Introducing jitter to a switching frequency by way of modulating current limit

A power converter, comprising:

• an energy transfer element coupled between an input of the power converter and an output of the power converter;
• a power switch coupled to the energy transfer element and the input of the power converter;
• a sense circuit coupled to generate a feedback signal representative of the output of the power converter;
• and
• a controller coupled to the power switch, wherein the controller includes:
• a switch controller coupled to the power switch, wherein the switch controller is coupled to receive a current sense signal representative of a drain current through the power switch, wherein 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 the input of a power converter to the output of the power converter;
• a control modulator coupled to generate a first signal;
• a jitter modulator coupled to generate a second signal, wherein the second signal is a periodic signal having a modulation time period that is greater than a switching period of the drive signal;
• and
• an arithmetic operator circuit coupled to the control modulator and the jitter modulator, wherein the arithmetic operator circuit is coupled to generate the modulated current limit signal in response to the first signal and the second signal.