Low side driver circuit with diagnostic output

Details Low side driver circuit with diagnostic output Low side driver circuit with diagnostic output

1997-05-12

1999-05-11

Ton, My-Trang Nu

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327432, 327434, H03K3/00

Patent

active

059031735

ABSTRACT:
A low side driver circuit includes a command voltage source, a first switching transistor having a base connected to the command voltage source, an emitter connected to ground, and a collector connected to a second switching transistor base. The second switching transistor includes an emitter connected to a first reference voltage. A power transistor includes a gate connected to the second switching transistor collector through a first resistor, a drain connected to an electrical energy source through a load, and a source connected to ground through a sense resistor. A second resistor is connected between the power transistor gate and ground. A diagnostic circuit portion including a first comparator and a second comparator establishes a diagnostic output voltage based upon the voltages at the power transistor drain, gate and source for indicating fault conditions of the driver circuit.

REFERENCES:
patent: Re35041 (1995-09-01), Rossi et al.
patent: 4634903 (1987-01-01), Montorfano
patent: 5434527 (1995-07-01), Antone
patent: 5438489 (1995-08-01), Judy et al.
patent: 5467240 (1995-11-01), Williamson et al.
patent: 5534814 (1996-07-01), Archer
patent: 5546043 (1996-08-01), Pollmeier
patent: 5646561 (1997-07-01), Fanini et al.

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