Switch mode power supply system with dual ramp compensation associated controller and method

Patent metadata

Field	Value
Publication number	US-8970194-B2
Application number	US-201213706273-A
Country	US
Kind code	B2
Filing date	Dec 5, 2012
Priority date	Dec 5, 2011
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

A switch mode power supply system has a constant on-time signal generator, a logic circuit, a feedback circuit, a first ramp signal generator, a second ramp signal generator, a switch circuit having a power switch, and a comparator. A feedback signal from the feedback circuit is compensated by the first ramp signal generator, and a reference signal is compensated by the second ramp signal generator. The comparator compares the compensated feedback signal with the compensated reference signal to indicate an off time of the power switch while the constant on-time signal generator decides the on-time of the power switch.

First claim

I claim:

1. A controller for controlling a switch mode power supply system, wherein the switch mode power supply system comprises a switch circuit that comprises a power switch, and wherein the controller comprises:
a feedback circuit, coupled to an output of the switch mode power supply system, configured to generate a feedback signal that is based on an output signal of the switch mode power supply system;
a first ramp signal generator, coupled to the switch circuit, configure…

Assignees

• Chengdu Monolithic Power Sys

Inventors

• Li Yike

Classifications

• G05F1/575 Primary

  Physics · mapped topic

• H02M1/0025

  Electricity · mapped topic

• H02M3/158

  Electricity · mapped topic

• H02M3/1588

  Electricity · mapped topic

• Y02B70/10

  Cross-Sectional Technologies · mapped topic