Limitation of current absorption under short-to-plus unpowered c

Details Limitation of current absorption under short-to-plus unpowered c Limitation of current absorption under short-to-plus unpowered c

1994-02-07

1996-05-07

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, H02H 320

Patent

active

055152244

ABSTRACT:
A transistor in an output stage has an emitter connected to a supply rail and a collector connected to an output node. The transistor is protected against the effects of accidental shortcircuiting of the output node of the output stage with a positive pole of a battery while the circuit is unpowered, by a protection transistor of the same type as the transistor to be protected. The protection transistor has an emitter connected to the base of the output transistor, a collector connected to the output node of the output stage, and a base connected through a biasing resistance to the supply rail on the output stage. The protection transistor and an interdigitated structure of the transistor may be formed within the same pocket, thus reducing the required area.

REFERENCES:
patent: 5038054 (1991-08-01), Peyre Lavigne et al.

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