Stepper motor drivers

[TOM_HUSSEY at HP-Canada-om1.om.hp.com]

Hi,

Look at an LM18293. I have used it for similar applications (but I can't
remember the specs right now). -Tom Hussey

BTW it is a 16 pin dip. Could it be the same IC as the stock?


> application.  What sort of driver circuit should I use?  I expected
this to
> be a subject covered in the archives, considering that some IAC valves
are
> really stepper motors.
> 
> My motor has a single winding.  (It only runs in one direction.)  To
step, it
> needs to have about 12 volts applied in alternating polarities.  The
steady
> state current is about 50 ma.  Some testing showed that the fastest it
can
> step (full steps) is 50 to 60 Hz, depending on voltage.  I'll be
stepping it
> at a maximum of 20 Hz, but typically at 7 Hz.
> 
> I've only managed to find the following easily available single DIP
solutions
> that can source and sink the current levels needed:  A dual power
audio
> amplifier like the LM1877 used in a saturated output configuration. 
Or a 556
> timer with no timer components - the timer outputs can source and sink
200 ma.
> Ideally, any solution would work across the automotive temperature
range.
>