Hi Vasile,

That method is not uncommon. It is used to speed the MOSFET turnoff. It
also gives some overvoltage protection to the gate.

Best regards, Bob


On Tue, Nov 10, 2015, at 09:54 AM, embedded systems wrote:
> Hi all,
> I've seen today an unusual MOS driver, see the attach.
> The IN signal comes from an emitter repeater.
> The weird thing is that it works even looks wrong (at least for me).
> When IN is high, it seems D1 is turning on based on the small current
> flow
> into the gate. When IN is low, the gate-source capacitor is discharged
> through Q1.
>=20
> Please comment if need one more resistor...
>=20
> thx,
> Vasile

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