Patent ID: 9450478
Filing Date: 2016-09-20
CPC Classification: H02M,Y02B

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