±15_V_AND_5_V_CAR_BATTERY_SUPPLY

Published:2009/7/10 20:52:00 Author:May | From:SeekIC

IC1is a switching regulator that generates a 45-kHz signal that drives the gate of MOSFET Q1.D1,D2, and D3 are Schottky diodes. The 5-V output is sensed as a reference; feedback to the chip turns offthe gate signal to Q1 if the voltage nses above 5 V． T1 has Trifilar windings that assume about 2% regulation fr a 10-to 100-mA load change on the±15－V supplies, R1/D4 provide overvoltage protecti. T1 has a pnmary inductance ofabout 21 μH. Coreslze should allow 4-A peak currents. The turn ratios are 11 1/2 turns each for the 15-V supplies. 11 1/2 turns for the pnmary, and four turns for the 5-V secondary. The efficiency is about 75%.



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