100_kHz_MULTIPLE_OUTPUT_SWITCHING_POWER_SUPPLY

Published:2009/7/9 5:02:00 Author:May | From:SeekIC

The power supply uses two VN4000A 400－V MOSPOWER FETs in a half-bridge power switch configuration. Outputs availableare+5 V at 20A and±15V or±12 V at 1 A,Since linear three-termlinal regulators are used for the low-current outputs,either±12V or±15V can be made available with a simple change h the transformer secondary windings. A TL494 switching regulator IC provides pulse-width modulation control and drive signals for the power supply．The upper MOSPOWER FET,Q7,In the powerswitch stage is driven by a simple transformer driven by a simple transformer drive circuit．The lower MOS,Q6,smce it is ground referenced,is directly driven fromthe control IC．



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