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LT1172HVI 数据表(PDF) 10 Page - Linear Technology |
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LT1172HVI 数据表(HTML) 10 Page - Linear Technology |
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10 / 20 page  10 LT1170/LT1171/LT1172 Flyback Converter LCD Contrast Supply 1170/1/2 TA03 D1 C1 2000 µF C4* 100 µF C2 0.15 µF R1 3.74k R2 1.24k VIN 20V TO 30V R3 1.5k *REQUIRED IF INPUT LEADS ≥ 2" LT1170 VIN VSW FB VC OPTIONAL FILTER L2 5 µH C4 100 µF VOUT 5V 6A VSNUB CLAMP TURN-ON SPIKE PRIMARY FLYBACK VOLTAGE = LT1170 SWITCH VOLTAGE AREA “a” = AREA “b” TO MAINTAIN ZERO DC VOLTS ACROSS PRIMARY SECONDARY VOLTAGE AREA “c” = AREA “d” TO MAINTAIN ZERO DC VOLTS ACROSS SECONDARY PRIMARY CURRENT SECONDARY CURRENT LT1170 SWITCH CURRENT SNUBBER DIODE CURRENT VOUT + Vf N 0V VIN a b 0V c d VOUT + Vf N • VIN ∆I IPRI 0 IPRI/N IPRI IPRI t = (IPRI)(LL) VSNUB 0 0 0 1 N* = 1/3 N* D3 25V 1W D2 MUR110 GND + + C4 0.047 µF VOUT –10V TO –26V 1170/1/2 TA04 R3 15k OPTIONAL SHUTDOWN R2 100k R1 200k C1 1 µF TANTALUM D1 1N914 C3 0.0047 µF C2*** 2 µF TANTALUM D2 VN2222 5V* L1** 50 µH VBAT* 3V TO 20V VIN VC FB VSW LT1172 E2 E1 GND D3 * ** *** D2, D3 = ER82.004 600mA SCHOTTKY. OTHER FAST SWITCHING TYPES MAY BE USED. VIN AND BATTERY MAY BE TIED TOGETHER. MAXIMUM VALUE FOR VBAT IS EQUAL TO THE NEGATIVE OUTPUT + 1V. WITH HIGHER BATTERY VOLTAGES, HIGHEST EFFICIENCY IS OBTAINED BY RUNNING THE LT1172 VIN PIN FROM 5V. SHUTTING OFF THE 5V SUPPLY WILL AUTOMATICALLY TURN OFF THE LT1172. EFFICIENCY IS ABOUT 80% AT IOUT = 25mA. R1, R2, R3 ARE MADE LARGE TO MINIMIZE BATTERY DRAIN IN SHUTDOWN, WHICH IS APPROXIMATELY VBAT /(R1 + R2 + R3). FOR HIGH EFFICIENCY, L1 SHOULD BE MADE ON A FERRITE OR MOLYPERMALLOY CORE. PEAK INDUCTOR CURRENTS ARE ABOUT 600mA AT POUT = 0.7Ω. INDUCTOR SERIES RESISTANCE SHOULD BE LESS THAN 0.4Ω FOR HIGH EFFICIENCY. OUTPUT RIPPLE IS ABOUT 200mVP-P TO 400mVP-P WITH C2 = 2µF TANTALUM. IF LOWER RIPPLE IS DESIRED, INCREASE C2, OR ADD A 10 Ω , 1µF TANTALUM OUTPUT FILTER. + TYPICAL APPLICATIO S |
类似零件编号 - LT1172HVI |
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类似说明 - LT1172HVI |
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