Patent ID: 9246392
Filing Date: 2016-01-26
CPC Classification: H02M

Claim Text:
1. A controller for use in a power converter, comprising: a drive circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from a power converter input to a power converter output; an input for receiving an enable signal including enable events responsive to the power converter output, wherein the drive circuit is coupled to turn ON the power switch in response to the enable events and turn OFF the power switch in response to a power switch current reaching a current limit threshold; and a current limit threshold generator coupled to receive the drive signal from the drive circuit and to vary the current limit threshold in response to the enable events of the enable signal, wherein the current limit threshold generator is coupled to increase, within a current limit threshold range, the current limit threshold by a fixed increase amount during a fixed time period in response to an end of each ON time of the power switch, and wherein the current limit threshold generator is coupled to begin decreasing, within the current limit threshold range, the current limit threshold at a decrease rate after the fixed time period after the end of each ON time of the power switch.