Voltage-clamped integrated circuit

Details Voltage-clamped integrated circuit Voltage-clamped integrated circuit

1989-09-05

1990-12-04

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 57, 361 51, 361 93, 361101, 361104, 361111, H02H 320

Patent

active

049757989

ABSTRACT:
An automobile alternator regulator integrated circuit having a voltage-supply or -sense node (6) for connection to an external voltage, and a voltage clamp comprising: a pnp bypass transistor (Q1) having a base electrode, an emitter electrode coupled to the node and a collector electrode coupled to ground; a resistor (R1) connected between the base electrode and the node; a Zener diode (Z1-Z4) connected between the base electrode and ground for enabling the bypass transistor when the voltage at the node exceeds a predetermined value, whereby the voltage at the node is clamped to a voltage no greater than the predetermined value; and a fuse (F1) connected between the node and the emitter electrode so as to provide a subsequently identifiable cause of failure if the fuse becomes blown due to excess voltage while allowing subsequent operation of the integrated circuit if the clamp means fails but another part of the integrated circuit remains functional.

REFERENCES:
patent: 4616286 (1986-10-01), Breece
patent: 4740859 (1988-04-01), Little

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