Thermal protection circuit

Details Thermal protection circuit Thermal protection circuit

1996-04-26

1997-08-05

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 88, H02H 504

Patent

active

056548613

ABSTRACT:
A bandgap type, thermal protection circuit for an integrated circuit does not require the use of a comparator and a voltage divider of the bandgap voltage. By contrast, the simplified thermal protection circuit of the invention utilizes a first transistor for mirroring the current flowing through the bandgap circuit through a second transistor that is functionally connected between the output node and ground. The control terminal of the second transistor is connected to a temperature dependent voltage derived from the bandgap circuit. The crossing point between the characteristic of such a temperature dependent voltage and of the VBE characteristic of the second transistor versus temperature determine the required transition on the output node.

REFERENCES:
patent: 5099381 (1992-03-01), Wilcox

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