Nicholas Irias wrote:
>
> I'm trying to use a PIC to drive several 24 volt DC motors, using an
> H-bridge so I can get forward and reverse with speed control.  I'm just
> wondering what the easiest way is to drive the MOSFETS.
>
> It's easy to come up with a way to drive the low-side MOSFETS, since they
> only need 10 volts, but the high side MOSFETs need 34 volts at the gate.
> And at least the Maxim gate driver chips will only do 18 volts.
>
> So far, the only suitable driver I have found is the IR2110 from
> International Rectifier.  Is this a good way to drive the H-bridge, or is
> there a better, simpler way to make this work?

Check out Bob Blick's H-Bridge circuit. He uses Darlingtons and BJT's
instead of MOSFETs.

http://www.bobblick.com/bob/projects/hbridge/index.html

We're implementing a variation of this design here. We're changing the
Darlingtons to BJT's and adding flyback protection diodes.

Scott