Buck Solution_20W LED Driver for T8 LD7835_T8_20W_R00_TEST. Key Features

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1 Subject LD7835 T8 Demo Board Manual Model Name LD7835_20W_R00_TEST (60V/300mA) Key Features Buck Topology Current Ripple Reduction (CRR) Current Accuracy < 5% Single Stage PFC > Normal Line Efficiency > 92% LED Short / Open protection Meet EN55015 EMI Test - Conduction Meet IEC Surge Test 1

2 Lighting Power Design Check List MODEL NAME LD7835_T8_DB-00.a TOTAL PAGE: 23(Page) P.M. Scott Lin DATE: 2014(Y)/ 06(M)/ 09(D) NO. TEST ITEM SPEC. NAME. PAGE RESULT 1 Input Characteristics - Efficiency >88% Leo 10 ~ 10 PASS 2 Input Characteristics - Power Factor >0.9 Leo 11 ~ 11 PASS 3 Input Characteristics - THD of Input Current TBD Leo 12 ~ 12 NA 4 Output Characteristics - Current Regulation <5% Leo 13 ~ 13 PASS Output Characteristics 5 TBD Leo 14 ~ 14 NA Current Ripple & Voltage Ripple ( - ) 6 LED Turn On Time TBD Leo 15 ~ 15 NA 7 Abnormal Test - LED Open Voltage Test <100V Leo 15 ~ 15 PASS 8 Abnormal Test - LED Short Dissipation Test <0.5W Leo 16 ~ 16 PASS 9 Abnormal Test - Over Temp. Protection Test Function Leo 16 ~ 16 PASS 10 AC On/Off Test TBD Leo 19 ~ 19 NA 11 EMI Test - Conduction 12 EMS Test - Surge Meet EN55015 Meet EN Leo 21 ~ 22 PASS Leo 23 ~ 23 PASS 13 Thermal Test <100 o C Leo 24 ~ 24 PASS 2

3 Contents Index 1.LED DRIVER MODULE SPECIFICATION INPUT CONDITION OUTPUT CONDITION PROTECTION CONDITION AMBIENT TEMPERATURE LED DRIVER APPLICATION CIRCUIT SCHEMATIC BOM LIST PCB GERBER FILE INDUCTOR SPECIFICATION EXECUTIVE SUMMARY INPUT CHARACTERISTICS Efficiency and Power Factor THD of Input Current OUTPUT CHARACTERISTICS Current Regulation Current Ripple & Voltage Ripple TURN-ON TIME ABNORMAL TEST LED Open Voltage Test LED Short Dissipation Test Over Temp. Protection Test MOSFET VOLTAGE AND INDUCTOR CURRENT WAVEFORMS AC ON/OFF TEST EMI TEST SURGE TEST THERMAL TEST

4 Table Index Table LED Load = 63V... 9 Table 2 THD of Input Current Table 3 Output Current Regulation Table 4 Current Ripple LED Load = 63V Table 5 Voltage Ripple LED Load = 63V Table 6 Turn On Time Table 7 Over Voltage Level Table 8 Input Power during LED short Table 9 Turn on time Table 10 Surge Test Table 11 Thermal Test Figure Index Fig. 1 Vac vs. Efficiency... 9 Fig. 2 Vac vs. THD Fig. 3 Start-up 90Vac/60Hz Fig. 4 Start-up 115Vac/60Hz Fig. 5 Start-up 230Vac/50Hz Fig. 6 Start-up 264Vac/50Hz Fig. 7 LED Open 90Vac/60Hz Fig. 8 LED Open 13 Fig. 9 LED Short 90Vac/60Hz Fig. 10 LED Short 264Vac/50Hz Fig. 11 Over Temp. 90Vac/60Hz Fig. 12 Over Temp. 264Vac/60Hz Fig. 13 Drain & I L 90Vac/60Hz Fig. 14 Drain & I L 90Vac/60Hz/Zoom-In Fig. 15 Drain & I L 115Vac/60Hz Fig. 16 Drain & I L 115Vac/60Hz/Zoom-In Fig. 17 Drain & I L 230Vac/60Hz Fig. 18 Drain & I L 230Vac/60Hz/Zoom-In Fig. 19 Drain & I L 264Vac/60Hz Fig. 20 Drain & I L 264Vac/60Hz/Zoom-In Fig. 21 AC On/Off 90Vac/60Hz Fig. 22 AC On/Off 264Vac/50Hz Fig VAC Line EMI test Fig VAC Neutral EMI test Fig VAC Line EMI test Fig VAC Neutral EMI test Fig VAC Vertical test Fig VAC Horizontal test Fig VAC Vertical test Fig VAC Horizontal test

5 1. LED Driver Module Specification 1.1. Input Condition AC Input Voltage : 90VAC ~ 264VAC AC Input Frequency : 47Hz ~ 63Hz 1.2. Output Condition Output Voltage : 63V (20 pcs LED) Output Current : Typical 300mA 1.3. Protection Condition LED Open Protection Auto-recovery, Hiccup 1 times LED short Protection Auto-recovery, Hiccup 1 times Over Current Protection Cycle-by-cycle limit Over Temp. Protection Auto-recovery, Hiccup 1 time 1.4. Ambient Temperature Ambient Temperature 25 o C 5

6 2. LED Driver Application Circuit 2.1. Schematic 6

7 2.2. BOM List P/N Component Value Note RL1 4.7kΩ,1206, ±5% YAGEO RL2 4.7kΩ,1206, ±5% YAGEO R1 0Ω,0603, 5% YAGEO R2 300KΩ, 1206, ±5% YAGEO R3 Bead YAGEO R4 Bead YAGEO R5 300KΩ,0805, 1% YAGEO R6 2.7,1206, ±1% YAGEO R7 0Ω, 0805, 5% YAGEO R8 2.7,1206, ±1% YAGEO R9 51Ω,0805, 1% YAGEO R12 1KΩ,0805, ±5% YAGEO R14 100KΩ,0805, ±5% YAGEO R18 4.7Ω,0805, ±5% YAGEO R19 182kΩ,0805, ±5% YAGEO R20 182kΩ,0805, ±5% YAGEO R101 82kΩ,0805, ±5% YAGEO L1 L2 L3 2mH MAG. laters MCD KU 2mH MAG. laters MCD KU 2mH MAG. laters MCD KU L4 DR10*16/0.7mH Murata P/N Component Value Note C1 154/450V, X7T NA C2 33pF, 1kV, 0603 NA C3 100uF, 100V, E-cap KYS C4 100uF, 100V, E-cap KYS C5 1uF, 10V, 0603 YAGEO C7 NC NA C8 4.7uF, 10V, 1206 YAGEO C9 0.1uF/50V/0603 YAGEO C10 0.1uF/50V/0603 YAGEO CX1 0.1uF/300V/X-cap CTX D1 TB8S Panjit D2 ER2J/600V/2A Panjit D3 SCDS105/SOD-123 Panjit D4 18V/Zener NA D5 IN4148 NA Z1 7D471 NA Z2 7D471 NA F1 1A/250V Fuse Walter Q1 4A/600V PO460AI Niko-sem Q2 MMBT3904 NA IC1 LD7835 Leadtrend 7

8 2.3. PCB Gerber File TOP VIEW BOTTOM VIEW 2.4. Inductor Specification 8

9 3. Executive Summary Test Equipment Equipment Equipment Model No. Electrical Load Chroma Power Meter WT210 AC power source Chroma Scope TDS3014 Multi-function Meter Fluke 187 Thermal Hunter PT-3S 3.1. Input Characteristics Efficiency and Power Factor Specification Judgment >88% PASS P in I o V o Efficiency PF (W) (ma) (V) 90Vac/60Hz % Vac/60Hz % Vac/50Hz % Vac/50Hz % Table LED Load = 63V Fig. 1 Vac vs. Efficiency 9

10 Fig. 2 Vac vs. Power Factor THD of Input Current Specification NA Judgment NA THD (%) 90Vac/60Hz 115Vac/60Hz 230Vac/50Hz 264Vac/50Hz Table 2 THD of Input Current Fig. 2 Vac vs. THD 10

11 3.2. Output Characteristics Current Regulation Specification Judgment <5% PASS Io(mA) 90Vac/ 60Hz 115Vac/ 60Hz 230Vac/ 50Hz 264Vac/ 50Hz Current Regulation (%) % Table 3 Output Current Regulation LED Reg% = (Max-Min)/ (Max+Min) = 1.32% Current Ripple & Voltage Ripple Definition of Current Ripple (%): I PK-PK / I o * 100 CR(%) 90Vac/ 60Hz 115Vac/ 60Hz 230Vac/ 50Hz 264Vac/ 60Hz I o (ma) I PK-PK (ma) CR(%) 81.29% 72.54% 79.47% 79.47% Table 4 Current Ripple LED Load = 63V CR(%) 90Vac/ 60Hz 115Vac/ 60Hz 230Vac/ 50Hz 264Vac/ 60Hz V o (V) V PK-PK (V) VR(%) 3.67% 2.22% 4.88% 6.40% Table 5 Voltage Ripple LED Load = 63V Note: Current ripple depends on output capacitance. If the need of CR(%) < 50%, the capacitance must be greater than 220uF and enable CRR function in this case. 11

12 3.3. Turn-On Time Turn-On Time (ms) 90Vac/60Hz 115Vac/60Hz 230Vac/50Hz 264Vac/50Hz Table 6 Turn On Time Fig. 3 Start-up 90Vac/60Hz CH1:V ac, CH3:I o Fig. 4 Start-up 115Vac/60Hz CH1:V ac, CH3:I o Fig. 5 Start-up 230Vac/50Hz CH1:V ac, CH3:I o Fig. 6 Start-up 264Vac/50Hz CH1:V ac, CH3:I o 12

13 3.4. Abnormal Test LED Open Voltage Test Specification Not damage, No smoking, No fire Judgment PASS Input Voltage 90VAC/60Hz 264VAC/50Hz Output Voltage Table 7 Over Voltage Level Fig. 7 LED Open 90Vac/60Hz CH1: V CC, CH2:Gate, CH4:Vout Fig. 8 LED Open CH1: V CC, CH2:Gate, CH4:Vout 13

14 LED Short Dissipation Test Specification Not damage, No smoking, No fire Judgment PASS Input Voltage 90VAC/60Hz 264VAC/50Hz Input Power Table 8 Input Power during LED short Fig. 9 LED Short 90Vac/60Hz CH1: V CC, CH2:Gate, CH3:I L Fig. 10 LED Short 264Vac/50Hz CH1: V CC, CH2:Gate, CH3:I L 14

15 Over Temp. Protection Test Specification Not damage, No smoking, No fire Judgment PASS Fig. 11 Over Temp. 90Vac/60Hz CH1: V CC, CH2:Gate, CH4:Vout Fig. 12 Over Temp. 264Vac/60Hz CH1: V CC, CH2:Gate, CH4:Vout 15

16 3.5. MOSFET Voltage and Inductor Current Waveforms Fig. 13 Drain & I L 90Vac/60Hz CH2: Drain, CH3: I L Fig. 14 Drain & I L 90Vac/60Hz/Zoom-In CH2: Drain, CH3: I L Fig. 15 Drain & I L 115Vac/60Hz CH2: Drain, CH3: I L Fig. 16 Drain & I L 115Vac/60Hz/Zoom-In CH2: Drain, CH3: I L Fig. 17 Drain & I L 230Vac/60Hz CH2: Drain, CH3: I L Fig. 18 Drain & I L 230Vac/60Hz/Zoom-In CH2: Drain, CH3: I L 16

17 Fig. 19 Drain & I L 264Vac/60Hz CH2: Drain, CH3: I L Fig. 20 Drain & I L 264Vac/60Hz/Zoom-In CH2: Drain, CH3: I L 3.6. AC On/Off Test Specification NA Judgment NA Input Voltage 90VAC/60Hz 264VAC/50Hz LED Turn on 144mS 40mS Table 9 Turn on time Power On: 500ms & Power Off 500ms Fig. 21 AC On/Off 90Vac/60Hz CH2: Drain, CH3:Io, CH4:V AC Fig. 22 AC On/Off 264Vac/50Hz CH2: Drain, CH3:Io, CH4:V AC Note: The voltage spike of MOSFET is induced from inrush current at power on instantaneously. It s easy to be observed while phase of AC input is 90 o or 270 o. 17

18 3.7. EMI Test CE: Conduction environment Specification Meet EN55015, < 3db Judgment PASS Fig VAC Line EMI test Fig VAC Neutral EMI test 18

19 Fig VAC Line EMI test Fig VAC Neutral EMI test 19

20 RE: Radiatied Emission Fig VAC Vertical test Fig VAC Horizontal test 20

21 Fig VAC Vertical test Fig VAC Horizontal test 21

22 3.8. Surge Test Specification Meet IEC Judgment PASS EUT Line: 220Vac 2PIN 3PIN System Spec.: 24V/ 0.7A Waveform 1.2/50 10/700 Ring Impedance 12ohm 2ohm Repetition Once each 20 second period with 5 transients per test NOTE: LD7835 Real Demo Board Test Mode Phase & Level (V) Test Result L/N K -0.5K K -0.5K PASS PASS NOTE: Table 10 Surge Test 3.9. Thermal Test Specification(Ambient:25 ) Judgment < 100 o C PASS No. Location Max. Rating(.) 90V/60Hz 115V/60Hz(.) 230V/50Hz(.) 264/50Hz(.) (.) Derating (.) Derating (.) Derating (.) Derating 1 L % % % % 2 Q % % % % 3 C % % % % 4 C % % % % 5 IC % % % % 6 D % % % % Table 11 Thermal Test 22