Hello,

How about measuring the voltage drop across the HEXFET in the H-bridge? Is
Rds(on) fairly stable, or does it fluxuate widely with increase temperature?
(I don't have a HEXFET to test with).

Comments.

Donovan


> The easiest way to add current limiting is to add a small resistor in
series
> with the H bridge.  It should only drop a small fraction of the supply
> voltage at full current.  Just enough to trigger a comparator to the
> accuracy you need.  This goes into the PIC as an input, which causes it to
> shut down the H bridge, go into error mode, or whatever.

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