Method and circuit for providing adjustable control of short cir

Details Method and circuit for providing adjustable control of short cir Method and circuit for providing adjustable control of short cir

1985-04-01

1990-01-09

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 86, 361 91, 361 87, 361107, 323278, H02H 902

Patent

active

048932116

ABSTRACT:
A method for limiting short circuit current flow in a Field Effect Transistor (FET) to limit the power dissipated therein includes sensing a rise in the drain-to-source voltage of the transistor and clamping the gate-to-source voltage to a predetermined adjustable value thereby reducing the magnitude of the short circuit current flow to within the safe operating characteristics of the device. A comparator switch circuit is responsive to the drain-to-source voltage of the FET exceeding a reference voltage value for clamping the gate-to-source voltage to a predetermined reduced voltage. A trimmable resistive network is connected between the gate and the source electrode of the transistor for adjusting the gate to source clamped voltage potential to compensate for variations in transistor transconductances from one transistor to the next that they may be used in conjunction with the electronic circuitry.

REFERENCES:
patent: 3582713 (1971-06-01), Till
patent: 3851218 (1974-11-01), York
patent: 4021701 (1977-05-01), Davies
patent: 4180768 (1979-12-01), Ferraro
patent: 4254372 (1981-03-01), Moore, Jr.

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