Roman Black wrote:
>
> Dan Michaels wrote:
> >
> > Roman wrote:
> > >Hi, still looking for a h-bridge chip with
> > >low-saturation voltage at 2A but preferably
> > >3A to 4A. I also would like high package power
> > >dissipation if possible.
> > >
> >
> > I wonder about this, Roman. I've been looking around at
> > specs, and seems MOSFET sat voltage is a direct function
> > of current pulled, so difficult to get low-sat.
> > Eg, .2v/5A = 0.04 ohms. Awfully small Rds. Maybe have
> > to stay with bjts.
> >
> > - danM


Dan, i've just found a low-sat motor driver chip for
a fairly reasonable price.

LMD8201 (national semiconductor)

3A cont (6A peak) 55v 25w
($7.40 US in 250q)
DMOS power stage 0.33 ohm Rds (2v total sat at 3A)
Similar package to L298 chip

Has internal clamp diodes and a few other nice
power driver thingies. This is one of the nicest
little mid power h-bridges i've seen.
However it's only one h-bridge, not two like
in the L298.

It can be seen at their page (with pricing and datasheet)
http://www2.national.com/pf/LM/LMD18201.html

:o)
-Roman

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