Simple power MOSFET low side driver switch-off circuit with limi

Details Simple power MOSFET low side driver switch-off circuit with limi Simple power MOSFET low side driver switch-off circuit with limi

1994-02-22

1996-06-11

Nelms, David C.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Accelerating switching

327389, 327427, 327108, 327110, H03K 1704, H03K 1716, H03K 17687, H03K 300

Patent

active

055259251

ABSTRACT:
An output circuit includes a power MOSFET with a gate connected to a plurality of diodes, the plurality of diodes forming a diode string. A resistor is connected in parallel with the diode string. A switch is connected between the opposite end of the diode string and circuit ground. A control terminal of the switch is connected to the circuit input and determines whether the circuit is turned on or turned off. An inductive load is connected to a drain terminal of the power MOSFET. The opposite end of the inductive load is connected to a power supply. A source terminal of the power MOSFET is connected to circuit ground thus providing a low-side driver circuit configuration. The resistor and diode string, connected in parallel, along with the switch provide a two-phase, soft turn-off mechanism which allows the power MOSFET to dissipate the energy stored in the inductive load without the power MOSFET entering breakdown, therefore improving the circuit's reliability.

REFERENCES:
patent: 4504779 (1985-03-01), Haman
patent: 4540899 (1985-09-01), Pelly
patent: 4890020 (1989-12-01), Bird
patent: 4904889 (1990-02-01), Chieli
patent: 5027018 (1991-06-01), Kindlmann et al.
patent: 5204561 (1993-04-01), Rischmuller
patent: 5313109 (1994-05-01), Smith

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