Patent ID: 6522113
Filing Date: 2003-02-18
Classification: H02M,Y02B

Abstract:
A switching regulator comprising:a first power switch and a second power switch coupled in series, the first power switch being coupled to an input voltage; a first winding magnetically coupled to a second winding, the first winding coupled to a node between the first power switch and the second power switch; a control circuit operative to control a duty cycle of an input signal provided to the first power switch and the second power switch resulting in the generation of a primary output voltage at the first winding and an auxiliary output voltage at the second winding; and an auxiliary switch coupled to the second winding that rectifies the auxiliary output voltage generated by the second winding, the auxiliary output voltage having a switch input control being coupled to the node and the auxiliary switch being selected to have a voltage drop that substantially cancels the voltage drop of the second power switch when both the second power switch and the auxiliary switch are closed.