SELF－OSCILLATING_FLYBACK－SWITCHING_CONVERTER

Published:2009/7/9 4:52:00 Author:May | From:SeekIC

Regulation is provided by taking the rectified output of the sense winding and applying it as a bias to the base of Q2 via zener D1. The collector of Q2 then removes drive from the gate of Q1. Therefore, if the output voltage should increase, Q2 removes the drive to Q1 earlier, shortening the on time, and the output voltage will remain the same. Dc outputs are obtained by merely rectifying and filtering secondary windings, as done by D5 and C4.



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