> I know I'm not
> trying to pull too much current - the motor only uses around 200mA

Are you sure?  This is possible, but sounds rather thin.  What voltage is
the motor supposed to receive at full on?  What is the power supply voltage?
What current can the power supply deliver at the design voltage?

> and the P
> and N mosfets are rated at 2.0 and 4.0 amps, repectively. Using only one
of
> the mosfets, switching in only one direction, I have no problem running
the
> motor.

Huh?!!!  Something is very wrong here.  The motor should be off unless TWO
of the FETs from opposite corners of the H are on.  Only one FET out of the
four on should cause nothing to happen.  This is a good clue as to what is
wrong with your wiring.  Find the cause to this and fix it before
proceeding.  You may have a shorted FET somewhere, or more likely one that
is incorrectly wired so that it ends up conducting when it shouldn't.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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