LOAD RESPONSIVE JITTER

摘要

A controller for use in a power converter includes a comparator to compare a current sense signal with a current limit to generate a comparator output signal representative of whether a switch current has reached the current limit. A drive circuit controls switching of a power switch to regulate an output of the power converter in response to a feedback signal and the comparator output signal. The drive circuit turns off the power switch in response to the comparator output signal. A current limit generator generates an initial current limit in response to the feedback signal. The current limit is responsive to the initial current limit. A light load sense circuit outputs a light load signal in response to sensing a light load condition of the power converter. A modulation circuit outputs a modulation signal and modulates the initial current limit in response to the light load signal.

主权项

1. A controller for use in a power converter, comprising:
a comparator coupled to compare a current sense signal representing a switch current conducted by a power switch of the power converter with a current limit, wherein the comparator is coupled to generate a comparator output signal representative of whether the switch current has reached the current limit; a drive circuit coupled to generate a drive signal to control switching of the power switch to regulate an output of the power converter in response to a feedback signal representative of an output of the power converter and the comparator output signal, wherein the drive circuit turns off the power switch in response to the comparator output signal; a current limit generator coupled generate an initial current limit in response to the feedback signal, wherein the current limit is responsive to the initial current limit; a light load sense circuit coupled to output a light load signal in response to sensing a light load condition of the power converter; and a modulation circuit coupled to output a modulation signal and modulate the initial current limit in response to the light load signal.