PWM step-down MOSFET regulator

Details PWM step-down MOSFET regulator PWM step-down MOSFET regulator

1990-07-20

1992-04-28

Stephan, Steven L.

Electricity: power supply or regulation systems

Input level responsive

323282, 323351, G05F 500

Patent

active

051091860

ABSTRACT:
A regulated step-down switching circuit for a DC-to-DC converter of a power supply includes a pulse width modulation IC, a MOS-FET, a zener diode, a plurality of diodes, capacitors, resistors, and an inductor. The drain of the MOS-FET is connected to a power supply, with its source being connected to a power output lead. The gate of the MOS-FET is connected to one of the transistors of the pulse width modulation IC. A series combination of a diode and capacitor is connected between the source and the drain of the MOS-FET. A second diode and resistor series combination is connected to the junction of the diode and capacitor forming the first series combination and supplies a voltage to the transistor within the pulse width modulation IC as well as being connected to a parallel combination of a zener diode, a capacitor and a diode parallel branches. The other ends of the parallel branches are connected to the power input lead and the pulse width modulation IC. Through these arrangements, when the voltage rises, it will actuate the whole circuit to operate.

REFERENCES:
patent: 4061461 (1977-04-01), Roland
patent: 4760324 (1988-07-01), Underhill
patent: 4959764 (1990-09-01), Bassett

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