Re: [CAD_CAM_EDM_DRO] re:L298 current spec

Another interesting note is never accidentally apply power with the L297
chip not properly in place. In my case the L298 let all it's smoke out :-((

----- Original Message -----
From: <ballendo@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Wednesday, November 22, 2000 4:27 AM
Subject: [CAD_CAM_EDM_DRO] re:L298 current spec


> Thanks Randy,My $.02:
>
> As the table says, the MAXIMUM DC output is 2A per channel(stepper
winding).
> And although that spec says 50V power supply, you had better be SURE that
your
> system will NEVER get above this, and the lower the voltage you can work
with,
> the better. Good board design WILL let you run these things at 40V. GOOD
HEAT
> SINKS ARE A MUST!! Fan - cooled too.
>
> I've always used a 24VAC Xfrmr, bridge rectified, 40Kmfd filter cap, for
about
> 34VDC. And my drives auto-idle when the step pulses stop... MANY people
HATE these
> chips, but they work fine for many others...
>
> DO respect that max Vs though! And don't forget about the "generator
effect" of a
> stepper "back-driven"!
>
> Hope this helps.
>
> Ballendo
>
> >I see a possible problem here, could some of you that are more
> >familiar with the 298 chip set confirm if the current drive of this
> >chip is 2 amps not 4 amps.
> >>I'm not familiar with the L298 chip, but just printed out the
application
> >>notes yesterday because the Dan Mauch 2A driver kit I recently built
uses
> >>it (and I like to have documentation on all my stuff...)
> >>The ABSOLUTE MAXIMUM RATINGS table says:
> >>Io Peak Output Current (each channel)
> >>-Non Repetitive (t=100us) 3A
> >>-Repetitive (80%on-20%off; t on=10ms) 2.5A
> >>-DC operation 2A
> >>Also
> >>Vs Power Supply 50V
> >>Vss Logic Supply Voltage 7V
> >>Best regards,
> >>Randy
>
>
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