5V-+12V and -15V DC converter

Published:2011/4/20 22:00:00 Author:May | Keyword: 5V-+12V and -15V, DC converter | From:SeekIC

When this circuit is in stable state, capacitor C3 has about 12V voltage, transistor is breaking over, its collector potential is only few tenths of millivolt. So D1 is blocked off. The currents flow to load through transformer secondary winding and transistor T2. Output voltage is feeding back to the base of T1 through BZX79C6V8. The changing of output voltage leads to the change of collector current. And output voltage is stable by the changing of square wave's duty factor. Main technical data: Input voltage: 5V; output voltage when non load: U1=12.0V, U2=-15.6V; Output voltage when the load is 1.5W: U1=11.5V, U2=-13.8V. Transformer data: n1 winding: 98turns, 0.16mm copper enamel wire; n2 winding: 18turns, 0.16mm copper enamel wire; n3 winding: 44turns, 0.25mm copper enamel wire.



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