Lower is usually better - if you imagine your MOSFET as a small capacitor,=
=20
part of the charge/discharge period of the gate through the capacitor=20
determines how long your MOSFET is in the linear conduction period for. If=
=20
you are using a fairly low frequency then you won't have much of an issue.=
=20
With higher switching frequencies you may have to drive your gates harder=20
and faster to get them out of the linear region.

Dom

-----Original Message-----=20
From: Neil
Sent: Thursday, January 7, 2016 7:33 PM
To: Microcontroller discussion list - Public.
Subject: [EE] MOSFET Q's...

Back at my MOSFET tinkering... I currently have the injector/solenoid
driver working nicely.  I added some protection diodes at the gate and
all's running very cool now.

Though I'm not seeing any ringing, I've been tinkering with series gate
resistors to see the effects.  From the various appnotes etc I've read
the only real consequence of having too much series gate resistance is
heat in the MOSFET due to staying in the linear region longer.  And
switching slower can only help reduce ringing, should any develop.  I've
tried various values starting from a few ohms, and have reached 100
ohms, and still not getting any heat from the MOSFET.  Is there anything
else I should worry about due to too much series gate resistance?

Cheers,
-Neil.

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