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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 $IWHUWKDWLI9,1ULVHVXQWLOZKHQWKH9,1UHDFKHVWKHVHWRXWSXWYROWDJHWKHFLUFXLWLQVLGHNHHSVWKHFRQGLWLRQRI SUHVWDQGE\ 7KHQDIWHU9,1EHFRPHVEH\RQGWKHVHWRXWSXWYROWDJHVRIWVWDUWRSHUDWLRQVWDUWVZKHQWKHVRIWVWDUWRSHUDWLRQ ILQLVKHVWKHRSHUDWLRQEHFRPHVVWDEOH 11
Case 2. Set VOUT Voltage 2.V (Set VOUT Voltage < UVLO Voltage) VIN Input Voltage Rising Time UVLO Voltage VOUT Set Output Voltage UVLO Reset CE UVLO Voltage Protection Circuit Delay Time Reset with CE EXT UVLO Voltage VOUT Set Output Voltage Latch Protection VOUT Stable Operation Stable Operation Stable Operation Soft Start Soft Start Soft Start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µwkhqrxwsxwzloowxuqrii7ruh OHDVHWKHODWFKSURWHFWLRQLQSXWYROWDJHVKRXOGEHHTXDORUORZHUWKDQ89/2OHYHORUUHVWDUWZLWK&(2QFHWXUQRII WKHFLUFXLWZLWK&(DQGWXUQLWRQDJDLQ,QWKHWLPLQJFKDUJHDERYHUHOHDVHWKHODWFKIXQFWLRQLVUHDOL]HGZLWK&(VLJ QDOIURP /µwr +µ$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
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
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 + - C2 326 +$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 1 9 8 7 6 5 4 3 2 1 R1225N182B (VIN=3.3V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N182A (VIN=5.V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N182B (VIN=5.V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 14
R1225N182C (VIN=3.3V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N182C (VIN=5.V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N182C (VIN=12V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N182D (VIN=3.3V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N182D (VIN=5.V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N182D (VIN=12V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 15
R1225N182J (VIN=3.3V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 R1225N182J (VIN=5.V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 R1225N182K (VIN=3.3V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 R1225N182K (VIN=5.V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 R1225N182K (VIN=12V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 R1225N332A (VIN=4.8V) CDRH127-1Uh 1 9 8 7 6 5 4 3 2 1 16
R1225N332A (VIN=7.V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N332B (VIN=4.8V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N332B (VIN=7.V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N332C (VIN=4.8V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N332C (VIN=12V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N332C (VIN=15V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 17
R1225N332D (VIN=4.8V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N332D (VIN=12V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N332D (VIN=15V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N332K (VIN=4.8V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 R1225N332K (VIN=12V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 R1225N332K (VIN=15V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 18
R1225N52A (VIN=6.5V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N52A (VIN=1V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N52B (VIN=6.5V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N52B (VIN=1V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N52C (VIN=6.5V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N52C (VIN=12V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 19
R1225N52C (VIN=15V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N52D (VIN=6.5V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N52D (VIN=12V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N52D (VIN=15V) CDRH127-1uH 1 9 8 7 6 5 4 3 2 1 R1225N52J (VIN=6.5V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 R1225N52J (VIN=1V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 2
R1225N52K (VIN=6.5V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 R1225N52K (VIN=12V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 R1225N52K (VIN=15V) CDRH127-27uH 1 9 8 7 6 5 4 3 2 1 2) Ripple Voltage vs. Output Current R1225N182A L=1uH 7 7 R1225N182B L=1uH 6 5 4 3 2 1 VIN=3.3V VIN=5.V 6 5 4 3 2 1 VIN=3.3V VIN=5.V 21
7 R1225N182C L=1uH 7 R1225N182D L=1uH 6 5 4 3 2 1 VIN= 3.3V VIN= 5.V VIN=12.V 6 5 4 3 2 1 VIN= 3.3V VIN= 5.V VIN=12.V 7 R1225N182J L=27uH 7 R1225N182K L=27uH 6 5 4 3 2 1 VIN=3.3V VIN=5.V 6 5 4 3 2 1 VIN= 3.3V VIN= 5.V VIN=12.V 7 R1225N332A L=1uH 7 R1225N332B L=1uH 6 5 4 3 2 1 VIN=4.8V VIN=7.V 6 5 4 3 2 1 VIN=4.8V VIN=7.V 22
7 R1225N332C L=1uH 7 R1225N332D L=1uH 6 5 4 3 2 1 VIN= 4.8V VIN=12.V VIN=15.V 6 5 4 3 2 1 VIN= 4.8V VIN=12.V VIN=15.V 7 R1225N332J L=27uH 7 R1225N332K L=27uH 6 5 4 3 2 1 VIN=4.8V VIN=7.V 6 5 4 3 2 1 VIN= 4.8V VIN=12.V VIN=15.V 7 R1225N52A L=1uH 7 R1225N52B L=1uH 6 5 4 3 2 1 VIN= 6.5V VIN=1.V 6 5 4 3 2 1 VIN= 6.5V VIN=1.V 23
7 R1225N52C L=1uH 7 R1225N52D L=1uH 6 5 4 3 2 1 VIN= 6.5V VIN=12.V VIN=15.V 6 5 4 3 2 1 VIN= 6.5V VIN=12.V VIN=15.V 7 R1225N52J L=27uH R1225N52K L=27uH 7 6 5 4 3 2 1 VIN= 6.5V VIN=1.V 6 5 4 3 2 1 VIN= 6.5V VIN=12.V VIN=15.V 3) Input Voltage vs. Output Voltage R1225N182A L=1uH 2. 1.95 1.9 1.85 1.8 1.75 1mA 1.7 5mA 1.65 1.6 5 1 15 2 Input Voltage VIN(V) R1225N182B L=1uH 2. 1.95 1.9 1.85 1.8 1.75 1mA 1.7 5mA 1.65 1.6 5 1 15 2 Input Voltage VIN(V) 24
2. R1225N182C L=1uH 2. R1225N182D L=1uH 1.95 1.9 1.85 1.8 1.75 1.7 1.65 1mA 5mA 1.95 1.9 1.85 1.8 1.75 1.7 1.65 1mA 5mA 1.6 5 1 15 2 Input Voltage VIN(V) 1.6 5 1 15 2 Input Voltage VIN(V) 2. R1225N182J L=27uH 2. R1225N182K L=27uH 1.95 1.9 1.85 1.8 1.75 1.7 1.65 1mA 5mA 1.95 1.9 1.85 1.8 1.75 1.7 1.65 1mA 5mA 1.6 5 1 15 2 Input Voltage VIN(V) 1.6 5 1 15 2 Input Voltage VIN(V) 3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 3.24 3.22 R1225N332A L=1uH 1mA 5mA 3.2 5 1 15 2 Input Voltage VIN(V) 3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 3.24 3.22 R1225N332B L=1uH 1mA 5mA 3.2 5 1 15 2 Input Voltage VIN(V) 25
3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 3.24 3.22 R1225N332C L=1uH 1mA 5mA 3.2 5 1 15 2 Input Voltage VIN(V) 3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 3.24 3.22 R1225N332D L=1uH 1mA 5mA 3.2 5 1 15 2 Input Voltage VIN(V) 3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 3.24 3.22 R1225N332J L=27uH 1mA 5mA 3.2 5 1 15 2 Input Voltage VIN(V) 3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 3.24 3.22 R1225N332K L=27uH 1mA 5mA 3.2 5 1 15 2 Input Voltage VIN(V) 4) Output Voltage vs. Output Current R1225N182A L=1uH 1.85 1.85 R1225N182B L=1uH 1.83 1.81 1.79 1.77 VIN=3.3V VIN=5.V 1.75 1.83 1.81 1.79 1.77 VIN=3.3V VIN=5.V 1.75 26
1.85 R1225N182C L=1uH 1.85 R1225N182D L=1uH 1.83 1.81 1.79 VIN= 3.3V 1.77 VIN= 5.V VIN=12.V 1.75 1.83 1.81 1.79 VIN= 3.3V 1.77 VIN= 5.V VIN=12.V 1.75 1.85 R1225N182J L=27uH 1.85 R1225N182K L=27uH 1.83 1.81 1.79 1.77 VIN=3.3V VIN=5.V 1.75 1.83 1.81 1.79 VIN= 3.3V 1.77 VIN= 5.V VIN=12.V 1.75 3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 3.24 3.22 R1225N332A L=1uH VIN=4.8V VIN=7.V 3.2 3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 3.24 3.22 R1225N332B L=1uH VIN=4.8V VIN=7.V 3.2 27
3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 3.24 3.22 R1225N332C L=1uH VIN= 4.8V VIN=12.V VIN=15.V 3.2 R1225N332D L=1uH 3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 VIN= 4.8V 3.24 VIN=12.V 3.22 VIN=15.V 3.2 3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 3.24 3.22 R1225N332J L=27uH VIN=4.8V VIN=7.V 3.2 R1225N332K L=27uH 3.4 3.38 3.36 3.34 3.32 3.3 3.28 3.26 VIN= 4.8V 3.24 VIN=12.V 3.22 VIN=15.V 3.2 5.1 5.8 5.6 5.4 5.2 5. 4.98 4.96 4.94 4.92 R1225N52A L=1uH VIN= 6.5V VIN=1.V 4.9 5.1 5.8 5.6 5.4 5.2 5. 4.98 4.96 4.94 4.92 R1225N52B L=1uH VIN= 6.5V VIN=1.V 4.9 28
5.1 5.8 5.6 5.4 5.2 5. 4.98 4.96 4.94 4.92 R1225N52C L=1uH VIN= 6.5V VIN=12.V VIN=15.V 4.9 R1225N52D L=1uH 5.1 5.8 5.6 5.4 5.2 5. 4.98 4.96 VIN= 6.5V 4.94 VIN=12.V 4.92 VIN=15.V 4.9 5.1 5.8 5.6 5.4 5.2 5. 4.98 4.96 4.94 4.92 R1225N52J L=27uH VIN= 6.5V VIN=1.V 4.9 R1225N52K L=27uH 5.1 5.8 5.6 VIN= 6.5V 5.4 VIN=12.V 5.2 VIN=15.V 5. 4.98 4.96 4.94 4.92 4.9 5) Load Transient Response R1225N332A L=1uH VIN=4.8V 3.5 2 3.4 18 3.3 16 3.2 14 3.1 12 3. 1 2.9 8 2.8 6 2.7 4 2.6 2 2.5 -.2 -.1..1.2.3.4 Time(sec) 3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 3.5 R1225N332A L=1uH VIN=4.8V 3. -.5..5.1.15 Time(sec) 2 18 16 14 12 1 8 6 4 2 29
3.5 3.4 3.3 3.2 3.1 3. 2.9 2.8 2.7 2.6 R1225N332A L=1uH VIN=7V 2.5 -.2 -.1..1.2.3.4 Time(sec) 2 18 16 14 12 1 8 6 4 2 3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 3.5 R1225N332A L=1uH VIN=7V 3. -.5..5.1.15 Time(sec) 2 18 16 14 12 1 8 6 4 2 3.5 3.4 3.3 3.2 3.1 3. 2.9 2.8 2.7 2.6 R1225N332B L=1uH VIN=4.8V 2.5 -.2 -.1..1.2.3.4 Time(sec) 2 18 16 14 12 1 8 6 4 2 3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 3.5 R1225N332B L=1uH VIN=4.8V 3. -.4 -.2.2.4.6.8 Time(sec) 2 18 16 14 12 1 8 6 4 2 3.5 3.4 3.3 3.2 3.1 3. 2.9 2.8 2.7 2.6 R1225N332B L=1uH VIN=7V 2.5 -.2 -.1..1.2.3.4 Time(sec) 2 18 16 14 12 1 8 6 4 2 3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 3.5 R1225N332B L=1uH VIN=7V 3. -.4 -.2.2.4.6.8 Time(sec) 2 18 16 14 12 1 8 6 4 2 3
3.5 3.4 3.3 3.2 3.1 3. 2.9 2.8 2.7 2.6 R1225N332J L=27uH VIN=4.8V 2.5 -.2 -.1..1.2.3.4 Time(sec) 2 18 16 14 12 1 8 6 4 2 3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 3.5 R1225N332J L=27uH VIN=4.8V 3. -.4 -.2.2.4.6.8 Time(sec) 2 18 16 14 12 1 8 6 4 2 3.5 3.4 3.3 3.2 3.1 3. 2.9 2.8 2.7 2.6 R1225N332J L=1uH VIN=7V 2.5 -.2 -.1..1.2.3.4 Time(sec) 2 18 16 14 12 1 8 6 4 2 3.5 3.45 3.4 3.35 3.3 3.25 3.2 3.15 3.1 3.5 R1225N332J L=27uH VIN=7V 3. -.4 -.2.2.4.6.8 Time(sec) 2 18 16 14 12 1 8 6 4 2 31