516(5,(6. PWM/VFM step-down DC/DC Converter
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- Ἀνίκητος Σπανού
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1 PWM/VFM step-down DC/DC Converter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a9 %XLOWLQ6RIWVWDUW)XQFWLRQDQG3URWHFWLRQ)XQFWLRQ5HVHWW\SHSURWHFWLRQ 7KUHHRSWLRQVRI2VFLOODWRU)UHTXHQF\ N+]N+]N+] +LJK(IILFLHQF\ 7\S 2XWSXW9ROWDJH 6WHSZLVH6HWWLQJZLWKDVWHSRI9LQWKHUDQJHRI9 WR9DVIL[HGYROWDJHW\SH5HIHUHQFH9ROWDJHRI$GMXVW DEOH7\SHLV9 6WDQGE\&XUUHQW 7\S $ +LJK$FFXUDF\2XWSXW9ROWDJH /RZ7HPSHUDWXUH'ULIW&RHIILFLHQWRI2XWSXW9ROWDJH 7\S SSPƒ& APPLICATIONS 3RZHUVRXUFHIRUKDQGKHOGFRPPXQLFDWLRQHTXLSPHQWFDPHUDVYLGHRLQVWUXPHQWVVXFKDV9&5VFDPFRUGHUV 3RZHUVRXUFHIRUEDWWHU\SRZHUHGHTXLSPHQW 3RZHUVRXUFHIRUKRXVHKROGHOHFWULFDODSSOLDQFHV 1
2 + - R1224N BLOCK DIAGRAM *Fixed Output Voltage Type VIN OSC VOUT EXT Amp + Vref PWM/VFM CONTROL Protection Soft Start Chip Enable CE UVLO + - Vref GND *Adjustable Output Voltage Type VIN OSC VFB EXT Amp + Vref Soft Start Protection Chip Enable CE UVLO + - Vref GND 2
3 SELECTION GUIDE,QWKH516HULHVWKHRXWSXWYROWDJHWKHRVFLOODWRUIUHTXHQF\WKHRSWLRQDOIXQFWLRQDQGWKHWDSLQJW\SHIRUWKH,&VFDQEHVHOHFWHGDWWKHXVHUVUHTXHVW 7KHVHOHFWLRQFDQEHPDGHZLWKGHVLJQDWLQJWKHSDUWQXPEHUDVVKRZQEHORZ 51[[[75 DEF 3DUW1XPEHU Code D E F Contents 6HWWLQJ2XWSXW9ROWDJH9287 6WHSZLVHVHWWLQJZLWKDVWHSRI9LQWKHUDQJHRI9WR9LVSRVVLEOH $GMXVWDEOHW\SHD PHDQV5HIHUHQFHYROWDJH 92SWLRQDO)XQFWLRQLV*+ 'HVLJQDWLRQRI2VFLOODWRU)UHTXHQF\ IL[HG 'HVLJQDWLRQRI2SWLRQDO)XQFWLRQ ( N+]ZLWKD3:9)DOWHUQDWLYHFLUFXLW ) N+]ZLWKD3:9)DOWHUQDWLYHFLUFXLW * N+]ZLWKRXWD3:9)DOWHUQDWLYHFLUFXLW + N+]ZLWKRXWD3:9)DOWHUQDWLYHFLUFXLW / N+]ZLWKD3:9)DOWHUQDWLYHFLUFXLW N+]ZLWKRXWD3:9)DOWHUQDWLYHFLUFXLW 3
4 PIN CONFIGURATION 5 SOT VIN EXT (mark side) VOUT CE GND (VFB) PIN DESCRIPTION Pin No. Symbol Description &( &KLS(QDEOH3LQ$FWLYHZLWK +µ *1' *URXQG3LQ 92879)% 3LQIRURQLWRULQJ2XWSXW9ROWDJH)HHGEDFN9ROWDJH (;7 ([WHUQDO7UDQVLVWRU'ULYH3LQ&262XWSXW 9,1 3RZHU6XSSO\3LQ ABSOLUTE MAXIMUM RATINGS *1' 9 Symbol Item Rating Unit 9,1 9,16XSSO\9ROWDJH 9 9(;7 (;73LQ2XWSXW9ROWDJH a9,1 9 9&( &(3LQ,QSXW9ROWDJH a9, )% 92879)%3LQ,QSXW9ROWDJH a9,1 9,(;7 (;73LQ,QGXFWRU'ULYH2XWSXW&XUUHQW P$ 3' 3RZHU'LVVLSDWLRQ P: 7RSW 2SHUDWLQJ7HPSHUDWXUH5DQJH a ƒ& 7VWJ 6WRUDJH7HPSHUDWXUH5DQJH a ƒ& 4
5 ELECTRICAL CHARACTERISTICS R1224Nxx2X (X=E/F/G/H/L/M) except R1224N12X 7RSW ƒ& Symbol Item Conditions Min. Typ. Max. Unit 9,1 2SHUDWLQJ,QSXW9ROWDJH WHSGRZQ2XWSXW9ROWDJH 9,1 9&( 96(79,287 P$ :KHQ96(7 99,1 9&( 9 96(7 96(7 96( WHSGRZQ2XWSXW9ROWDJH 7HPSHUDWXUH&RHIILFLHQW ƒ& 7RSW ƒ& SSP ƒ& IRVF 2VFLOODWRU)UHTXHQF\ 9,1 9&( 96(79,287 P$ :KHQ96(7 9,1 9&( 9 /YHUVLRQ (*YHUVLRQ )+YHUVLRQ N+] I26& 7 2VFLOODWRU)UHTXHQF\ 7HPSHUDWXUH&RHIILFLHQW ƒ& 7RSW ƒ& ƒ&,'' 6XSSO\&XUUHQW 9,1 9&( ()/YHUVLRQ *YHUVLRQ +YHUVLRQ $,VWE 6WDQGE\&XUUHQW 9,1 99&( $,(;7+ (;7 +µ2xwsxw&xuuhqw,(;7/ (;7 /µ2xwsxw&xuuhqw 9,1 99(; &( 9 9,1 99(; &( 9 P$ P$,&(+ &( +µ,qsxw&xuuhqw 9,1 9&( $,&(/ &( /µ,qsxw&xuuhqw 9, &( 9 $ 9&(+ &( +µ,qsxw9rowdjh 9, &(/ &( /µ,qsxw9rowdjh 9, D[GW\ 2VFLOODWRUD[LPXP'XW\&\FOH 9)GW\ 9)'XW\&\FOH ()/YHUVLRQ 989/2 89/29ROWDJH 9,1 9&( 9WR /2 89/25HOHDVH9ROWDJH 9,1 9&( 9WR /2 9 7VWDUW 'HOD\7LPHE\6RIW6WDUWIXQFWLRQ 9,1 96(79,287 P$ 9&( 9 96(79 PV 7SURW 'HOD\7LPHIRUSURWHFWLRQFLUFXLW 9,1 9&( 96( (79 9 PV 5
6 R1224N12X (X=G/H/M) 7RSW ƒ& Symbol Item Conditions Min. Typ. Max. Unit 9,1 2SHUDWLQJ,QSXW9ROWDJH 9 9)% )HHGEDFN9ROWDJH 9,1 9&( 9,)% P$ 9 9)% 7 )HHGEDFN9ROWDJH 7HPSHUDWXUH&RHIILFLHQW ƒ& 7RSW ƒ& SSP ƒ& IRVF 2VFLOODWRU)UHTXHQF\ 9,1 9&( 9,)% P$ YHUVLRQ *YHUVLRQ +YHUVLRQ N+] I26& 7 2VFLOODWRU)UHTXHQF\ 7HPSHUDWXUH&RHIILFLHQW ƒ& 7RSW ƒ& ƒ&,'' 6XSSO\&XUUHQW 9,1 9&( 9)% 9 YHUVLRQ *YHUVLRQ +YHUVLRQ $,VWE 6WDQGE\&XUUHQW 9,1 99&( 99)% 9 $,(;7+ (;7 +µ2xwsxw&xuuhqw,(;7/ (;7 /µ2xwsxw&xuuhqw 9,1 99(;7 99)% 9 9&( 9 9,1 99(;7 99)% 9 9&( 9 P$ P$,&(+ &( +µ,qsxw&xuuhqw 9,1 9&( 9)% 9 $,&(/ &( /µ,qsxw&xuuhqw 9,1 9)% 99&( 9 $ 9&(+ &( +µ,qsxw9rowdjh 9,1 99)% 9 9 9&(/ &( /µ,qsxw9rowdjh 9,1 99)% 9 9 D[GW\ 2VFLOODWRUD[LPXP'XW\&\FOH 989/2 89/29ROWDJH 9,1 9&( 9WR99)% /2 89/25HOHDVH9ROWDJH 9,1 9&( 9WR99)% 9 989/2 9 7VWDUW 'HOD\7LPHE\6RIW6WDUWIXQFWLRQ 9,1 9,)% P$ 9&( 9 9 PV 7SURW 'HOD\7LPHIRUSURWHFWLRQFLUFXLW 9,1 9&( 9 9)% 9 9 PV 6
7 TYPICAL APPLICATION AND APPLICATION HINTS (1) Fixed Output Voltage Type (R1224Nxx2E/F/G/H/L/M except xx=1) L PMOS R1 C1 C2 VIN CE EXT GND VOUT SD + - C3 LOAD CE CONTROL 326 +$7+LWDFKL / &5&6XPLGD + 6' 5%/5RKP & )7DQWDOXP7\SH & )&HUDPLF7\SH & )&HUDPLF7\SH 5 Ω (2) Adjustable Output Type (R1224N12G/H/M) Example: Output Voltage=3.2V L R1 + - C1 C2 VIN CE EXT GND PMOS VFB SD R4 R2 C4 R3 + - C3 LOAD CE CONTROL 326 +$7+LWDFKL / &5&6XPLGD + 6' 5%/5RKP & )7DQWDOXP7\SH & )&HUDPLF7\SH & )&HUDPLF7\SH & S)&HUDPLF7\SH 5 Ω5 NΩ5 NΩ5 NΩ :KHQ\RXXVHWKHVH,&VFRQVLGHUWKHIROORZLQJLVVXHV $VVKRZQLQWKHEORFNGLDJUDPDSDUDVLWLFGLRGHLVIRUPHGLQHDFKWHUPLQDOHDFKRIWKHVHGLRGHVLVQRWIRUPHGIRU ORDGFXUUHQWWKHUHIRUHGRQRWXVHLWLQVXFKDZD\:KHQ\RXFRQWUROWKH&(SLQE\DQRWKHUSRZHUVXSSO\GRQRW PDNHLWV +µohyhopruhwkdqwkhyrowdjhohyhori9,1slq 7
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
9 How to Adjust Output Voltage and about Phase Compensation $VIRU$GMXVWDEOH2XWSXWW\SHIHHGEDFNSLQ9)%YROWDJHLVFRQWUROOHGWRPDLQWDLQ9 2XWSXW9ROWDJH9287LVDVIROORZLQJHTXDWLRQ )% )% 555 7KXVZLWKFKDQJLQJWKHYDOXHRI5DQG5RXWSXWYROWDJHFDQEHVHWLQWKHVSHFLILHGUDQJH,QWKH'&'&FRQYHUWHUZLWKWKHORDGFXUUHQWDQGH[WHUQDOFRPSRQHQWVVXFKDV/DQG&SKDVHPLJKWEHEHKLQG GHJUHH,Q WKLV FDVH WKH SKDVHPDUJLQ RI WKH V\VWHPZLOO EH OHVV DQG VWDELOLW\ZLOOEHZRUVH 7R SUHYHQW WKLV SKDVH PDUJLQVKRXOGEHVHFXUHGZLWKSURFHHGLQJWKHSKDVH$SROHLVIRUPHGZLWKH[WHUQDOFRPSRQHQWV/DQG& )SROHaπ / & $]HURVLJQDOEDFNWR]HURLVIRUPHGZLWK5DQG& )]HURaπ 5 & )RUH[DPSOHLI/ +& )WKHFXWRIIIUHTXHQF\RIWKHSROHLVDSSUR[LPDWHO\N+] 7RPDNHWKHFXWRIIIUHTXHQF\RIWKHSROHDVPXFKDVN+]VHW5 NΩDQG& S),I9287LVVHWDW95 NΩLVDSSURSULDWH 5SUHYHQWVIHHGEDFNRIWKHQRLVHWR9)%SLQDERXWNΩLVDSSURSULDWHYDOXH L R1 + - C1 C2 VIN CE EXT GND PMOS VFB SD R4 R2 C4 R3 + - C3 LOAD CE CONTROL 9
10 OPERATION of step-down DC/DC converter and Output Current 7KHVWHSGRZQ'&'&FRQYHUWHUFKDUJHVHQHUJ\LQWKHLQGXFWRUZKHQ/[WUDQVLVWRULV21DQGGLVFKDUJHVWKHHQHUJ\ IURPWKHLQGXFWRUZKHQ/[WUDQVLVWRULV2))DQGFRQWUROVZLWKOHVVHQHUJ\ORVVVRWKDWDORZHURXWSXWYROWDJHWKDQWKH LQSXWYROWDJHLVREWDLQHG7KHRSHUDWLRQZLOOEHH[SODLQHGZLWKUHIHUHQFHWRWKHIROORZLQJGLDJUDPV <Basic Circuits> <Current through L> IL i1 ILmax IOUT VIN Lx Tr L i2 VOUT ILmin topen SD CL ton T=1/fosc toff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
11 Discontinuous Conduction Mode and Continuous Conduction Mode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
12 OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS :KHQ/[7ULV21 :KHUHLQ5LSSOH&XUUHQW33YDOXHLVGHVFULEHGDV,5321UHVLVWDQFHRI/[7ULVGHVFULEHGDV5SWKHGLUHFWFXUUHQWRI WKHLQGXFWRULVGHVFULEHGDV5/ 9, S5/,287/,53WRQ (TXDWLRQ :KHQ/[7ULV2)) /,53WRII 9)92875/,287(TXDWLRQ 3XW(TXDWLRQWR(TXDWLRQDQGVROYHIRU21GXW\WRQWRIIWRQ '21 ' )5/,2879,19)5S,287 (TXDWLRQ 5LSSOH&XUUHQWLVDVIROORZV,53 9,192875S,2875/,287 '21I/(TXDWLRQ :KHUHLQSHDNFXUUHQWWKDWIORZVWKURXJK//[7UDQG6'LVDVIROORZV,/PD[,287,53 (TXDWLRQ &RQVLGHU,/PD[FRQGLWLRQRILQSXWDQGRXWSXWDQGVHOHFWH[WHUQDOFRPSRQHQWV 7KHDERYHH[SODQDWLRQLVGLUHFWHGWRWKHFDOFXODWLRQLQDQLGHDOFDVHLQFRQWLQXRXVPRGH 12
13 External Components 1. Inductor 6HOHFWDQLQGXFWRUWKDWSHDNFXUUHQWGRHVQRWH[FHHG,/PD[,IODUJHUFXUUHQWWKDQDOORZDEOHFXUUHQWIORZVPDJ QHWLFVDWXUDWLRQRFFXUVDQGPDNHWUDQVIRUPHIILFLHQF\ZRUVH :KHQWKHORDGFXUUHQWLVGHILQLWHWKHVPDOOHUYDOXHRI/WKHODUJHUWKHULSSOHFXUUHQW 3URYLGHGWKDWWKHDOORZDEOHFXUUHQWLVODUJHLQWKDWFDVHDQG'&FXUUHQWLVVPDOOWKHUHIRUHIRUODUJHRXWSXWFXU UHQWHIILFLHQF\LVEHWWHUWKDQXVLQJDQLQGXFWRUZLWKDODUJHYDOXHRI/DQGYLFHYHUVD 2. Diode 8VHDGLRGHZLWKORZ9)6FKRWWN\W\SHLVUHFRPPHQGHGDQGKLJKVZLWFKLQJVSHHG 5HYHUVHYROWDJHUDWLQJVKRXOGEHPRUHWKDQ9,1DQGFXUUHQWUDWLQJVKRXOGEHHTXDORUPRUHWKDQ,/PD[ 3. Capacitors $VIRU&,1XVHDFDSDFLWRUZLWKORZ(65(TXLYDOHQW6HULHV5HVLVWDQFHDQGDFDSDFLW\RIDWOHDVW )IRUVWDEOH RSHUDWLRQ &287 FDQ UHGXFH ULSSOH RI 2XWSXW 9ROWDJH WKHUHIRUH ) RU PRUH YDOXH RI WDQWDOXP W\SH FDSDFLWRU LV UHFRP PHQGHG 4. Lx Transistor 3FK3RZHU26)(7LVUHTXLUHGIRUWKLV,&,WVEUHDNGRZQYROWDJHEHWZHHQJDWHDQGVRXUFHVKRXOGEHDIHZ9KLJKHUWKDQ,QSXW9ROWDJH,QWKHFDVHRI,QSXW9ROWDJHLVORZWRWXUQRQ26)(7FRPSOHWHO\WRXVHD26)(7ZLWKORZWKUHVKROGYROWDJH LVHIIHFWLYH,IDODUJHORDGFXUUHQWLVQHFHVVDU\IRU\RXUDSSOLFDWLRQDQGLPSRUWDQWFKRRVHD26)(7ZLWKORZ21UHVLVWDQFH IRUJRRGHIILFLHQF\,IDVPDOOORDGFXUUHQWLVPDLQO\QHFHVVDU\IRU\RXUDSSOLFDWLRQFKRRVHD26)(7ZLWKORZJDWHFDSDFLW\IRUJRRG HIILFLHQF\ D[LPXPFRQWLQXRXVGUDLQFXUUHQWRI26)(7VKRXOGEHODUJHUWKDQSHDNFXUUHQW,/PD[ 13
14 TIMING CHART VIN UVLO Voltage VOUT Set Output Voltage Input Voltage Rising Time UVLO Reset CE VOUT Set Output Voltage Protection Circuit Delay Time EXT VOUT Set Output Voltage Reset Protection VOUT VOUT Set Output Voltage Stable Operation Stable Operation Stable Operation Soft Start Soft Start Soft Start Soft Start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µwkhqrxwsxwzloowxuqriiwkhqvriw VWDUWRSHUDWLRQVWDUWV$IWHUWKHVRIWVWDUWRSHUDWLRQ(;7VLJQDOZLOOEH /µexwliwkhodujhfxuuhqwlvvwlooiorzlqjdi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µ )XUWKHULIWKH9,1LVORZHUWKDQ89/2YROWDJHWKHFLUFXLWLQVLGHZLOOEHVWRSSHGE\89/2IXQFWLRQ $IWHU WKDW LI 9,1 ULVHV XQWLO ZKHQ WKH 9,1 UHDFKHV 89/2 YROWDJH WKH FLUFXLW LQVLGH NHHSV WKH FRQGLWLRQ RI VSUH VWDQGE\ 7KHQDIWHU9,1EHFRPHVEH\RQGWKH89/2WKUHVKROGVRIWVWDUWRSHUDWLRQVWDUWVZKHQWKHVRIWVWDUWRSHUDWLRQILQ LVKHVWKHRSHUDWLRQEHFRPHVVWDEOH 14
15 TEST CIRCUITS A) Output Voltage, Oscillator Frequency, CE H Input Voltage, CE L Input Voltage, Soft-start time L1 PMOS Oscilloscope D1 EXT VIN V + - C1 GND VOUT (VFB) CE + - C2 B) Supply Current 1 C) Standby Current EXT VIN A EXT VIN A GND GND VOUT (VFB) CE VOUT (VFB) CE D) EXT H Output Current E) EXT L Output Current EXT VIN EXT VIN A GND A GND VOUT (VFB) CE VOUT (VFB) CE F) CE H Input Current, CE L Input Current G) Output Delay Time for Protection Circuit EXT VIN EXT VIN GND VOUT (VFB) CE A Oscilloscope GND VOUT (VFB) CE + - C $7+LWDFKL / &'&6XPLGD + 6' 5%'5RKP & )7DQWDOXP7\SH & )7DQWDOXP7\SH 15
16 TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current (*Note) R1224N182E L=1uH R1224N182F L=1uH VIN3.3V VIN5V VIN3.3V VIN5V R1224N182G L=1uH 1.85 R1224N182H L=1uH VIN3.3V VIN5V VIN12V VIN3.3V VIN5V VIN12V R1224N182L L=27uH 1.85 R1224N182M L=27uH VIN3.3V VIN5V VIN3.3V VIN5V VIN12V
17 R1224N332E L=1uH VIN4.8V 3.24 VIN7V R1224N332F L=1uH VIN4.8V VIN7V 3.2 R1224N332G L=1uH VIN4.8V VIN12V VIN15V 3.2 R1224N332G (VIN=1V) R1224N332G (VIN=16V) R1224N332H L=1uH VIN4.8V VIN12V VIN15V
18 R1224N332L L=27uH VIN4.8V VIN7V 3.2 R1224N332M L=27uH VIN4.8V VIN12V VIN15V R1224N332M (VIN=5V) 3.35 R1224N332M (VIN=1V) Output Current lout(a) Output Current lout(a) R1224N332M (VIN=18V) Output Current lout(a) R1224N52E L=1uH VIN6.5V VIN1V
19 R1224N52F L=1uH VIN6.5V VIN1V 4.9 R1224N52G L=1uH VIN6.5V VIN12V VIN15V R1224N52G (VIN=1V) 5.5 R1224N52G (VIN=16V) R1224N52H L=1uH VIN6.5V VIN12V VIN15V 4.9 R1224N52L L=27uH VIN6.5V VIN1V
20 R1224N52M L=27uH VIN6.5V VIN12V VIN15V 4.9 2) Efficiency vs. Output Current (*Note) R1224N182F (VIN=3.3V) CDRH127-1uH R1224N182F (VIN=5.V) CDRH127-1uH R1224N182G (VIN=3.3V) CDRH127-1uH R1224N182G (VIN=5.V) CDRH127-1uH
21 R1224N182G (VIN=12V) CDRH127-1uH R1224N182H (VIN=3.3V) CDRH127-1uH R1224N182H (VIN=5.V) CDRH127-1uH R1224N182H (VIN=12V) CDRH127-1uH R1224N182L (VIN=3.3V) CDRH127-27uH R1224N182L (VIN=5.V) CDRH127-27uH
22 R1224N182M (VIN=3.3V) CDRH127-27uH R1224N182M (VIN=5.V) CDRH127-27uH R1224N182M (VIN=12V) CDRH127-27uH R1224N332E (VIN=7.V) CDRH127-1uH R1224N332E (VIN=4.8V) CDRH127-1uH R1224N332F (VIN=7.V) CDRH127-1uH
23 R1224N332F (VIN=4.8V) CDRH127-1uH R1224N332G (VIN=12V) CDRH127-1uH R1224N332G (VIN=4.8V) CDRH127-1uH R1224N332G (VIN=1V) R1224N332G (VIN=16V) R1224N332G (VIN=15V) CDRH127-1uH
24 R1224N332H (VIN=12V) CDRH127-1uH R1224N332H (VIN=4.8V) CDRH127-1uH R1224N332H (VIN=15V) CDRH127-1uH R1224N332L (VIN=7.V) CDRH127-27uH R1224N332L (VIN=4.8V) CDRH127-27uH R1224N332M (VIN=12V) CDRH127-27uH
25 R1224N332M (VIN=4.8V) CDRH127-27uH R1224N332M (VIN=5V) Output Current lout(a) R1224N332M (VIN=1V) Output Current lout(a) R1224N332M (VIN=18V) Output Current lout(a) R1224N332M (VIN=15V) CDRH127-27uH R1224N52E (VIN=6.5V) CDRH127-1uH
26 R1224N52E (VIN=1V) CDRH127-1uH R1224N52F (VIN=6.5V) CDRH127-1uH R1224N52F (VIN=1V) CDRH127-1uH R1224N52G (VIN=1V) R1224N52G (VIN=16V) R1224N52G (VIN=6.5V) CDRH127-1uH
27 R1224N52G (VIN=12V) CDRH127-1uH R1224N52G (VIN=15V) CDRH127-1uH R1224N52H (VIN=6.5V) CDRH127-1uH R1224N52H (VIN=12V) CDRH127-1uH R1224N52H (VIN=15V) CDRH127-1uH R1224N52L (VIN=6.5V) CDRH127-27uH
28 R1224N52L (VIN=1V) CDRH127-27uH R1224N52M (VIN=6.5V) CDRH127-27uH R1224N52M (VIN=12V) CDRH127-27uH R1224N52M (VIN=15V) CDRH127-27uH RWH 7\SLFDOFKDUDFWHULVWLFVDUHREWDLQHGZLWKXVLQJWKHIROORZLQJFRPSRQHQWV 326,5),5 / &'5+&6XPLGD + & )&HUDPLF7\SH 6' 5%/5RKP & 6$6DQ\R26FRQ )9 & 6&6DQ\R26FRQ )9 5 Ω 28
29 3) Ripple Voltage vs. Output Current R1224N182E L=1uH 7 7 R1224N182F L=1uH Ripple Voltage Vrpp(mV) VIN3.3V VIN5V Ripple Voltage Vrpp(mV) VIN3.3V VIN5V 7 R1224N182G L=1uH 7 R1224N182H L=1uH Ripple Voltage Vrpp(mV) VIN3.3V VIN5V VIN12V Ripple Voltage Vrpp(mV) VIN3.3V VIN5V VIN12V 7 R1224N182L L=27uH 7 R1224N182M L=27uH Ripple Voltage Vrpp(mV) VIN3.3V VIN5V Ripple Voltage Vrpp(mV) VIN3.3V VIN5V VIN12V 29
30 7 R1224N332E L=1uH 7 R1224N332F L=1uH Ripple Voltage Vrpp(mV) VIN4.8V VIN7V Ripple Voltage Vrpp(mV) VIN4.8V VIN7V 7 R1224N332G L=1uH 7 R1224N332H L=1uH Ripple Voltage Vrpp(mV) VIN4.8V 6 VIN12V VIN15V Ripple Voltage Vrpp(mV) VIN4.8V VIN12V VIN15V 7 R1224N332L L=27uH 7 R1224N332M L=27uH Ripple Voltage Vrpp(mV) VIN4.8V VIN7V Ripple Voltage Vrpp(mV) VIN4.8V VIN12V VIN15V 3
31 7 R1224N52E L=1uH 7 R1224N52F L=1uH Ripple Voltage Vrpp(mV) VIN6.5V VIN1V Ripple Voltage Vrpp(mV) VIN6.5V VIN1V 7 R1224N52G L=1uH 7 R1224N52H L=1uH Ripple Voltage Vrpp(mV) VIN6.5V VIN12V VIN15V Ripple Voltage Vrpp(mV) VIN6.5V VIN12V VIN15V 7 R1224N52L L=27uH 7 R1224N52M L=27uH Ripple Voltage Vrpp(mV) VIN6.5V VIN1V Ripple Voltage Vrpp(mV) VIN6.5V VIN12V VIN15V 31
32 4) Output Voltage vs. Input Voltage R1224N182E L=1uH mA mA Input Voltage VIN(V) R1224N182F L=1uH mA mA Input Voltage VIN(V) R1224N182G L=1uH mA mA Input Voltage VIN(V) R1224N182H L=1uH mA mA Input Voltage VIN(V) R1224N182L L=27uH mA mA Input Voltage VIN(V) R1224N182M L=27uH mA mA Input Voltage VIN(V) 32
33 R1224N332E L=1uH mA 5mA Input Voltage VIN(V) R1224N332F L=1uH mA 5mA Input Voltage VIN(V) R1224N332G L=1uH mA -5mA Input Voltage VIN(V) R1224N332H L=1uH mA -5mA Input Voltage VIN(V) R1224N332L L=27uH mA 5mA Input Voltage VIN(V) R1224N332M L=27uH mA 5mA Input Voltage VIN(V) 33
34 R1224N52E L=1uH mA mA Input Voltage VIN(V) R1224N52F L=1uH mA mA Input Voltage VIN(V) R1224N52G L=1uH mA -5mA Input Voltage VIN(V) R1224N52H L=1uH mA mA Input Voltage VIN(V) R1224N52L L=27uH mA mA Input Voltage VIN(V) R1224N52M L=27uH mA mA Input Voltage VIN(V) 34
35 5) Output Voltage vs. Temperature R1224N332E R1224N122F Temperature Topt( C) Temperature Topt( C) 6.1 R1224N62L 1.1 R1224N12G Temperature Topt( C) Temperature Topt( C) 6) Oscillator Frequency vs. Temperature Oscillator Frequency fosc(khz) R1224N12G Temperature Topt( C) Oscillator Frequency fosc(khz) R1224N12H Temperature Topt( C) 35
36 Oscillator Frequency fosc(khz) R1224N12M Temperature Topt( C) 7) Supply Current vs. Temperature R1224N332E R1224N62L Supply Current1 Iss1(µA) Supply Current1 Iss1(µA) Temperature Topt( C) Temperature Topt( C) 25 R1224N62F 4 R1224N12G Supply Current1 Iss1(µA) Supply Current1 Iss1(µA) Temperature Topt( C) Temperature Topt( C) 36
37 6 R1224N12H 4 R1224N12M Supply Current1 Iss1(µA) Supply Current1 Iss1(µA) Temperature Topt( C) Temperature Topt( C) 8) Soft-start time vs. Temperature R1224N12G 15 Soft-start time Tsoft(ms) Temperature Topt( C) 9) Delay Time for Protection vs. Temperature Delay Time for Protection Tprot(ms) R1224N332E Temperature Topt( C) 37
38 1) EXT H Output Current vs. Temperature EXT "H" Output Current IEXTH(mA) R1224N332E Temperature Topt( C) 11) EXT L Output Current vs. Temperature EXT "L" Output Current IEXTL(mA) R1224N332E Temperature Topt( C) 12) Load Transient Response R1224N332G L=1uH VIN=4.8V E-4 2E-4 3E-4 4E-4 Time(sec) R1224N332G L=1uH VIN=4.8V Time(sec)
39 R1224N332G L=1uH VIN=1V Time(sec) R1224N332G L=1uH VIN=1V Time(sec) R1224N332H L=1uH VIN=4.8V 2.5-2E-4-1E-4 1E-4 2E-4 3E-4 4E-4 Time(sec) R1224N332H L=1uH VIN=4.8V Time(sec) R1224N332H L=1uH VIN=1V 2.5-2E-4-1E-4 1E-4 2E-4 3E-4 4E-4 Time(sec) R1224N332H L=1uH VIN=1V 2.5-2E-4-1E Time(sec)
40 R1224N332M L=27uH VIN=4.8V 2.5-2E-4-1E Time(sec) R1224N332M L=27uH VIN=4.8V Time(sec) R1224N332M L=27uH VIN=1V 2.5-2E-4-1E-4 1E-4 2E-4 3E-4 4E-4 Time(sec) R1224N332M L=27uH VIN=1V Time(sec) ) UVLO Voltage vs. Temperature 2.2 R1224N332E UVLO Voltage VUVLO(V) Temperature Topt( C) 4
516(5,(6. PWM/VFM step-down DC/DC Converter
PWM/VFM step-down DC/DC Converter 516(5,(6 NO. EA-97-212 OUTLINE 7KH516HULHVDUH&26EDVHG3:VWHSGRZQ'&'&&RQYHUWHUFRQWUROOHUVZLWKORZVXSSO\FXUUHQW (DFKRIWKHVH,&VFRQVLVWVRIDQRVFLOODWRUD3:FRQWUROFLUFXLWDUHIHUHQFHYROWDJHXQLWDQHUURUDPSOLILHUDVRIW
516(5,(6. LOW NOISE 150mA LDO REGULATOR
LOW NOISE ma LDO REGULATOR 6(,(6 NO. EA-7-4 OUTLINE 7KH6HULHVDUH&6EDVHGYROWDJHUHJXODWRU,&VZLWKKLJKRXWSXWYROWDJHDFFXUDF\H[WUHPHO\ORZVXS SO\FXUUHQWORZUHVLVWDQFHDQGKLJKLSSOHHMHFWLRQ(DFK RI WKHVH YROWDJH UHJXODWRU,&V
5V/9V/12V Output QC2.0+USB Auto Detect+USB-PD Type-C Application Report ACT4529
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Distributed by: www.jameco.com -800-83-4242 The content and copyrights of the attached material are the property of its owner. Single-Chip Voice Record/Playback Devices 60-, 75-, 90-, and 20-Second Durations
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4.8 V NPN Silicon ipolar Common Emitter Transistor Technical Data AT-3886 Features 4.8 Volt Pulsed (pulse width = 577 µsec, duty cycle = 12.5%)/CW Operation +28 dm Pulsed P out @ 9 MHz, Typ. +23.5 dm CW
Polymer PTC Resettable Fuse: KMC Series
Features 1. RoHS & Halogen-Free (HF) compliant 2. IA size: 0603, 0805, 1206, 1812 3. Hold current ratings from 0.05 to 3A 4. Voltage ratings from 6V computer and electronic applications to 60V 5. Small