516(5,(6. PWM/VFM step-down DC/DC Converter
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9 OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS :KHQ/[7ULV 21µ :KHUHLQ5LSSOH&XUUHQW33YDOXHLVGHVFULEHGDV,5321UHVLVWDQFHRI/;7ULVGHVFULEHGDV5SWKHGLUHFWFXUUHQWRI WKHLQGXFWRULVGHVFULEHGDV5/ 9, S5/,287/,53WRQ(TXDWLRQ :KHQ/[7ULV 2))µ /,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 9
10 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 $VIRU&,1XVHDFDSDFLWRUZLWKORZ(65(TXLYDOHQW6HULHV5HVLVWDQFHDQGDFDSDFLW\RIDWOHDVW )IRUVWDEOH RSHUDWLRQ &287 FDQ UHGXFH ULSSOH RI 2XWSXW 9ROWDJH WKHUHIRUH ) RU PRUH YDOXH RI WDQWDOXP W\SH FDSDFLWRU LV UHFRP PHQGHG 4. Lx Transistor 3FK3RZHU26)(7LVUHTXLUHGIRUWKLV,&,WVEUHDNGRZQYROWDJHEHWZHHQJDWHDQGVRXUFHVKRXOGEHDIHZ9KLJKHUWKDQ,QSXW9ROWDJH,QWKHFDVHRI,QSXW9ROWDJHLVORZWRWXUQRQ26)(7FRPSOHWHO\WRXVHD26)(7ZLWKORZWKUHVKROGYROWDJH LVHIIHFWLYH,IDODUJHORDGFXUUHQWLVQHFHVVDU\IRU\RXUDSSOLFDWLRQDQGLPSRUWDQWFKRRVHD26)(7ZLWKORZ21UHVLVWDQFH IRUJRRGHIILFLHQF\,IDVPDOOORDGFXUUHQWLVPDLQO\QHFHVVDU\IRU\RXUDSSOLFDWLRQFKRRVHD26)(7ZLWKORZJDWHFDSDFLW\IRUJRRG HIILFLHQF\ D[LPXPFRQWLQXRXVGUDLQFXUUHQWRI26)(7VKRXOGEHODUJHUWKDQSHDNFXUUHQW,/PD[ 1
11 TIMING CHART Case 1. Set VOUT Voltage >2.1V (Set VOUT Voltage>UVLO Voltage) VIN UVLO Voltage VOUT Set Output Voltage Input Voltage Rising Time UVLO Reset CE VOUT Set Output Voltage Protection Circuit Delay Time CE Reset Protection Circuit Delay Time VOUT Set Output Voltage EXT VOUT Set Output Voltage Latch Protection Latch Protection VOUT Stable Operation Stable Operation Stable Operation Soft Start Soft Start Soft Start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µwkhqrxwsxwzloowxuqrii7ruh OHDVHWKHODWFKSURWHFWLRQLQSXWYROWDJHVKRXOGEHHTXDORUORZHUWKDQ89/2OHYHORUUHVWDUWZLWK&(2QFHWXUQRII WKHFLUFXLWZLWK&(DQGWXUQLWRQDJDLQ,QWKHWLPLQJFKDUJHDERYHUHOHDVHWKHODWFKIXQFWLRQLVUHDOL]HGZLWK&(VLJ QDOIURP /µwr +µ$iwhuuhprylqjwkhfdxvhriodujhfxuuhqwdqgwkhuhvhwzlwk&(vriwvwduwrshudwlrqvwduwvdqg DIWHUWKHVRIWVWDUWWLPHWKHRSHUDWLRQZLOOEHEDFNWRVWDEOH,IWKH9,1EHFRPHVORZHUWKDQWKHVHW9287WKDWVLWXDWLRQLVVDPHDVODUJHFXUUHQWFRQGLWLRQVRSURWHFWLRQFLUFXLW PD\EHUHDG\WRZRUNWKHUHIRUHDIWHUWKHGHOD\WLPHRISURWHFWLRQFLUFXLW(;7ZLOOEH +µdqgwkhrxwsxwwxuqvrii )XUWKHULIWKH9,1LVORZHUWKDQ89/2YROWDJHWKHFLUFXLWLQVLGHZLOOEHVWRSSHGE\89/2IXQFWLRQ $IWHUWKDWLI9,1ULVHVXQWLOZKHQWKH9,1UHDFKHVWKHVHWRXWSXWYROWDJHWKHFLUFXLWLQVLGHNHHSVWKHFRQGLWLRQRI SUHVWDQGE\ 7KHQDIWHU9,1EHFRPHVEH\RQGWKHVHWRXWSXWYROWDJHVRIWVWDUWRSHUDWLRQVWDUWVZKHQWKHVRIWVWDUWRSHUDWLRQ ILQLVKHVWKHRSHUDWLRQEHFRPHVVWDEOH 11
12 Case 2. Set VOUT Voltage 2.V (Set VOUT Voltage < UVLO Voltage) VIN Input Voltage Rising Time UVLO Voltage VOUT Set Output Voltage UVLO Reset CE UVLO Voltage Protection Circuit Delay Time Reset with CE EXT UVLO Voltage VOUT Set Output Voltage Latch Protection VOUT Stable Operation Stable Operation Stable Operation Soft Start Soft Start Soft Start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µwkhqrxwsxwzloowxuqrii7ruh OHDVHWKHODWFKSURWHFWLRQLQSXWYROWDJHVKRXOGEHHTXDORUORZHUWKDQ89/2OHYHORUUHVWDUWZLWK&(2QFHWXUQRII WKHFLUFXLWZLWK&(DQGWXUQLWRQDJDLQ,QWKHWLPLQJFKDUJHDERYHUHOHDVHWKHODWFKIXQFWLRQLVUHDOL]HGZLWK&(VLJ QDOIURP /µwr +µ$iwhuuhprylqjwkhfdxvhriodujhfxuuhqwdqgwkhuhvhwzlwk&(vriwvwduwrshudwlrqvwduwvdqg DIWHUWKHVRIWVWDUWWLPHWKHRSHUDWLRQZLOOEHEDFNWRVWDEOH )XUWKHULIWKH9,1LVORZHUWKDQ89/2YROWDJHWKHFLUFXLWLQVLGHZLOOEHVWRSSHGE\89/2IXQFWLRQ $IWHUWKDWLI9,1 ULVHVXQWLOZKHQWKH9,1 UHDFKHV 89/2 YROWDJH WKH FLUFXLW LQVLGH NHHSV WKH FRQGLWLRQ RI SUH VWDQGE\ 7KHQDIWHU9,1 EHFRPHVEH\RQG WKH 89/2 YROWDJH VRIWVWDUW RSHUDWLRQ VWDUWV ZKHQ WKH VRIWVWDUW RSHUDWLRQ ILQ LVKHVWKHRSHUDWLRQEHFRPHVVWDEOH 12
13 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 DLY CE + - C2 B) Supply Current 1 C) Standby Current EXT VIN A EXT VIN A GND DLY GND DLY VOUT CE VOUT CE D) EXT H Output Current E) EXT L Output Current EXT VIN EXT VIN A GND DLY A GND DLY VOUT CE VOUT CE F) DLY Switch Current EXT GND VOUT VIN DLY CE A 13
14 G) CE H Input Current, CE L Input Current H) Output Delay Time for Protection Circuit EXT VIN EXT VIN GND VOUT DLY CE A Oscilloscope GND VOUT DLY CE C3 + - C $7+LWDFKL / &'&6XPLGD + 6' 5%'5RKP & )7DQWDOXP7\SH & )7DQWDOXP7\SH &Q)&HUDPLF7\SH TYPICAL CHARACTERISTICS $OPRVWDOOWKHFKDUDFWHULVWLFVRI51VHULHVDUHVDPHDV516HULHV([FHSWWKHIROORZLQJFKDUDFWHULVWLFV UHIHUWRWKHGDWDVKHHWRI516HULHV 1) Efficiency vs. Output Current R1225N182A (VIN=3.3V) CDRH127-1uH R1225N182B (VIN=3.3V) CDRH127-1uH R1225N182A (VIN=5.V) CDRH127-1uH R1225N182B (VIN=5.V) CDRH127-1uH
15 R1225N182C (VIN=3.3V) CDRH127-1uH R1225N182C (VIN=5.V) CDRH127-1uH R1225N182C (VIN=12V) CDRH127-1uH R1225N182D (VIN=3.3V) CDRH127-1uH R1225N182D (VIN=5.V) CDRH127-1uH R1225N182D (VIN=12V) CDRH127-1uH
16 R1225N182J (VIN=3.3V) CDRH127-27uH R1225N182J (VIN=5.V) CDRH127-27uH R1225N182K (VIN=3.3V) CDRH127-27uH R1225N182K (VIN=5.V) CDRH127-27uH R1225N182K (VIN=12V) CDRH127-27uH R1225N332A (VIN=4.8V) CDRH127-1Uh
17 R1225N332A (VIN=7.V) CDRH127-1uH R1225N332B (VIN=4.8V) CDRH127-1uH R1225N332B (VIN=7.V) CDRH127-1uH R1225N332C (VIN=4.8V) CDRH127-1uH R1225N332C (VIN=12V) CDRH127-1uH R1225N332C (VIN=15V) CDRH127-1uH
18 R1225N332D (VIN=4.8V) CDRH127-1uH R1225N332D (VIN=12V) CDRH127-1uH R1225N332D (VIN=15V) CDRH127-1uH R1225N332K (VIN=4.8V) CDRH127-27uH R1225N332K (VIN=12V) CDRH127-27uH R1225N332K (VIN=15V) CDRH127-27uH
19 R1225N52A (VIN=6.5V) CDRH127-1uH R1225N52A (VIN=1V) CDRH127-1uH R1225N52B (VIN=6.5V) CDRH127-1uH R1225N52B (VIN=1V) CDRH127-1uH R1225N52C (VIN=6.5V) CDRH127-1uH R1225N52C (VIN=12V) CDRH127-1uH
20 R1225N52C (VIN=15V) CDRH127-1uH R1225N52D (VIN=6.5V) CDRH127-1uH R1225N52D (VIN=12V) CDRH127-1uH R1225N52D (VIN=15V) CDRH127-1uH R1225N52J (VIN=6.5V) CDRH127-27uH R1225N52J (VIN=1V) CDRH127-27uH
21 R1225N52K (VIN=6.5V) CDRH127-27uH R1225N52K (VIN=12V) CDRH127-27uH R1225N52K (VIN=15V) CDRH127-27uH ) Ripple Voltage vs. Output Current R1225N182A L=1uH 7 7 R1225N182B L=1uH VIN=3.3V VIN=5.V VIN=3.3V VIN=5.V 21
22 7 R1225N182C L=1uH 7 R1225N182D L=1uH VIN= 3.3V VIN= 5.V VIN=12.V VIN= 3.3V VIN= 5.V VIN=12.V 7 R1225N182J L=27uH 7 R1225N182K L=27uH VIN=3.3V VIN=5.V VIN= 3.3V VIN= 5.V VIN=12.V 7 R1225N332A L=1uH 7 R1225N332B L=1uH VIN=4.8V VIN=7.V VIN=4.8V VIN=7.V 22
23 7 R1225N332C L=1uH 7 R1225N332D L=1uH VIN= 4.8V VIN=12.V VIN=15.V VIN= 4.8V VIN=12.V VIN=15.V 7 R1225N332J L=27uH 7 R1225N332K L=27uH VIN=4.8V VIN=7.V VIN= 4.8V VIN=12.V VIN=15.V 7 R1225N52A L=1uH 7 R1225N52B L=1uH VIN= 6.5V VIN=1.V VIN= 6.5V VIN=1.V 23
24 7 R1225N52C L=1uH 7 R1225N52D L=1uH VIN= 6.5V VIN=12.V VIN=15.V VIN= 6.5V VIN=12.V VIN=15.V 7 R1225N52J L=27uH R1225N52K L=27uH VIN= 6.5V VIN=1.V VIN= 6.5V VIN=12.V VIN=15.V 3) Input Voltage vs. Output Voltage R1225N182A L=1uH mA 1.7 5mA Input Voltage VIN(V) R1225N182B L=1uH mA 1.7 5mA Input Voltage VIN(V) 24
25 2. R1225N182C L=1uH 2. R1225N182D L=1uH mA 5mA mA 5mA Input Voltage VIN(V) Input Voltage VIN(V) 2. R1225N182J L=27uH 2. R1225N182K L=27uH mA 5mA mA 5mA Input Voltage VIN(V) Input Voltage VIN(V) R1225N332A L=1uH 1mA 5mA Input Voltage VIN(V) R1225N332B L=1uH 1mA 5mA Input Voltage VIN(V) 25
26 R1225N332C L=1uH 1mA 5mA Input Voltage VIN(V) R1225N332D L=1uH 1mA 5mA Input Voltage VIN(V) R1225N332J L=27uH 1mA 5mA Input Voltage VIN(V) R1225N332K L=27uH 1mA 5mA Input Voltage VIN(V) 4) Output Voltage vs. Output Current R1225N182A L=1uH R1225N182B L=1uH VIN=3.3V VIN=5.V VIN=3.3V VIN=5.V
27 1.85 R1225N182C L=1uH 1.85 R1225N182D L=1uH VIN= 3.3V 1.77 VIN= 5.V VIN=12.V VIN= 3.3V 1.77 VIN= 5.V VIN=12.V R1225N182J L=27uH 1.85 R1225N182K L=27uH VIN=3.3V VIN=5.V VIN= 3.3V 1.77 VIN= 5.V VIN=12.V R1225N332A L=1uH VIN=4.8V VIN=7.V R1225N332B L=1uH VIN=4.8V VIN=7.V
28 R1225N332C L=1uH VIN= 4.8V VIN=12.V VIN=15.V 3.2 R1225N332D L=1uH VIN= 4.8V 3.24 VIN=12.V 3.22 VIN=15.V R1225N332J L=27uH VIN=4.8V VIN=7.V 3.2 R1225N332K L=27uH VIN= 4.8V 3.24 VIN=12.V 3.22 VIN=15.V R1225N52A L=1uH VIN= 6.5V VIN=1.V R1225N52B L=1uH VIN= 6.5V VIN=1.V
29 R1225N52C L=1uH VIN= 6.5V VIN=12.V VIN=15.V 4.9 R1225N52D L=1uH VIN= 6.5V 4.94 VIN=12.V 4.92 VIN=15.V R1225N52J L=27uH VIN= 6.5V VIN=1.V 4.9 R1225N52K L=27uH VIN= 6.5V 5.4 VIN=12.V 5.2 VIN=15.V ) Load Transient Response R1225N332A L=1uH VIN=4.8V Time(sec) R1225N332A L=1uH VIN=4.8V Time(sec)
30 R1225N332A L=1uH VIN=7V Time(sec) R1225N332A L=1uH VIN=7V Time(sec) R1225N332B L=1uH VIN=4.8V Time(sec) R1225N332B L=1uH VIN=4.8V Time(sec) R1225N332B L=1uH VIN=7V Time(sec) R1225N332B L=1uH VIN=7V Time(sec)
31 R1225N332J L=27uH VIN=4.8V Time(sec) R1225N332J L=27uH VIN=4.8V Time(sec) R1225N332J L=1uH VIN=7V Time(sec) R1225N332J L=27uH VIN=7V Time(sec)
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