Switching regulator with programmable output levels using a...

Details Switching regulator with programmable output levels using a... Switching regulator with programmable output levels using a...

2007-05-15

2007-05-15

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

Input level responsive

Using a linearly acting final control device

C323S284000, C323S299000

Reexamination Certificate

active

11381092

ABSTRACT:
A switching regulator provides programming output current control through a single input terminal by modifying the reference voltage in the control loop of the switching regulator. The switching regulator includes a first input terminal receiving a program input voltage indicative of a desired output current, a voltage divider receiving a first reference voltage and providing a second reference voltage at a first node between the first and second resistors and a third reference voltage at a second node between the second and third resistors, and a precision active pulldown circuit coupled to receive the program input voltage and operative to pull down the second reference voltage at the first node in response to the program input voltage. In operation, the third reference voltage is used in the control loop of the switching regulator to control the output current of the switching regulator in response to the program input voltage.

REFERENCES:
patent: 6204654 (2001-03-01), Miranda et al.
patent: 6281668 (2001-08-01), Sudo
patent: 6300751 (2001-10-01), Sudo
patent: 6593725 (2003-07-01), Gallagher et al.
patent: 7002331 (2006-02-01), Sae-Ueng et al.
patent: 7095215 (2006-08-01), Liu et al.

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