Line driver circuit having a protective circuit against excess c

Details Line driver circuit having a protective circuit against excess c Line driver circuit having a protective circuit against excess c

1981-10-13

1983-11-01

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

330207P, 330298, 361101, H02H 308

Patent

active

044133006

ABSTRACT:
A line driver circuit having a protective circuit against excess currents, which includes a protective transistor for limiting the output current of an output-stage emitter-follower transistor. A detecting means for detecting the output current of the emitter-follower transistor and a pull-up transistor for pulling up the base potential of the protective transistor are provided. Before the output current becomes too large, the detecting means detects the output current to turn on the pull-up transistor. Then the base potential of the protective transistor is pulled up to turn on the protective transistor. As a result the base current of the emitter-follower transistor is decreased, so that the emitter-follower transistor is protected from being thermally destroyed.

REFERENCES:
patent: 3678408 (1972-07-01), Suzuki
patent: 3796943 (1974-03-01), Nelson et al.
"A Programmable operational amplifier" Elektron. Prak. (Germany) vol. 11, No. 11 (11/1976).

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