Protective circuit for protecting load against excessive input v

Details Protective circuit for protecting load against excessive input v Protective circuit for protecting load against excessive input v

1994-10-19

1996-12-17

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

361 33, 361101, 361 86, 361111, H02H 504

Patent

active

055859917

ABSTRACT:
A protective circuit intended to protect a load against excessive input voltage includes a depletion mode MOSFET, i.e., a MOSFET which is conductive when its V.sub.gs =0. Various alternative embodiments are described including those where the gate of the depletion mode MOSFET is tied to its source or to ground or some other reference voltage, where the gate of the MOSFET is switched at the onset of an excessive voltage condition, and where the gate of the MOSFET is controlled by negative feedback. The protective protecting IC loads in automobile form a condition known as load dump.

REFERENCES:
patent: 5027181 (1991-06-01), Larik et al.
patent: 5302889 (1994-04-01), Marsh
patent: 5517379 (1996-05-01), Williams et al.

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