Patent ID: 9343978
Filing Date: 2016-05-17
CPC Classification: H02M

Claim Text:
1. A controller for use in a power converter that includes a switch, the controller comprising: an input terminal to be coupled to receive a feedback signal representative of an output of the power converter; an oscillator configured to generate a first signal to determine a duration of a switching cycle period of the switch; and a logic circuit coupled to the input terminal and to the oscillator, wherein the logic circuit is configured to generate a second signal to control switching of the switch to regulate power delivered to the output of the power converter in response to the feedback signal and in response to the first signal, wherein the logic circuit is configured to generate the second signal to control a peak switch current of the switch during the switching cycle period according to either a first mode of operation or a second mode of operation, wherein the logic circuit is configured to vary the peak switch current of the switch in the first mode of operation in response to the feedback signal indicating that an output load is greater than a threshold and, wherein the logic circuit is configured to keep the peak switch current of the switch at a substantially constant value in the second mode of operation in response to the feedback signal indicating that the output load is less than the threshold.