Bipolar +/- 15V and 5V from Car Battery supply

Published:2013/3/20 1:11:00 Author:Ecco | Keyword: Bipolar, +/- 15V , 5V , Car Battery supply | From:SeekIC

This DC to DC Converter use Max 541 from Maxim, IC1 is a switching regulator that generates a 45-kHz signal that drives the gate of MOSFET Q1 BUZ71A from Motorolla. The sourceofthispower supplycomes froma 12Vcarbattery voltage. This DCtoDCconverter have an output +-15Vand5V. D1, D2, and D3 are Schottky diodes. The 5 V output is sensed as a reference; feedback to the chip turns off the gate signal to Q1 if the voltage rises above 5 V. T1 has Trifilar windings that assume about 2% regulation for a 10-to 100-mA load change on the ± 15-V supplies. R1/D4 provide overvoltage protection. T1 has a primary inductance of about 21 H. Core size should allow 4 A peak currents. The turn ratios are 111/2 turns each for the 15-V supplies, 111/2 turns for the primary, and four turns for the 5 V secondary. The efficiency is about 75%.



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