Patent ID: 6545451
Filing Date: 2003-04-08
Classification: H02M,Y02B

Abstract:
A load-dependent frequency modulation circuit applicable for a switching power system, comprising:a control integrated circuit, including a clock signal generation terminal and a feedback input terminal, wherein the clock signal generation terminal is used to generate a clock signal; a feedback circuit, to process an output of the switching power system and to obtain a feedback signal fed back to the feedback input terminal; and a clock control generation circuit, electrically connected to the feedback input terminal to adjust a clock frequency generated by the clock signal generation terminal according to a control signal generated by the feedback signal, wherein the clock control generation circuit further comprises: a clock control circuit, electrically connected to to feedback input terminal to change the control signal according to the feedback signal, wherein the clock control circuit comprises one selected from the group consisting of a resistor, a capacitor, and a inductor; and a clock generation circuit, electrically connected to the clock control circuit to receive the control signal, and to adjust the clock frequency generated by the clock signal generation terminal according to the control signal.