Re: [CAD_CAM_EDM_DRO] need components for stepper drivers

Hi Bryan

I'm using Allegro's 3977, max 35 V 2.5 A with up to eight stepping.
They SEEM to work fine but don't go too close to 35 V unless you like
smoke, detonations, and melted pins. I'm running 31 V and 1.2 A with
quarter stepping. Socketed PLCC chips with a ground plane heat sink on the
top side of the board (and a small heat sink clamped to the top of chip for
my insecurity); hardly gets warm. Circuit is very similar to the one on
their site, although point to point wired. They do have samples available.

Jeff


At 09:51 AM 9/28/02 -0700, you wrote:

>I'm looking for components with which to build a microstepping,
>current chopping, bipolar motor driver for currents up to 2 amps. The
>L297/298 only support half stepping, the 3955 only support 1.5 amps,
>and the SLA7044 is unipolar. Does anyone have experience with
>something else?

Jeff Demand
http://www.aztec-net.com/~jdemand