How to drive MOSFETs fast

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This might be of use to others that are living in a cave electronically
speaking, like me.

Recently spent a day trying to drive MOSFETs fast using bipolars. I'm after
a switch time of < 1uSec, and nothing I tried came close. In the end I
googled driving mosfets, and up came lots of ads for MOSFET drivers. Turns
out these things are a dream solution to the problem. They'll switch a half
bridge in a few tens of nanoseconds, with configurable deadtime. They'll
handle a bridge with both devices N-channel, and best of all, they'll work
with a rail that can be up to hundreds of volts. AND they can be obtained in
DIP-8 package. AND, they aren't expensive.

Re: How to drive MOSFETs fast

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Just make sure you supply them with a low impedance source - good thick
power supply rail and good ground. Decoupling write next to the Vcc and GND
pins is always advisable - as recommended in the datasheet.

If you want to kick 4A into the gate of a MOSFET, that current has to come
from somewhere. If the supply to the chip cannot provide it, your fantastic
MOSFET driver will not be as good as advertised..

Bill Naylor
Electronic Kits for Education and Fun

Re: How to drive MOSFETs fast

Bruce Varley wrote:

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Depending on the application they're very likely emitter followers. These can
charge Cg very quickly.


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