AC 110V-DC 12V/8A switching power supply

Published:2011/4/23 3:59:00 Author:May | Keyword: AC 110V-DC 12V/8A, switching power supply | From:SeekIC

In this circuit, it generates about 150V DC voltage after the AC voltage passing bridge rectifying and capacitor filtering. It is chopped by two power MOS transistor BUZ41A with 50kHz. Then it changes to 18V AC voltage by transistor. Finally, it is full wave rectifying and filtering to output 12V DC voltage. Integrated circuit TDA4718 in the circuit can generate 100kHz high frequency oscillation. It can limit the voltage drop on total power supply resistor by utilizing its current limiting circuit. The output of integrated circuit TDA4718 can drive power transistor by CMOS six-inverter 4049. Transformer data: n1=n2=67 turns, 30×0.1mm copper lacquered wire (double) ; n3=n4=9 turns, 2×60×0.1mm copper lacquered wire (double) . Choke data: 10 turns, 4×30×0.1mm copper lacquered wire.



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