Protective device for a power element of an integrated circuit

Details Protective device for a power element of an integrated circuit Protective device for a power element of an integrated circuit

1976-09-17

1978-02-14

Miller, J D

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 56, 330207P, H02H 720

Patent

active

040743349

ABSTRACT:
A protective device limiting the current flow through a power transistor 11 in a final stage of an integrated circuit comprises, as part of that circuit, a normally nonconductive shunt transistor 31 which is turned on by a monitoring transistor 22 whenever the collector current I and the collector-emitter voltage V.sub.CE of the power transistor reach values beyond a protective curve 52 plotted on a current/voltage diagram. The base-emitter circuit of the monitoring transistor 22 is connected across an output resistor R.sub.2, in series with the power transistor 11, via a diode 21 of logarithmic conduction characteristic, that diode being also connected across the power transistor in series with a voltage-sensing network. This network includes a voltage divider R.sub.3, R.sub.5 in series with a Zener diode 33, the voltage divider being connected in parallel with a switching transistor 35 whose base is tied to a tap of the divider.

REFERENCES:
patent: 3668545 (1972-06-01), Recklinghausen
patent: 3786364 (1974-01-01), Wheatley, Jr.
patent: 3992678 (1976-11-01), Suzuki

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