Patent ID: 6418039
Filing Date: 2002-07-09
Classification: H02M,Y02B

Abstract:
A switched mode power supply having an output terminal, comprising:a transformer having a set of primary and secondary windings; a primary power transistor coupled to the primary windings of the transformer; a PWM controller coupled to and providing a switching control signal to the primary power transistor; a first switched synchronous rectifier having at least one terminal connected to the secondary windings of the transformer; a clock signal generation circuit that generates a clock signal; and a digital control circuit for controlling the first switched synchronous rectifier, the digital control circuit having an input terminal for accepting a digital input value and a clock input that receives the clock signal, the digital control circuit being structured to generate a driving control signal directly related to the clock signal and the digital input value, and provide the driving control signal to the first switched synchronous rectifier.