Patent ID: 6026005
Filing Date: 2000-02-15
Classification: H02M,Y02B

Abstract:
A switching power converter, comprising:a switching transformer having a primary winding and a secondary winding, the secondary winding having first and second voltage nodes across which a winding voltage having a phase and a variable duty cycle is impressed;a first synchronous rectifier transistor coupled from the first voltage node to a common node;a second synchronous rectifier transistor coupled from the second voltage node to the common node; anda driver circuit operable to receive the winding voltage and produce first and second drive signals to the first and second synchronous rectifier transistors, respectively, the driver circuit including at least a first phase lock loop circuit operable to receive a signal corresponding to the winding voltage and produce an output signal leading the phase of the winding voltage, the output signal for producing at least one of the first and second drive signals.