Compensation offset adjustment scheme for fast reference...

Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...

Reexamination Certificate

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Details

C323S222000, C323S284000

Reexamination Certificate

active

07489121

ABSTRACT:
A PWM control circuit for a voltage regulator including a compensation network, a ramp generator providing a ramp voltage, an offset adjust circuit and a comparator circuit. The compensation network senses the output voltage, receives a reference voltage, and outputs a compensation voltage. The offset adjust circuit adjusts a selected one of the ramp voltage and the compensation voltage based on the reference voltage. The comparator circuit compares the compensation voltage with the ramp voltage and provides a PWM signal for controlling the output voltage. The offset adjust circuit may generate an offset voltage based on the reference voltage and a gain G of the voltage regulator. The offset adjust circuit may subtract the offset voltage from either the ramp voltage or the compensation voltage to provide an adjusted voltage to the comparator circuit.

REFERENCES:
patent: 5689176 (1997-11-01), Deloy
patent: 6522115 (2003-02-01), Greitschus
patent: 7038514 (2006-05-01), Leith et al.
patent: 7135841 (2006-11-01), Tomiyoshi et al.
patent: 2007/0013356 (2007-01-01), Qiu et al.

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