Current-limiting circuitry

Details Current-limiting circuitry Current-limiting circuitry

2006-03-21

2006-03-21

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S276000, C323S316000, C323S908000

Reexamination Certificate

active

07015680

ABSTRACT:
A field effect transistor (FET) driver circuit includes an error amplifier for providing a FET control signal and a current limiting amplifier for preventing excessive current flow through the FET. The current limiting amplifier generates an overcurrent signal when an excessive current is detected. In response to the overcurrent signal, a voltage control circuit adjusts the voltage at the output of the error amplifier to turn off the FET. Meanwhile, a pulldown circuit at an input of the error amplifier adjusts the voltage provided to that input to cause the error amplifier to provide an output voltage that also tends to turn off the FET. If a buffer is present at that input to the error amplifier, a second pulldown circuit is placed at the input to the buffer to maintain a stable unity gain across the buffer.

REFERENCES:
patent: 5731692 (1998-03-01), Garcia
patent: 5821740 (1998-10-01), Hodgins et al.
patent: 6496345 (2002-12-01), Smith

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