Patent ID: 8259472

Claim:
A switching power converter comprising: a transformer including a primary winding coupled to an input voltage and a secondary winding coupled to an output of the switching power converter; a switch coupled to the primary winding of the transformer, current through the primary winding being generated while the switch is turned on and not being generated while the switch is turned off; and a controller configured to generate a control signal to turn on or turn off the switch, the switch being turned on responsive to the control signal being in a first state and the switch being turned off responsive to the control signal being in a second state; wherein after a transition from a first output load condition to a second output load condition, the controller is further configured to generate the control signal at an intermediate frequency for a period of time during the second output load condition, the intermediate frequency being lower than a first frequency corresponding to the first output load condition but higher than a second frequency corresponding to the second output load condition; wherein the controller is further configured to generate the control signal at the second frequency corresponding to the second output load condition responsive to the expiration of the period of time.