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  1. 12-09-2012 #15
    Jonathan's Avatar
    Lives in Leicester (Home) or Nottingham University (2nd Home), United Kingdom.
    Jonathan
    Last Activity: 05-04-2020 Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 3,571. Received thanks 325 times, giving thanks to others 8 times. Referred 1 members to the community.
    Quote Originally Posted by jonbabbz View Post
    Dont worry mate, happy for the info. This one was recommended by Jonathan in another thread. Apparently it doesn't require one, (MB256)? I wasn't so sure - especially with the high amount of current that will be running through it. I suppose its better to be safe than sorry. Ill get one added. Cheeeeeeers
    I use the same one and it gets warm, but not hot or anywhere near it's temperature rating so I've not put a heatsink on mine. The peak current running through it is quite high, but here it's the mean current that matters (as that determines the power dissipation) and that is much lower. However if you've got a suitable heatsink lying around then you might as well use it.

    Here I'm running one stepper driver with a 3Nm motor at 4.09A from my lab PSU for testing, note the current:

    Click image for larger version.  Name: DSC08433.JPG  Views: 1492  Size: 177.7 KB  ID: 6832
    Last edited by Jonathan; 12-09-2012 at 03:46 PM. Reason: Added image
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.
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