公开(公告)号：US20240223069A1

公开(公告)日：2024-07-04

申请号：US18325022

申请日：2023-05-29

Applicant: Richtek Technology Corporation

Inventor： Fu-To Lin ,  Chang-Jung Fu

IPC: H02M1/088 ,  H02M1/00 ,  H02M1/32 ,  H02M3/157

CPC classification number: H02M1/088 ,  H02M1/0009 ,  H02M1/32 ,  H02M3/157

Abstract: A switching power converter for converting an input power to an output power includes a power stage; and a conversion control circuit which includes: a current limit control circuit for comparing a current monitor signal and a sensing signal limit threshold to generate a current limit control signal, wherein the current monitor signal is related to an output current of the output power; and a PWM control circuit for generating a PWM signal according to an output voltage of the output power for controlling the power stage to generate the output power. The first state of the PWM signal has a first constant time. When the current limit control signal indicates that the output current exceeds a current limit threshold, the PWM control circuit controls a switching frequency of the PWM signal to operate at a fixed frequency. The fixed frequency is lower than a predetermined frequency limit.