100Khz Multiple Output Switching Power Supply Circuit

The 100Khz Multiple Output Switching Power Supply Circuit Diagram uses two VN4000A 400-V MOS POWER FETs in a half-bridge power switch configuration. Outputs available are + 5 Vat 20 A and ±15 V (or ±12 V) at 1 A. Since linear three-terminal regulators are used for the low-current outputs, either ±12 V or ±15 V can be made available with a simple change in the transformer secondary windings.


A TU94 switching regulator IC pro Vides pulse-width modulation control and drive signals for the power supply. The upper MOS POWER FET, Q7. in the power switch stage is driven by a simple transformer drive circuit. The lower MOS. Q6, since it is ground referenced. is directly driven from the control !C.


100Khz Multiple Output Switching Power Supply Circuit Diagram