High impedance thermal shutdown circuit

Details High impedance thermal shutdown circuit High impedance thermal shutdown circuit

2006-08-29

2006-08-29

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

C327S538000, C323S907000, C323S315000, C361S103000

Reexamination Certificate

active

07098720

ABSTRACT:
A thermal shutdown circuit board integrated circuit device. The thermal shutdown circuit includes a current source for receiving a current bias and generating an output current in accordance therewith. The current source is configured to produce the output current in a manner proportional to absolute temperature. A current mirror is coupled to the current source. The current mirror is configured to mirror the output current from the current source and is configured to have a high output impedance. A thermal shutdown transistor is coupled to control one output of the current mirror. The thermal shutdown transistor is also coupled to receive the output current and shutdown the output current at a temperature threshold in a manner dependent on shutdown circuit operating temperature.

REFERENCES:
patent: 5359236 (1994-10-01), Giordano et al.
patent: 5448174 (1995-09-01), Gose et al.
patent: 5654861 (1997-08-01), Pennisi
patent: 6580261 (2003-06-01), Dow
patent: 6717530 (2004-04-01), Schmidt et al.

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