PWM signal generator for digital controlled power supply

摘要

A forward converter circuit includes a transformer having a primary winding and a secondary winding. A first transistor is coupled in series with the primary winding and a second transistor is coupled in series with the secondary winding. A control circuit generates PWM control signals for controlling operation of the first and second transistors. The control signals are generated responsive to source PWM signals processed through programmable delay timers to generate set/reset control signals which set an output PWM control signal duty cycle.