Short circuit protection circuit for a low-side driver circuit

Details Short circuit protection circuit for a low-side driver circuit Short circuit protection circuit for a low-side driver circuit

1995-10-05

1997-12-09

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 93, 361100, 361115, H02H 504

Patent

active

056966580

ABSTRACT:
A short circuit protection circuit which has a first short circuit protection circuit in parallel with a second short circuit protection circuit is disclosed. The first short circuit protection circuit includes a sense resistor and a comparator for detecting the short circuit, and a transistor and current source for turning off the low side driver when the short circuit is detected. The second short circuit protection circuit includes a current mirror, zener diode, transistor, and current source connected in series. The second short circuit protection circuit is in parallel with the first short circuit protection circuit. The second short circuit protection circuit accelerates the turn-off of the low-side driver with out affecting the stability of the circuit.

REFERENCES:
patent: 4427902 (1984-01-01), Hickman et al.
patent: 5432665 (1995-07-01), Hopkins

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