Thermal shutdown trip point modification during current limit

Details Thermal shutdown trip point modification during current limit Thermal shutdown trip point modification during current limit

2007-11-27

2007-11-27

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

Reexamination Certificate

active

11232071

ABSTRACT:
A thermal shutdown circuit for protecting a main FET that conducts a load current ILOAD. A reference circuit provides a temperature current proportional to temperature. A thermal sensor circuit has a resistor and generates an output signal signaling thermal shutdown when the voltage generated across the resistor by the temperature current exceeds a predetermined value. A sense FET having a size smaller than the main FET conducts a sense current ISENSE proportionately smaller than ILOAD. A current mirror mirrors a scaled current proportional to ISENSE to be conducted through the resistor, the scaled current being scaled so as to cause the voltage generated across the resistor to exceed the predetermined value when ILOAD exceeds a predetermined value.

REFERENCES:
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patent: 5128823 (1992-07-01), Fujimoto et al.
patent: 5737170 (1998-04-01), Moyer
patent: 5801573 (1998-09-01), Kelly et al.
patent: 6816351 (2004-11-01), Frank et al.
patent: 2006/0056485 (2006-03-01), Hartley

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