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LT1431IS8-PBF Datasheet(PDF) 10 Page - Linear Technology |
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LT1431IS8-PBF Datasheet(HTML) 10 Page - Linear Technology |
10 / 14 page LT1431 0 1431fd Typical applicaTions 5V Power Supply Monitor with ±500mV Window and 50mV Hysteresis Transfer Function High Efficiency Buck Converter E = 85% to 89% COLL REF GND-F V+ GND-S 10** “HIGH” FOR OVER VOLTAGE OR UNDER VOLTAGE 5k 1N4148 COLL REF GND-F V+ GND-S 10** 5k 4k* 1k 6k* 1k *DETERMINES WINDOW SIZE V = (R – 5k)(0.5mA) **SETS HYSTERESIS LT1431 TA13 LT1431 LT1431 VIN 0 0 1 2 3 4 6 1 2 3 4 LT1431 TA14 5 6 5 COLL 1 2 6 5 REF RMID 3 Q3 2N3904 4 8 7 V+ RTOP R8* 24.9k COMP GND-F GND-S LT1431CN8 + + R2 1k C3 0.1µF C5 0.047µF C4 0.033µF R6* 23.7k 5V 2.5A C6 470µF 16V 0.12 ESR R7* 24.9k 1431 TA15 Q2 2N3904 D2 BAT85 D4 BAT85 R1 470k C2 4.7µF 35V TANT L1 50µH 3A R5 680 Q1 VN2222LL RUN = 0 SHUTDOWN > 3V R4 100 R3 10k NOTES: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTANCES ARE IN , 0.25W, 5% 2. ALL CAPACITANCES ARE IN µF, 50V, 10% 3. SHUTDOWN LOGIC STATE MUST BE DEFINED BY A LOGIC GATE OR BY TYING TO GND 1 2 RTN OFF 1 VIN D1 BAT85 C1 220µF 35V D3 MBR330 BOLD LINES INDICATE HIGH CURRENT PATHS *1% FILM RESISTORS C1: NICHICON UPL1V221MPH C3, C4, C5: WIMA MKS-2 C6: NICHICON UPL1C471MPH6 D1, D2: PHILIPS BAT85 D3: MOTOROLA MBR330 L1: COILTRONICS CTX50-3-MP LT1170 VIN VC GND VSW FB 3 1 2 4 5 |
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