Resistive feed rail generation in a power supply

Details Resistive feed rail generation in a power supply Resistive feed rail generation in a power supply

2006-04-18

2006-04-18

Tran, Sinh (Department: 2646)

Telephonic communications

Subscriber line or transmission line interface

Power supply

C307S080000

Reexamination Certificate

active

07031463

ABSTRACT:
A circuit provides current from a high voltage output to a low voltage output through a resistor when a load at the low voltage output is removed. The resistor provides current to keep the VBL voltage above the set point of a switching regulator that provides output power to the VBL output. Accordingly, the regulator's output stage provides a switched 0% duty cycle output and saves power until a load is presented again. Presenting a signal to either a shutdown circuit or a sleep pin shuts down the entire controller until a load is presented again. A zener diode is used to clamp the VBL at a voltage higher than the set point of the controller to ensure that the controller operates with a 0% duty cycle output while in a no-load condition. The circuitry can be configured to operate in either a positive or negative powering scheme.

REFERENCES:
patent: 6362541 (2002-03-01), Kawata
patent: 6404076 (2002-06-01), Matsuda et al.

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