US Patent 7098720 High impedance thermal shutdown circuit
Patent 7098720 was granted and assigned to National Semiconductor on August, 2006 by the United States Patent and Trademark Office.
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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.
US Patent 07098720 High impedance thermal shutdown circuit US Patent 7098720 High impedance thermal shutdown circuit
US Patent 07098720 High impedance thermal shutdown circuit
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