Patent ID: 7613019
Filing Date: 2009-11-03
Classification: H02M,Y10S

Abstract:
1. A switching regulator circuit, comprising: a switch to be coupled to an energy transfer element; a controller coupled to the switch to control switching of the switch to regulate an output of a power supply in response to a feedback signal; a current sensor included in the controller and including first and second comparators coupled to compare a current in the switch with first and second current limits, respectively, the controller to open the switch for a remainder of a current switching cycle of the switch until a next switching cycle of the switch if the current in the switch is greater than the first current limit, wherein the first and second comparators are coupled to compare the current in the switch with their respective current limits independent of the feedback signal; and a frequency adjuster included in the controller and coupled to the second comparator, the frequency adjuster to adjust an oscillating frequency of an oscillator included in the controller, wherein the frequency adjustor is coupled to adjust the oscillating frequency by delaying the next switching cycle of the switch by a first amount of time if the current in the switch is greater than the second current limit and by delaying the next switching cycle of the switch by a second amount of time if the current in the switch is greater than the second current limit for a second consecutive switching cycle, wherein the second amount of time is different than the first amount of time.