Overcurrent protection circuit with fast current limiting...

Details Overcurrent protection circuit with fast current limiting... Overcurrent protection circuit with fast current limiting...

2006-07-11

2006-07-11

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including protection means

C330S20700P

Reexamination Certificate

active

07075373

ABSTRACT:
An overcurrent protection circuit for a power transistor includes a transconductance amplifier and a bias current circuit. The transconductance amplifier receives a first signal indicative of the magnitude of the load current conducted by the power transistor and a reference voltage and provides a second signal for controlling the load current. The transconductance amplifier further provides a third signal having a first logical state indicating normal operation and a second logical state indicating an overcurrent condition at the power transistor. The bias current circuit provides an output bias current to the transconductance amplifier in response to the third signal where the output bias current has a nominal current value in normal operation and an increased current value in an overcurrent condition. In this manner, a boost current is provided to the transconductance amplifier to increase the current limit response time when an overcurrent condition is detected.

REFERENCES:
patent: 5485341 (1996-01-01), Okado et al.
patent: 5675268 (1997-10-01), Petty et al.
patent: 5892665 (1999-04-01), Matsumoto et al.
patent: 5903422 (1999-05-01), Hosokawa
patent: 6304108 (2001-10-01), Inn
patent: 6801058 (2004-10-01), Jiandong
patent: 6801419 (2004-10-01), Fukui
patent: 2005/0184809 (2005-08-01), Can et al.

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