Output driver circuit

Details Output driver circuit Output driver circuit

1987-03-11

1988-11-22

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361101, 361103, 361 91, 323278, 323285, 307475, H02H 3093, H02H 504

Patent

active

047870079

ABSTRACT:
In an output driver semiconductor circuit, a protection circuit is used to protect the output NPN transistor from being destroyed. The protection circuit comprises an excessive current detector for detecting an excessive collector current of the output NPN transistor, an excessive temperature detector for detecting an excessive temperature of the output transistor, and an OR gate for taking a logical sum of output signals of the detectors. According to the output signal of the OR gate, a base current of the control NPN transistor is controlled, so that a base current of the output transistor is kept below a predetermined value.

REFERENCES:
patent: 3959713 (1976-05-01), Davis et al.
patent: 4438473 (1984-03-01), Cowley et al.
patent: 4528608 (1985-07-01), Anderson et al.
patent: 4555742 (1985-11-01), Gray et al.

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