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  1. #1
    Join Date
    Nov 2008
    Posts
    1

    Allegro A3986

    I'am building a stepperdriver with an Allegro A3986 driver
    and IRFZ24V N-channel powerfet's

    Do anyone know how to calculate the series resistors for the gates on these fet's

  2. #2
    Join Date
    May 2006
    Posts
    2415
    Unfortunately the 3986 does not perform well in microstepping mode, you may want to try something else, did you read through the 3986 thread ? link :

    http://www.cnczone.com/forums/showth...=24699&page=54

    In the last couple of pages Mariss from Gecko has offered to program CPLD's to do basically the same job of the 3986, only properly. At five bucks each (though in 100 quantities) it is pretty cheap.

    Cheers.

    Russell.

  3. #3
    Join Date
    Jun 2008
    Posts
    2
    You must buy fet irlz44n (vgs 1-2 v)

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