perm H9251A HF CH H9215A HF CH H1632A HF CH H1675A HF CH H16157A HF CH H1328A HF CH H1361A HF CH H13127A HF CH H13516A HF CH H13538A HF CH H13579A HF CH H14124A HF CH H14156A HF CH H141127A HF CH H15735A HF CH H15781A HF CH H157168A HF CH H18459A HF CH H184135A HF CH H184281A HF CH H18437A HF CH H18486A HF CH H184178A HF CH H232A HF CH H273A HF CH H2152A HF CH H2256A HF CH H225138A HF CH H225287A HF CH H22533A HF CH H22575A HF CH H225156A HF CH H24484A N/A CH H244193A N/A CH H24442A N/A 5862 CH H363A HF CH H3668A HF CH H36142A HF CH H3637A HF CH H3685A HF CH H36178A HF CH H421A HF N/A N/A H44A HF N/A N/A H492A HF N/A N/A H425A HF CH H447A HF CH H4112A HF CH Dongbu Electronic Materials

48 Sendust Cross Reference Dongbu Arnold Mag-Inc CSC O.D I.D Height Inch mm Inch mm Inch mm Perm S1413A MS CS S1416A MS CS S1419A MS CS S1426A MS CS S157A MS N/A N/A S1517A MS CS S1521A MS CS S1525A MS CS S1535A MS CS S189A MS N/A N/A S182A MS CS S1825A MS CS S183A MS CS S1842A MS CS S251A MS N/A N/A S2524A MS CS S253A MS CS S2536A MS CS S255A MS CS S2611A MS N/A N/A S2626A MS CS S2632A MS CS S2639A MS CS S2654A MS CS S2621A MS N/A N/A S265A MS CS S2662A MS CS S2674A MS CS S2613A MS CS S3111A MS N/A N/A S3125A MS CS S3131A MS CS S3137A MS CS S3152A MS CS S3811A MS N/A N/A S3825A MS CS S3832A MS CS S3838A MS CS S3853A MS CS S3814A MS N/A N/A S3832A MS CS S384A MS CS S3848A MS CS S3866A MS CS S414A MS N/A N/A S432A MS CS S44A MS CS S448A MS CS S466A MS CS S4411A MS N/A CS S4426A MS CS S4432A MS CS S4438A MS CS Dimension and Reference Table 45

49 Sendust Cross Reference Dongbu Arnold Mag-Inc CSC O.D I.D Height Inch mm Inch mm Inch mm Perm S4453A MS CS S512A MS N/A CS S527A MS CS S534A MS CS S54A MS CS S556A MS CS S6515A MS N/A CS S6535A MS CS S6543A MS CS S6552A MS CS S6572A MS CS S6819A MS N/A CS S6843A MS CS S6853A MS CS S6864A MS CS S6889A MS CS S814A MS N/A CS S832A MS CS S841A MS CS S849A MS CS S868A MS CS S919A MS CS S943A MS CS S954A MS CS S965A MS CS S99A MS CS S9222A MS CS S9251A MS CS S9262A MS CS S9276A MS CS S9215A MS CS S1632A MS CS S1675A MS CS S1694A MS CS S16113A MS CS S16157A MS CS S1328A MS CS S1361A MS CS S1376A MS CS S1391A MS CS S13127A MS CS S13516A MS CS S13538A MS CS S13547A MS CS S13557A MS CS S13579A MS CS S14124A MS CS S14156A MS CS S1417A MS CS S14184A MS CS S141127A MS CS S15735A MS CS Dongbu Electronic Materials

50 Sendust Cross Reference Dongbu Arnold Mag-Inc CSC O.D I.D Height Inch mm Inch mm Inch mm Perm S15781A MS CS S15711A MS CS S157121A MS CS S157168A MS CS S18459A MS CS S184135A MS CS S184169A MS CS S18422A MS CS S184281A MS CS S18437A MS CS S18486A MS CS S18417A MS CS S184128A MS CS S184178A MS CS S232A MS CS S273A MS CS S291A MS CS S219A MS CS S2152A MS CS S2256A MS CS S225138A MS CS S225172A MS CS S22527A MS CS S225287A MS CS S22533A MS CS S22575A MS CS S22594A MS CS S225112A MS CS S225156A MS CS S24484A N/A CS S244193A N/A CS S244241A N/A CS S244289A N/A CS S24442A N/A N/A CS S363A MS CS S3668A MS CS S3685A MS N/A CS S3612A MS-39-2 N/A CS S36142A MS N/A CS S3637A MS CS S3685A MS CS S3617A MS N/A CS S36128A MS N/A CS S36178A MS CS S421A MS N/A N/A S44A MS N/A N/A S454A N/A N/A N/A S492A MS N/A N/A S425A MS N/A N/A S447A MS CS S463A N/A N/A N/A S4112A MS CS Dimension and Reference Table 47

51 Power Flux Cross Reference Dongbu Arnold Mag-Inc CSC O.D I.D Height Inch mm Inch mm Inch mm Perm W1411A N/A N/A N/A W1413A FS CK W1419A FS CK W1514A N/A N/A N/A W1517A FS CK W1525A FS CK W1817A N/A N/A N/A W182A FS CK W183A FS CK W252A N/A N/A N/A W2524A FS CK W2536A FS CK W2622A N/A N/A N/A W2626A FS CK W2639A FS CK W2641A N/A N/A N/A W265A FS CK W2674A FS CK W3121A N/A N/A N/A W3125A FS CK W3137A FS CK W3821A N/A N/A N/A W3825A FS CK W3838A FS CK W3826A N/A N/A N/A W3832A FS CK W3848A FS CK W426A N/A N/A N/A W432A FS CK W448A FS CK W4421A N/A N/A N/A W4426A FS CK W4438A FS CK W522A N/A N/A N/A W527A FS CK W54A FS CK W6529A N/A N/A N/A W6535A FS CK W6552A FS CK W6835A N/A N/A N/A W6843A FS CK W6864A FS CK W826A N/A N/A N/A W832A FS CK W849A FS CK W935A N/A N/A N/A W943A FS CK W965A FS CK Dongbu Electronic Materials

52 Power Flux Cross Reference Dongbu Arnold Mag-Inc CSC O.D I.D Height Inch mm Inch mm Inch mm Perm W9242A N/A N/A N/A W9251A FS CK W9276A FS CK W1662A N/A N/A N/A W1675A FS CK W16113A FS CK W135A N/A N/A N/A W1361A FS CK W1391A FS CK W13531A N/A N/A N/A W13538A FS CK W13557A FS CK W14147A N/A N/A N/A W14156A FS CK W14184A FS CK W15767A N/A N/A N/A W15781A FS CK W157121A FS CK W184112A N/A N/A N/A W184135A FS CK W18422A FS CK W1847A N/A N/A N/A W18486A FS CK W184128A FS CK W26A N/A N/A N/A W273A FS CK W219A FS CK W225115A N/A N/A N/A W225138A FS CK W22527A FS CK W22562A N/A N/A N/A W22575A FS CK W225112A FS CK W24445A N/A N/A N/A W24484A N/A N/A CK W244193A N/A N/A CK W244241A N/A N/A CK W244289A N/A N/A CK W3656A N/A N/A N/A W3668A FS CK W3612A FS-39-2 N/A CK W3671A N/A N/A N/A W3685A FS CK W36128A FS N/A CK W477A N/A N/A N/A W492A FS N/A N/A W49A N/A N/A N/A W4112A FS-46-2 N/A CK Dimension and Reference Table 49

53 (inch) (mm).14.7 Core Dimensions (after Finish) O.D.(max.) 4.19 mm.165 in I.D.(min.) 1.27 mm.5 in HT.(max.) 2.16 mm.85 in.6 Physical Constant Window Area.18 cm c.mils Cross Section Area.13 cm 2.2 in 2 M1426A Path Length.817 cm.322 in Volume.11 cm 3.1 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux W1411A 6 13 M1413A H1413A S1413A W1413A S1416A S1419A W1419A M1426A H1426A S1426A - Single Layer Single Layer AL value vs. DC Bias 4 35 A L (nh/n 2 ) H1426A M1426A S1426A 1 5 H1413A W1413A M1413A S1413A NI(AT) 5 Dongbu Electronic Materials

54 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 4.57 mm.18 in I.D.(min.) 1.73 mm.68 in HT.(max.) 3.18 mm.125 in.1 Physical Constant Window Area.3 cm c.mils Cross Section Area.21 cm 2.3 in 2 M1535A Path Length.942 cm.371 in Volume.19 cm 3.1 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux M157A H157A S159A W1514A 6 17 M1517A H1517A S1517A W1517A S1521A S1525A W1525A M1535A H1535A S1535A - Single Layer Single Layer A L (nh/n 2 ) H1535A M1535A S1535A AL value vs. DC Bias Standard MPC Toroidal Series H1517A W1517A M1517A S1517A NI(AT) 51

55 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 5.28 mm.28 in I.D.(min.) 1.85 mm.73 in HT.(max.) 3.18 mm.125 in.1 Physical Constant Window Area.29 cm c.mils Cross Section Area.28 cm 2.4 in 2 M1842A Path Length 1.62 cm.418 in Volume.3 cm 3.2 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 5 M185A H185A S185A M189A H189A S189A S1812A W1817A 6 2 M182A H182A S182A W182A S1825A S183A W183A M1842A H1842A S1842A - Single Layer Single Layer AL value vs. DC Bias H1842A M1842A S1842A A L (nh/n 2 ) H182A W182A M182A S182A NI(AT) 52 Dongbu Electronic Materials

56 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 6.99 mm.275 in I.D.(min.) 2.29 mm.9 in HT.(max.) 3.43 mm.135 in.11 Physical Constant Window Area.41 cm c.mils Cross Section Area.47 cm 2.7 in 2 M255A Path Length cm.536 in Volume.64 cm 3.4 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 6 M256A H256A S256A M251A H251A S251A S2514A W252A 6 24 M2524A H2524A S2524A W2524A S253A S2536A W2536A M255A H255A S255A - Single Layer Single Layer A L (nh/n 2 ) H255A M255A S255A AL value vs. DC Bias Standard MPC Toroidal Series H2524A W2524A M2524A S2524A NI(AT) 53

57 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 7.24 mm.285 in I.D.(min.) 2.16 mm.85 in HT.(max.) 3.18 mm.125 in.1 Physical Constant Window Area.38 cm c.mils M2654A Cross Section Area.48 cm 2.7 in 2 Path Length cm.537 in Volume.64 cm 3.4 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 6 M266A H266A S266A M2611A H2611A S2611A S2616A W2622A 6 26 M2626A H2626A S2626A W2626A S2632A S2639A W2639A M2654A H2654A S2654A - Single Layer Single Layer AL value vs. DC Bias 6 55 A L (nh/n 2 ) H2654A M2654A S2654A H2626A W2626A M2626A S2626A NI(AT) 54 Dongbu Electronic Materials

58 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 7.24mm.285 in I.D.(min.) 2.16 mm.85 in HT.(max.) 5.54 mm.218 in.188 Physical Constant Window Area.38 cm c.mils M2613A Cross Section Area.92 cm 2.14 in 2 Path Length cm.537 in Volume.125 cm 3.8 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux M2612A H2612A S2612A M2621A H2621A S2621A S2629A W2641A 6 5 M265A H265A S265A W265A S2662A S2674A W2674A M2613A H2613A S2613A - Single Layer Single Layer A L (nh/n 2 ) H2613A M2613A S2613A AL value vs. DC Bias Standard MPC Toroidal Series H265A W265A M265A S265A NI(AT) 55

59 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 8.51 mm.335 in I.D.(min.) 3.43 mm.135 in HT.(max.) 3.81 mm.15 in.125 Physical Constant Window Area.92 cm c.mils M3152A Cross Section Area.61 cm 2.9 in 2 Path Length cm.74 in Volume.19 cm 3.7 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 6 M316A H316A S316A M3111A H3111A S3111A S3115A W3121A 6 25 M3125A H3125A S3125A W3125A S3131A S3137A W3137A M3152A H3152A S3152A - Single Layer Single Layer a AL value vs. DC Bias A L (nh/n 2 ) H3152A M3152A S3152A H3125A W3125A M3125A S3125A NI(AT) 56 Dongbu Electronic Materials

60 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 1.29mm.45 in I.D.(min.) 4.27 mm.168 in HT.(max.) 3.81 mm.15 in.125 Physical Constant Window Area.142 cm c.mils M3853A Cross Section Area.75 cm 2.12 in 2 Path Length 2.18 cm.858 in Volume.163 cm 3.1 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 6 M386A H386A S386A M3811A H3811A S3811A S3815A W3821A 6 25 M3825A H3825A S3825A W3825A S3832A S3838A W3838A M3853A H3853A S3853A - A L (nh/n 2 ) 6 55 H3853A 5 M3853A 45 S3853A Single Layer AL value vs. DC Bias Single Layer Standard MPC Toroidal Series H3825A W3825A M3825A S3825A NI(AT) 57

61 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 1.29 mm.45 in I.D.(min.) 4.27 mm.168 in HT.(max.) 4.6 mm.181 in.156 Physical Constant Window Area.142 cm c.mils M3866A Cross Section Area.94 cm 2.15 in 2 Path Length 2.18 cm.858 in Volume.26 cm 3.13 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 7 M387A H387A S387A M3814A H3814A S3814A S3818A W3826A 6 32 M3832A H3832A S3832A W3832A S384A S3848A W3848A M3866A H3866A S3866A - Single Layer Single Layer AL value vs. DC Bias A L (nh/n 2 ) H3866A M3866A S3866A H3832A W3832A M3832A S3832A NI(AT) 58 Dongbu Electronic Materials

62 (inch) (mm).4.2 Core Dimensions (after Finish) O.D.(max.) 1.8mm.425 in I.D.(min.) 4.57 mm.18 in HT.(max.) 4.6 mm.181 in.156 Physical Constant Window Area.164 cm c.mils M466A Cross Section Area.1 cm 2.16 in 2 Path Length 2.38 cm.937 in Volume.238 cm 3.15 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 7 M47A H47A S47A M414A H414A S414A S418A W426A 6 32 M432A H432A S432A W432A S44A S448A W448A M466A H466A S466A - Single Layer Single Layer A L (nh/n 2 ) H466A M466A M467A AL value vs. DC Bias Standard MPC Toroidal Series 25 2 M468A M469A M47A M471A NI(AT) 59

63 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) mm.468 in I.D.(min.) 5.89 mm.232 in HT.(max.) 4.72 mm.186 in.156 Physical Constant Window Area.273 cm c.mils M4453A Cross Section Area.9 cm 2.14 in 2 Path Length 2.69 cm 1.59 in Volume.243 cm 3.15 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 6 M446A H446A S446A M4411A H4411A S4411A S4415A W4421A 6 26 M4426A H4426A S4426A W4426A S4432A S4438A W4438A M4453A H4453A S4453A - Single Layer Single Layer AL value vs. DC Bias A L (nh/n 2 ) H4453A M4453A S4453A H4426A W4426A M4426A S4426A NI(AT) 6 Dongbu Electronic Materials

64 (inch) (mm).5.3 M556A.187 O.D.(max.) Core Dimensions (after Finish) mm.53 in I.D.(min.) 6.99 mm.275 in HT.(max.) 5.51 mm.217 in Physical Constant Window Area.383 cm c.mils Cross Section Area.114 cm 2.18 in 2 Path Length 3.12 cm in Volume.356 cm 3.22 in 3 Core Information Part Number Single Layer Single Layer Perm. AL value (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 6 M57A H57A S57A M512A H512A S512A S516A W522A M527A H527A S527A W527A S534A S54A W54A M556A H556A S556A A L (nh/n 2 ) H556A M556A S556A AL value vs. DC Bias Standard MPC Toroidal Series H527A W527A M527A S527A NI(AT) 61

65 (inch) (mm).65.4 Core Dimensions (after Finish) O.D.(max.) 17.4 mm.685 in I.D.(min.) 9.53 mm.375 in HT.(max.) 7.11 mm.28 in.25 Physical Constant Window Area.713 cm c.mils M6572A Cross Section Area.192 cm 2.3 in 2 Path Length 4.11 cm in Volume.789 cm 3.48 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 8 M658A H658A S658A M6515A H6515A S6515A S652A W6529A 6 35 M6535A H6535A S6535A W6535A S6543A S6552A W6552A M6572A H6572A S6572A - Single Layer Single Layer AL value vs. DC Bias A L (nh/n 2 ) H6572A M6572A S6572A H6535A W6535A M6535A S6535A NI(AT) 62 Dongbu Electronic Materials

66 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 18.3 mm.71 in I.D.(min.) 9.2 mm.355 in HT.(max.) 7.11 mm.28 in.25 Physical Constant Window Area.576 cm c.mils M6889A Cross Section Area.232 cm 2.36 in 2 Path Length 4.14 cm 1.63 in Volume.96 cm 3.59 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 1 M681A H681A S681A M6819A H6819A S6819A S6825A W6835A 6 43 M6843A H6843A S6843A W6843A S6853A S6864A W6864A M6889A H6889A S6889A - Single Layer Single Layer A L (nh/n 2 ) H6889A M6889A S6889A AL value vs. DC Bias H6843A W6843A M6843A S6843A Standard MPC Toroidal Series NI(AT) 63

67 (inch) (mm).8.5 Core Dimensions (after Finish) O.D.(max.) 21.1 mm.831 in I.D.(min.) 12.7 mm.475 in HT.(max.) 7.11 mm.28 in.25 Physical Constant Window Area 1.14 cm c.mils M868A Cross Section Area.226 cm 2.35 in 2 Path Length 5.9 cm 2.4 in Volume 1.15 cm 3.7 in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 8 M88A H88A S88A M814A H814A S814A S819A W826A 6 32 M832A H832A S832A W832A S841A S849A W849A M868A H868A S868A - Single Layer Single Layer AL value vs. DC Bias A L (nh/n 2 ) H868A M868A S868A H832A W832A M832A S832A NI(AT) 64 Dongbu Electronic Materials

68 (inch) (mm).9.55 M99A.3 O.D.(max.) Core Dimensions (after Finish) mm.93 in I.D.(min.) mm.527 in HT.(max.) 8.38 mm.33 in Physical Constant Window Area 1.41 cm c.mils Cross Section Area.331 cm 2.51 in 2 Path Length 5.67 cm in Volume 1.88 cm in 3 Core Information Part Number Single Layer Single Layer Perm. AL value (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 9 M99A H99A S99A M919A H919A S919A S925A W935A M943A H943A S943A W943A S954A S965A W965A M99A H99A S99A A L (nh/n 2 ) H99A M99A S99A AL value vs. DC Bias H943A W943A M943A S943A Standard MPC Toroidal Series NI(AT) 65

69 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 24.3 mm.957 in I.D.(min.) mm.542 in HT.(max.) 9.7 mm.382 in.35 Physical Constant Window Area 1.49 cm c.mils M9215A Cross Section Area.388 cm 2.6 in 2 Path Length 5.88 cm in Volume 2.28 cm in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux M9212A H9212A S9212A M9222A H9222A S9222A S923A W9242A 6 51 M9251A H9251A S9251A W9251A S9263A S9276A W9276A M9215A H9215A S9215A - Single Layer Single Layer AL value vs. DC Bias A L (nh/n 2 ) H9215A M9215A S9215A H9251A W9251A M9251A S9251A NI(AT) 66 Dongbu Electronic Materials

70 (inch) (mm) M16157A.44 O.D.(max.) Core Dimensions (after Finish) 27.7 mm 1.91 in I.D.(min.) 14.1 mm.555 in HT.(max.) mm.472 in Physical Constant Window Area 1.56 cm c.mils Cross Section Area.654 cm 2.11 in 2 Path Length 6.35 cm 2.5 in Volume 4.15 cm in 3 Core Information Part Number Single Layer Single Layer Perm. AL value (μ) (nh/n2) MPP High Flux Sendust Power Flux M1618A H1618A S1618A M1632A H1632A S1632A S1645A W1662A M1675A H1675A S1675A W1675A S1694A S16113A W16113A M16157A H16157A S16157A A L (nh/n 2 ) H16157A M16157A S16157A AL value vs. DC Bias H1675A W1675A M1675A S1675A Standard MPC Toroidal Series NI(AT) 67

71 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) mm in I.D.(min.) 19.3 mm.76 in HT.(max.) mm.457 in.42 Physical Constant Window Area 2.93 cm c.mils M13127A Cross Section Area.672 cm 2.14 in 2 Path Length 8.15 cm 3.29 in Volume 5.48 cm in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux M1314A H1314A S1314A M1328A H1328A S1328A S1336A W135A 6 61 M1361A H1361A S1361A W1361A S1376A S1391A W1391A M13127A H13127A S13127A - Single Layer Single Layer AL value vs. DC Bias A L (nh/n 2 ) H13127A M13127A S13127A H1361A W1361A M1361A S1361A NI(AT) 68 Dongbu Electronic Materials

72 (inch) (mm) M13579A.44 O.D.(max.) Core Dimensions (after Finish) 35.1 mm in I.D.(min.) mm.888 in HT.(max.) 9.83 mm.387 in Physical Constant Window Area 4.1 cm c.mils Cross Section Area.454 cm 2.7 in 2 Path Length 8.95 cm in Volume 4.6 cm in 3 Core Information Part Number Single Layer Single Layer Perm. AL value (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 9 M1359A H1359A S1359A M13516A H13516A S13516A S13522A W13531A M13538A H13538A S13538A W13538A S13547A S13557A W13557A M13579A H13579A S13579A A L (nh/n 2 ) H13579A M13579A S13579A AL value vs. DC Bias H13538A W13538A M13538A S13538A Standard MPC Toroidal Series NI(AT) 69

73 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) mm in I.D.(min.) mm.848 in HT.(max.) mm.447 in.412 Physical Constant Window Area 3.64 cm c.mils M141117A Cross Section Area.678 cm 2.15 in 2 Path Length 8.98 cm in Volume 6.88 cm in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux M14113A H14113A S14113A M14124A H14124A S14124A S14133A W14147A 6 56 M14156A H14156A S14156A W14156A S1417A S14184A W14184A M141117A H141117A S141117A - Single Layer Single Layer AL value vs. DC Bias A L (nh/n 2 ) H141117A M141117A S141117A H14156A W14156A M14156A S14156A NI(AT) 7 Dongbu Electronic Materials

74 (inch) (mm) M157168A.57 O.D.(max.) Core Dimensions (after Finish) 4.72mm 1.63 in I.D.(min.) 23.3 mm.917 in HT.(max.) mm.65 in Physical Constant Window Area 4.27 cm c.mils Cross Section Area 1.72 cm in 2 Path Length 9.84 cm in Volume 1.5 cm in 3 Core Information Part Number Single Layer Single Layer Perm. AL value (μ) (nh/n2) MPP High Flux Sendust Power Flux M15719A H15719A S15719A M15735A H15735A S15735A S15748A W15767A M15781A H15781A S15781A W15781A S15711A S157121A W157121A M157168A H157168A S157168A A L (nh/n 2 ) H157168A M157168A S157168A AL value vs. DC Bias H15781A W15781A M15781A S15781A Standard MPC Toroidal Series NI(AT) 71

75 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) mm in I.D.(min.) mm.918 in HT.(max.) mm.745 in.71 Physical Constant Window Area 4.27 cm c.mils M184281A Cross Section Area 1.99 cm 2.38 in 2 Path Length 1.74 cm in Volume 21.3 cm in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux M18432A H18432A S18432A M18459A H18459A S18459A S1848A W184112A M184135A H184135A S184135A W184135A S184169A S18422A W18422A M184281A H184281A S184281A - Single Layer Single Layer AL value vs. DC Bias A L (nh/n 2 ) H184281A M184281A S184281A H184135A W184135A M184135A S184135A NI(AT) 72 Dongbu Electronic Materials

76 (inch) (mm) M184178A.6 O.D.(max.) Core Dimensions (after Finish) 47.63mm in I.D.(min.) mm 1.98 in HT.(max.) mm.635 in Physical Constant Window Area 6.11 cm c.mils Cross Section Area 1.34 cm 2.28 in 2 Path Length cm in Volume cm in 3 Core Information Part Number Single Layer Single Layer Perm. AL value (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 2 M1842A H1842A S1842A M18437A H18437A S18437A S1845A W1847A M18486A H18486A S18486A W18486A S18417A S184128A W184128A M184178A H184178A S184178A A L (nh/n 2 ) H184178A M184178A S184178A AL value vs. DC Bias H18486A W18486A M18486A S18486A Standard MPC Toroidal Series NI(AT) 73

77 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) mm 2.35 in I.D.(min.) 3.94 mm in HT.(max.) mm.565 in.53 Physical Constant Window Area 7.5 cm c.mils M2152A Cross Section Area cm in 2 Path Length cm 5.12 in Volume cm in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux M217A H217A S217A M232A H232A S232A S243A W26A 6 73 M273A H273A S273A W273A S291A S219A W219A M2152A H2152A S2152A - Single Layer Single Layer AL value vs. DC Bias A L (nh/n 2 ) H2152A M2152A S2152A H273A W273A M273A S273A NI(AT) 74 Dongbu Electronic Materials

78 (inch) (mm) M225287A.6 O.D.(max.) Core Dimensions (after Finish) 58. mm in I.D.(min.) 25.6 mm 1.8 in HT.(max.) 16.1 mm.634 in Physical Constant Window Area 5.14 cm c.mils Cross Section Area 2.29 cm in 2 Path Length 12.5 cm in Volume 28.6 cm in 3 Core Information Part Number Single Layer Single Layer Perm. AL value (μ) (nh/n2) MPP High Flux Sendust Power Flux M22532A H22532A S22532A M2256A H2256A S2256A S22581A W225115A M225138A H225138A S225138A W225138A S22572A S22527A W22527A M225287A H225287A S225287A A L (nh/n 2 ) H225287A M225287A S225287A AL value vs. DC Bias H225138A W225138A M225138A S225138A Standard MPC Toroidal Series NI(AT) 75

79 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 58. mm in I.D.(min.) 34.7 mm in HT.(max.) mm.585 in.55 Physical Constant Window Area 9.48 cm c.mils M225156A Cross Section Area cm in 2 Path Length 14.3 cm 5.63 in Volume 2.65 cm in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux M22518A H22518A S22518A M22533A H22533A S22533A S22544A W22562A 6 75 M22575A H22575A S22575A W22575A S22594A S225112A W225112A M225156A H225156A S225156A - Single Layer Single Layer AL value vs. DC Bias A L (nh/n 2 ) H225156A M225156A S225156A H22575A W22575A M22575A S22575A NI(AT) 76 Dongbu Electronic Materials

80 (inch) (mm) Core Dimensions (after Finish) O.D.[max.] 63.1 mm in I.D.[min.] mm in HT.[max] mm 1.34 in.984 Physical Constant Window Area 7.73 cm c.mils M24442A Cross Section Area cm 2.57 in 2 Path Length cm in Volume 52.8 cm in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux W24445A M24484A H24484A S24484A W24484A M244193A H244193A S244193A W244193A M244241A H244241A S244241A W244241A M244289A H244289A S244289A W244289A M24442A H24442A S24442A - Single Layer Single Layer A L (nh/n 2 ) H24442A M24442A S24442A AL value vs. DC Bias H244193A W244193A M244193A Standard MPC Toroidal Series 15 S244193A NI(AT) 77

81 (inch) (mm) M36142A.5 O.D.(max.) Core Dimensions (after Finish) 78.9 mm 3.16 in I.D.(min.) 48.2 mm in HT.(max.) mm.545 in Physical Constant Window Area cm c.mils Cross Section Area cm in 2 Path Length 19.6 cm in Volume 34.7 cm in 3 Core Information Part Number Single Layer Single Layer Perm. AL value (μ) (nh/n2) MPP High Flux Sendust Power Flux M3616A H3616A S3616A M363A H363A S363A S3639A W3656A M3668A H3668A S3668A W3668A S3684A S3612A W3612A M36142A H36142A S36142A AL value vs. DC Bias A L (nh/n 2 ) H36142A M36142A S36142A H3668A W3668A M3668A S3668A NI(AT) 78 Dongbu Electronic Materials

82 (inch) (mm) Core Dimensions (after Finish) O.D.(max.) 78.9 mm 3.16 in I.D.(min.) 48.2 mm in HT.(max.) 17.2 mm.67 in.625 Physical Constant Window Area cm c.mils M36178A Cross Section Area 2.27 cm in 2 Path Length 19.6 cm in Volume 45.3 cm in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux 14 2 M362A H362A S362A M3637A H3637A S3637A S365A W3671A 6 85 M3685A H3685A S3685A W3685A S3617A S36128A W36128A M36178A H36178A S36178A - Single Layer Single Layer A L (nh/n 2 ) H36178A M36178A S36178A AL value vs. DC Bias H3685A W3685A M3685A S3685A Standard MPC Toroidal Series NI(AT) 79

83 (inch) (mm) M492A.535 O.D.(max.) Core Dimensions (after Finish) mm 4.5 in I.D.(min.) mm in HT.(max.) mm.585 in Physical Constant Window Area cm c.mils Cross Section Area 2.97 cm 2.46 in 2 Path Length cm in Volume cm in 3 Core Information Part Number Single Layer Single Layer Perm. AL value (μ) (nh/n2) MPP High Flux Sendust Power Flux M421A H421A S421A M44A H44A S44A S454A W477A M492A H492A S492A W492A AL value vs. DC Bias A L (nh/n 2 ) H492A W492A M492A S492A NI(AT) 8 Dongbu Electronic Materials

84 (inch) (mm) M4112A.65 O.D.(max.) Core Dimensions (after Finish) mm 4.5 in I.D.(min.) mm in HT.(max.) 19.4 mm.75 in Physical Constant Window Area cm c.mils Cross Section Area 3.52 cm 2.546in 2 Path Length cm in Volume 85.5 cm in 3 Core Information Perm. AL value Part Number (μ) (nh/n2) MPP High Flux Sendust Power Flux M425A H425A S425A M447A H447A S447A S463A W49A M4112A H4112A S4112A W4112A Single Layer Single Layer A L (nh/n 2 ) AL value vs. DC Bias H4112A W4112A M4112A S4112A Standard MPC Toroidal Series NI(AT) 81

85 Special Core Data Special Height Up/Down Core Series Introduction (3.56mm x 1.78mm x 1.52mm).14.7 Increase H.T.(mm).6 Decrease H.T.(mm) We, Dongbu have made special height up / down core series since 2. Actually so many customers would like to get some increasing height cores or decreasing height cores in order to design their drawing. So we have supplied various special height core series. That is say, we can make various core height depending on customer request. Also in addition to cores listed below(see [Table 1]), customer specifications are available. It is very useful in the case of replacing two pieces core by one cores which is the increasing height core. As increasing height, customer can get cores low prices and also we can get much profits than common cores. Available Item As we refered to Introduction, we have various special height core series. If you would like to know further listed, please see next page. For convenience, We listed goods now we can supply at once the [Table 1]. So if you would like to get any samples or inquiries for other item that don t list by [Table 1] We are willing to assist you. If you need to get other information about it, Please contact to us. 82 Dongbu Electronic Materials

86 [ Table 1 ] Part Number Permeability AL-Value Magnetic Path length Cross Section Area Core Dimension OD(max.) ID(min.) HT(max.) (μ) (nh/n 2 ) (cm) (cm 2 ) (mm) (mm) (mm) H655A M6867A S1688A H1695A S1695A S16146A S1621A H16191A H16115A S16115A S16251A H131A S131A H141149A M141168A H1574A H15784A Above mentioned dimensions are for nominal epoxy coating Finish coating material : Epoxy (UL94V - ) Inductance tolerance are + - 8% from nominal inductance In addition to cores listed above, customer specifications are also available 83

87 Special Sendust 9μ Core Series OD ID Features 1. Low Core Losses HT 2. Excellent DC - Bias Characteristics 3. Excellent Frequency Characteristics 4. Low Price Part Number Permeability AL-Value Magnetic Path length Cross Section Area Core Dimension OD(max.) ID(min.) HT(max.) (μ) (nh/n 2 ) (cm) (cm 2 ) (mm) (mm) (mm) S4155A S546A S77A S827A S8212A S847A S199A S1915A S136146A S136183A Above mentioned core dimensions are for nominal bare core before coating Cores are supplied with.4mm~.6mm nominal epoxy coating. Finish coating material : Epoxy(UL94V-), All core colors are black Inductance tolerance are + - 8% from nominal inductance In addition to cores listed above, customer specifications are also available 84 Dongbu Electronic Materials

88 Dongbu Special Shape Core Data High Flux Sendust Special Shape Core Series Power Flux Features 1. Large energy storage capacity 2. Low core losses at elevated frequency 3. Exellent DC-Bias inductance features 4. Good temperature stability Applications 1. Choke coils for large current 2. Flyback transformers 3. PFC reactors 4. High inductance choke coils Special Core Data 85

89 E-Core series Identification of Dongbu Sendust E-Core Series S EE Core shape Inductance Size Size Material : EE means EE type cores : apparent inductance [mh] factor for 1turns : horizontal axis of cores [mm] : vertical axis of cores [mm] : material code Where, S : Sendust Material [Fe / Al / Si] 43 : 43 mm 17 : 17mm 234 : 234mH at 1turns EE : 'EE' shape cores. In the case of 'ER'. It means 'ER' shaped cores Dimension specification of Dongbu Sendust E-Core series [Fig. 1] mechanical out lines [unit : mm] about sendust E-core series B C L A F M E D [Table 2] shows our dimension specification of sendust E-core series P/N *198***EE *251***EE *3514***EE *4117***EE *4321***EE *5528***EE *6533***EE *7228***EE *838***EE A ±.3 ±.18 ± ±.38 ±.18 ± ±.5 ±.23 ± ±.69 ±.279 ± ±.64 ±.33 ± ±.812 ±.46 ± ±1.27 ±.38 ± ±1.9 ±.51 ± ±1.19 ±.64 ±.38 Dimensions [mm] B C D E F L M ± ± ± ± ± ± ± ± ±.38 Path Length (cm) Cross section Area (cm 2 ) AL value(nh/n 2 )±12% 26μ 4μ 6μ 9μ NA NA NA NA 86 Dongbu Electronic Materials

90 Block-Core series Identification of Dongbu Block-Core Series W 6315 E Permeability Size Material : E(9μ), C(6μ), J(4μ) : Length Width Height [mm] : material code Where, W : Power Flux Material [Fe / Si] 6315 : 6mm(L) 3mm(W) 15mm(H) E : 9μ Dimension specification of Dongbu Block-Core series [Fig. 1] mechanical out lines [unit : mm] about Block-core series C A B [Table 2] shows our dimension specification of Block-core series P/N Assembled (4pcs) Assembled Dimensions (mm) L W H AL Value(nH/N 2 ) 4μ 6μ Path Length (cm) Crosssection Area (cm 2 ) *5315* *532* *6315* H *632* *7315* *732* *8315* *832* L W 87

91 U-Core series Identification of Dongbu Sendust U-Core Series S UU Core shape Inductance Size Size Material : UU means UU type cores : apparent inductance [mh] factor for 1turns : horizontal axis of cores [mm] : vertical axis of cores [mm] : material code Where, S : Sendust Material [Fe / Al / Si] 55 : 55 mm 29 : 29mm 234 : 234mH at 1turns UU : 'UU' shape cores. In the case of 'UU'. It means 'UU' shaped cores Dimension specification of Dongbu Sendust U-Core series [Fig. 1] mechanical out lines [unit : mm] about sendust U-core series B C L A E D [Table 2] shows our dimension specification of sendust U-core series P/N *3111***UU *4111***UU *5528***UU *6533***UU *6533***UU *7236***UU *838***UU A B ±.51 ±.25 ± ±.51 ±.51 ± ±.51 ±.51 ± ±1.35 ±.31 ± ±1.35 ±.31 ± ±.89 ±.64 ± ±89 ±.64 ±.38 Dimensions [mm] C D (min.) E (min.) L (nom.) Path Length (cm) Cross section Area (cm 2 ) AL value(nh/n 2 )±12% 26μ 4μ 6μ 9μ Dongbu Electronic Materials