Circuitry for controlling load current

Details Circuitry for controlling load current Circuitry for controlling load current

1996-04-26

1998-08-18

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327 73, 327323, 327404, 327427, H03B 100

Patent

active

057962782

ABSTRACT:
Circuitry for controlling load current, in accordance with the present invention, utilizes a load drive transistor configuration operable to provide a first load current path having a first fraction of load current flowing therethrough and a second load current path having a second smaller fraction of load current flowing therethrough. The circuit includes a sense resistor associated with the load drive transistor to detect various load current threshold values. In order to reduce debiasing effects of the sense resistor upon the second load current path of the load drive transistor, a compensation resistor is provided between drive inputs associated with each of the two current paths. The compensation resistor has a compensation voltage established thereacross which is operable to negate the debiasing effect of the sense resistor on the load driving device.

REFERENCES:
patent: 5369308 (1994-11-01), Schoofs et al.
patent: 5408141 (1995-04-01), Devore et al.
patent: 5500619 (1996-03-01), Miyasaka
patent: 5650737 (1997-07-01), Eilley

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