DC-to-DC converter with soft-start error amplifier and associate

Details DC-to-DC converter with soft-start error amplifier and associate DC-to-DC converter with soft-start error amplifier and associate

1997-12-19

1999-06-29

Riley, Shawn

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323901, G05F 140

Patent

active

059173130

ABSTRACT:
A DC-to-DC converter includes an error amplifier; a ramp generator for generating a ramp signal at the first input of the error amplifier independent of the output of the error amplifier and so that the output of the error amplifier ramps up at a relatively slow rate to avoid overshoot of the desired output voltage of the converter during the start-up phase of the converter; and a ramp disable circuit for disabling the ramp signal upon reaching a value corresponding to the normal operating phase of the converter. The DC-to-DC converter preferably includes at least one power switch and pulse width modulation (PWM) control circuit cooperating with the power switch to provide a desired output voltage of the converter. The ramp generator in one embodiment comprises a current source and an external capacitor connected thereto. In yet another embodiment, the ramp generator may be provided by a staircase ramp generator comprising an amplifier and an integrating capacitor connected thereto. A power-on-reset (POR) circuit is also preferably provided for discharging the integrating capacitor until the start-up phase of the converter.

REFERENCES:
patent: 3766410 (1973-10-01), Elsaesser
patent: 3995228 (1976-11-01), Pass
patent: 4453193 (1984-06-01), Huang et al.
patent: 4634956 (1987-01-01), Davis et al.
patent: 5084811 (1992-01-01), Maige et al.
patent: 5142217 (1992-08-01), Gontowski, Jr.
patent: 5148115 (1992-09-01), Koakutsu et al.
patent: 5264782 (1993-11-01), Newton
patent: 5532645 (1996-07-01), Fagnani et al.

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