At 01:29 PM 2/28/2004 -0500, you wrote:
>Never rely on internal diodes to do the job of external snubbing. There's
>no way
>the substrate of the ULN device can handle the spike supression of any motor.
>The internal diodes are there as a last resort, not the first line of defense.
>~Rick

Can you predict how much the peak current through the catch diodes (which
are not substrate diodes, BTW) will conduct, given the motor coil current
of, say, 170mA per phase?

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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