Patent ID: 6259618
Filing Date: 2001-07-10
Classification: H01L,H02M,H03K

Abstract:
A power chip set for a switching mode power supply, comprising:a control unit chip with a power terminal for inputting a driving voltage and a terminal connected to a system reference voltage; anda high voltage chip, including:switching power MOS transistor having a drain connected to an output terminal of the chip set, a source connected to the system reference voltage and a gate connected to the control unit, the switching power MOS transistor being turned on/off by a control signal outputted from the control unit;a junction field effect transistor coupled between the drain of the switching power MOS transistor and the power terminal of the control unit, for providing a start up voltage power for driving the control unit when the power chip set is turned on; anda current-sense power MOS transistor, coupled with the drain of the switching power MOS transistor, for detecting a drain current of the switching power MOS transistor.