Patent ID: 6348784
Filing Date: 2002-02-19
Classification: H02M,H03K

Abstract:
A series regulator circuit operative in a switching voltage power supply, comprising:an n-channel MOSFET transistor serving as a regulator element of the series regulator circuit and having a drain terminal, a source terminal, and a gate terminal, wherein the drain terminal connects with an input voltage section of the power supply and the source terminal connects with an output voltage section of the power supply; a gating circuit applying a gating voltage to the gate terminal relative to the drain terminal for establishing states of current conduction and current cut-off between the drain and the source terminals of the transistor; and a biasing circuit interconnecting the gating circuit with the drain terminal for establishing an offset potential of the gate terminal relative to the drain terminal during the state of current conduction, the offset potential counteracting a gate-to-source threshold voltage for reduction of a voltage drop between the drain terminal and the source terminal during the state of current conduction with a corresponding reduction in power dissipation of the regulator element during operation of the switching power supply.