INTRODUCING JITTER TO A SWITCHING FREQUENCY BY WAY OF MODULATING CURRENT LIMIT

摘要

A controller for use in a power converter includes a switch controller coupled to a power switch coupled to an energy transfer element. The switch controller is coupled to receive a current sense signal representative of a drain current through the power switch. The switch controller is coupled to generate a drive signal to control switching of the power switch in response to the current sense signal and a modulated current limit signal to control a transfer of energy from an input to an output of the power converter. A current limit generator is coupled to generate a current limit signal. A jitter generator is coupled to generate a jitter signal. An arithmetic operator circuit is coupled to generate the modulated current limit signal in response to the current limit signal and the jitter signal.

主权项

1. A controller for use in a power converter, comprising:
a switch controller coupled to a power switch coupled to an energy transfer element, wherein the switch controller is coupled to receive a current sense signal representative of a drain current through the power switch, wherein switch controller is coupled to generate a drive signal to control switching of the power switch in response to the current sense signal and a modulated current limit signal to control a transfer of energy from an input of the power converter to an output of the power converter; a current limit generator coupled to generate a current limit signal; a jitter generator coupled to generate a jitter signal; and an arithmetic operator circuit coupled to receive the current limit signal and the jitter signal, wherein the arithmetic operator circuit is coupled to generate the modulated current limit signal in response to the current limit signal and the jitter signal.