Thermal protection circuit for an integrated circuit subscriber

Details Thermal protection circuit for an integrated circuit subscriber Thermal protection circuit for an integrated circuit subscriber

1989-12-04

1991-01-01

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361 93, 307310, H02H 504

Patent

active

049823078

ABSTRACT:
A thermal protection circuit for an integrated circuit subscriber line interface is disclosed. The thermal protection circuit monitors the temperature of the integrated circuit and develops an output voltage signal that shuts-down the integrated circuit when a specific temperature is exceeded. The thermal protection circuit includes first and second current networks arranged to each develop first and a second currents respectively, of substantially the same value. The second current develops a reference voltage which is applied to an output transistor. When the base-emitter junction voltage of the output transistor is less than or equal to the reference voltage, the transistor begins to operate. This increases the current flowing through the first current network which is replicated in the second current network. The increased current flowing in the second current network increases the reference voltage, thereby, fully operating the output transistor and developing the output voltage signal.

REFERENCES:
patent: 4574205 (1986-03-01), Nagano

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