Voltage tracking reference for a power regulator

Details Voltage tracking reference for a power regulator Voltage tracking reference for a power regulator

2006-01-17

2008-11-18

Sterrett, Jeffrey L. (Department: 2838)

Electricity: power supply or regulation systems

Input level responsive

C323S901000, C363S049000

Reexamination Certificate

active

07453251

ABSTRACT:
A control circuit for a PWM switching power regulator including an error amplifier and an amplifier filter circuit. The error amplifier has a first input receiving a reference signal, a second input receiving an output sense signal, and an output providing a compensation signal used to control PWM switching. The amplifier filter circuit has an input receiving a ratio-metric tracking signal and an output providing the reference signal to the input of the error amplifier. The control circuit may include a resistive voltage divider for providing the tracking signal. The amplifier filter circuit may be implemented as a transconductance amplifier having an input receiving the tracking signal and an output coupled to a capacitor. The transconductance amplifier may have a relatively small current drive capacity and its output may have a relatively slow and weak response to changes of the tracking signal.

REFERENCES:
patent: 5781000 (1998-07-01), Saeki et al.
patent: 5783935 (1998-07-01), Kyung
patent: 5917313 (1999-06-01), Callahan, Jr.
patent: 6538417 (2003-03-01), Marty et al.
patent: 6969977 (2005-11-01), Smith
patent: 6998829 (2006-02-01), Solie
National Semiconductor, LM31700 Datasheet, Jun. 2004, p. 3.

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