Patent ID: 8183848
Filing Date: 2012-05-22
Classification: H02M

Abstract:
1. A switching regulator for fixing an operating frequency comprising: a power stage circuit, for receiving an input voltage, and providing an output voltage according to a control signal, comprising: a reference voltage generator, for generating a reference voltage; a comparator, for outputting a comparison result according to the output voltage and the reference voltage; and a constant frequency compensating circuit, for outputting the control signal according to the comparison result, a phase signal and a compensating signal, comprising a charging capacitor having one terminal coupled to a ground, for charging; wherein the phase signal is corresponding to a voltage across the lower gate switch of the power stage circuit, the compensating signal is corresponding to the output voltage of the power stage circuit, and the constant frequency compensating circuit utilizes the phase signal to initialize a voltage of another terminal of the charging capacitor of the constant frequency compensating circuit.