Patent ID: 7876075
Filing Date: 2011-01-25
Classification: H02M

Abstract:
1. A control circuit for a power converter, which is suitable for generating a stable voltage control signal to control ON/OFF of a power switch of a synchronous rectified buck converter with an inductor and an output capacitor, comprising: a difference generating circuit receiving an output voltage and a reference voltage of said synchronous rectified buck converter and acquiring a voltage difference between the output voltage and the reference voltage; a pulse modulation circuit generating a pulse width modulation signal according to said voltage difference; a time-optimal control (TOC) circuit detecting a change of said output voltage, creating a time-optimal control signal and a select signal when said change exceeds a default value, said time-optimal control signal being based on a voltage slew rate detected at the time of said change exceeding said default value to estimate a time interval T a multiplexer being based on said select signal to select said pulse width modulation signal or said time-optimal control signal being output as said stable voltage control signal.