Integrated circuit protection circuit

Details Integrated circuit protection circuit Integrated circuit protection circuit

1983-07-07

1986-06-10

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 93, H02H 902

Patent

active

045946337

ABSTRACT:
An integrated circuit protection device for use with a voltage regulator used to drive an integrated circuit to prevent damage to the integrated circuit which goes into a "latch up" condition. The integrated circuit protection device comprises a first switching circuit, connected to the output of the voltage regulator for selectively connecting the output of the voltage regulator to ground and a second switching circuit, connected to the input and the output of the voltage regulator and to the first switching circuit, for detecting a "latch up" condition and for selectively activating the first switching circuit upon detection of a "latch up" condition, whereby the first switching circuit connects the output of the voltage regulator to ground and resets the integrated circuit to prevent damage thereto. A predetermined time after the "latch up" condition is detected, normal operation is automatically restored. In another embodiment, the first switching circuit is included in an adjustable voltage regulator, but is still controlled by the second switching circuit as described hereinbefore. In still another embodiment the protection circuit monitors the input current drawn by a voltage regulator and cuts the current thereto when the current exceeds a predetermined value caused by the "latch up" condition of the integrated circuit. The output of the voltage regulator drops to zero and clears the integrated circuit.

REFERENCES:
patent: 3332006 (1967-07-01), Worrell et al.
patent: 3553530 (1971-01-01), Gregson
patent: 3573553 (1971-04-01), Mietz
patent: 3832573 (1974-08-01), Ver Planck et al.
patent: 3988643 (1976-10-01), Morris
patent: 4012683 (1975-03-01), Ferro et al.
patent: 4040116 (1977-08-01), Sheldon
patent: 4127885 (1978-11-01), Adam et al.
patent: 4322770 (1982-03-01), Sendelweck
patent: 4351021 (1982-09-01), Morihisa et al.
patent: 4353105 (1982-10-01), Black
"SCR Latch-Up" ICAN-6525, RCA COS/MOS Integrated Circuit Book, Aug. 1978, p. 621.

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