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LT1072MJ8 Datasheet(PDF) 10 Page - Linear Technology |
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LT1072MJ8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page 10 LT1072 1072fc Flyback Converter Negative to Positive Buck-Boost Converter External Current Limit R1 1k VIN NOTE THAT THE LT1072 GND PIN IS NO LONGER COMMON TO VIN (–) LT1072 • TA06 C1 1000pF C2 RS R2 + – VIN VSW FB VC GND LT1072 Q1 C3 0.47µF VOUT 5V 1.5A D2 D1 OPTIONAL FILTER 1 1 3 N* N* = C2 0.15µF C4 25µF* VIN 20 TO 30V R3 1.5k REQUIRED IF INPUT LEADS ≥ 2" OPTIONAL TO REPLACE R4 AND C3 * ** C1 500µF R4 1k ** R1 3.74k R2 1.24k VIN VSW FB VC GND LT1072 L2 10µH C4 200µF VSNUB VOUT + Vf IPRI IPRI IPRI (IPRI) (LL) VSNUB IPRI N ∆I VIN 0V 0V 0 0 0 0 CLAMP TURN-ON SPIKE PRIMARY FLYBACK VOLTAGE = LT1072 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 LT1070 SWITCH CURRENT SNUBBER DIODE CURRENT VOUT + Vf N N • VIN t = a b c d LT1072 • TA04 + + VIN VSW FB VC GND LT1072 C2 1000µF C1 0.22µF C4 25µF* R2 1.24k R3 2.2k R1 11.3k VOUT 12V, 0.5A VIN –12V D1 L1** 220µH Q1 * ** REQUIRED IF INPUT LEADS ≥ 2" PULSE ENGINEERING 52626 OPTIONAL INPUT FILTER L3 OPTIONAL OUTPUT FILTER L2 C3 LT1072 • TA05 + + TYPICAL APPLICATIO S |
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