High gain driver circuit and method

Details High gain driver circuit and method High gain driver circuit and method

1989-04-06

1990-01-30

Beha, Jr., William H.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323280, 323901, G05F 1575

Patent

active

048975940

ABSTRACT:
Circuitry for providing unlimited, self-adjusted drive current and suitable for power applications is described. A four terminal high efficiency, high gain driver circuit including enabling circuitry is provided along with a positive feedback loop that is designed to provide unlimited drive current which automatically adjusts to the load requirement. The drive circuit includes a startup transistor, drive regulation transistors, predrive transistors, a driving or output transistor, and a current splitter. The drive regulation transistors and the current splitter provide a positive feedback loop which supplies current to the predrive transistors and the driving transistor. Under typical loading conditions, feedback loop operation will cause the collector to emitter voltage of the driving transistor to decrease which causes the drive regulation transistors to saturate. This condition decreases positive feedback loop drive which in turn regulates the predrive current to the level required by the load. Under short circuit output conditions, the drive regulation transistors, together with the current splitter and the sensing resistor, regulate the output drive current to a predetermined level.

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patent: 4684878 (1987-08-01), Giordano
patent: 4704572 (1987-11-01), Melbert

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