Soft-start voltage regulator circuit

Details Soft-start voltage regulator circuit Soft-start voltage regulator circuit

2005-11-29

2005-11-29

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S284000, C323S901000

Reexamination Certificate

active

06969977

ABSTRACT:
A voltage regulator includes a soft-start circuit, an error amplifier, an output stage, a voltage divider, and a soft-start switch. The output stage is arranged to provide an output voltage from an input voltage and an error signal. The voltage divider is arranged to provide a feedback signal from the output voltage. The error amplifier is arranged to provide the error signal from a soft-start reference voltage and the feedback signal. The soft-start circuit is arranged to provide the soft-start reference voltage from a reference voltage. If the voltage regulator is enabled, the soft-start reference voltage ramps toward the reference voltage until the soft-start reference voltage reaches the reference voltage. The soft-start switch is coupled across the inputs of the error amplifier. If the voltage regulator is disabled, the soft-start switch is closed. Closing the soft-start switch causes the soft-start reference voltage to track the decaying output voltage during disable.

REFERENCES:
patent: 5625279 (1997-04-01), Rice et al.
patent: 5978195 (1999-11-01), Goder et al.
patent: 6633193 (2003-10-01), Halamik et al.
patent: 6650099 (2003-11-01), Mitamura et al.
patent: 6737845 (2004-05-01), Hwang
patent: 6871289 (2005-03-01), Pullen et al.
L. Wofford, “Meeting ISDN Requirements in a Switch Mode Power Converter”, IEEE, 1992, pp. 463-470.

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