AC 220V-DC 5V/10A switching power supply

Published:2011/4/20 2:11:00 Author:May | Keyword: AC 220V-DC 5V/10A, switching power supply | From:SeekIC

This circuit is energy supply by 220V AC network. It adds to SIPMOS FET BUZ80 and transformer primary winding n1 after passing radio interference filter, GL2 rectifier and 220μF filter. The duty factor control of FET is finished by integrated circuit TDA4718. Its duty factor limiting must less than 0.5 in order to limit the size of output voltage. Winding n2 can make transformer magnet core to degaussing after every pulse. Thereby it can improve the efficiency of transformer. Transformer data: n1=112 turns, 15×0.1mm copper lacquered wire; n2=112 turns, 12×0.04mm copper lacquered wire; n3=1 turn, shield thin foil. Choke data: 10 turns, 4×30×1mm copper lacquered wire.



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