Patent ID: 6324079
Filing Date: 2001-11-27
Classification: H01F,H02M

Abstract:
A power supply package for providing pulse-width modulated control of a power converter, comprising:a first terminal for coupling to a primary winding of a transformer;a second terminal for coupling to an activation gate of an external power switch;a third terminal for coupling to a ground reference;a fourth terminal for coupling to a combined source of operating power and feedback signal, the feedback signal based on an output load voltage across a secondary winding of the transformer;an internal power switch having an input coupled to the first terminal, an output coupled to the third terminal, and an activation gate; andPWM control circuitry responsive to the feedback signal, the control circuitry including gate drive circuitry having a first output coupled to the internal switch activation gate and a second output coupled to the second terminal, the gate drive circuitry configured to drive the internal and external power switches.