Patent ID: 7239119
Filing Date: 2007-07-03
Classification: H02M

Abstract:
1. A switching regulator circuit, comprising: a switch coupled between an input of the power supply and an energy transfer element of the power supply, the energy transfer element to be coupled between the input and an output of the power supply; and a controller circuit coupled to a control terminal of the switch, the controller circuit coupled to receive a feedback signal representative of an output level of the power supply, the controller circuit to switch the switch on and off at a switching frequency to regulate the output level of the power supply, the controller having a maximum switching frequency that is independent of the input of the power supply, the maximum switching frequency to be limited to a first switching frequency when the load does not exceed a moderate power level threshold value, the maximum switching frequency to be limited to a second switching frequency that is higher than the first switching frequency when the load is greater than the moderate power level threshold value.