Patent ID: 7511461
Filing Date: 2009-03-31
Classification: H02M,Y02B

Abstract:
1. A switching regulator control circuit, comprising: a first reference voltage generator circuit; a second reference voltage generator circuit; a third reference voltage generator circuit; a dividing resistor for dividing an output voltage of the switching regulator; a chopping wave generator circuit; an error amplifier for inputting a voltage of the first reference voltage generator circuit and a voltage divided by the dividing resistor; a first comparator for receiving a voltage obtained by dropping an output of the error amplifier by a voltage of a first constant voltage source, a voltage of the third reference voltage generator circuit, and a voltage of the chopping wave generator circuit; a second comparator for receiving a voltage obtained by dropping an output of the error amplifier by a voltage of a second constant voltage source, a voltage of the second reference voltage generator circuit, and the voltage of the chopping wave generator circuit; a synchronous rectification switching circuit that is controlled based on an output of the first comparator; and a step-up switching circuit that is controlled based on an output of the second comparator.