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  1. #1
    Join Date
    Mar 2010
    Posts
    40

    Question about current limit

    hi,
    I want to build current limit for stepper motor driver using comparator, and i have some question :
    Should I use flip flop with outbot of comparator?
    What is the frequency that comes out of the comparator?
    What should I do if the frequency of the pc (step signals) higher than the frequency of the comparator?

    thanks

  2. #2
    Join Date
    Nov 2008
    Posts
    24
    Here's some information about limiting stepper motor current by using a sense resistor voltage and the pic reference voltage, with an internal pic comparator, to turn the output off and on when limiting.

    Look near bottom of page for chopper current limiting.

    Limit Current to Boost Stepper-Motor Torque | Machine Design

    gk

  3. #3
    Join Date
    Mar 2010
    Posts
    40
    hi
    I want to use lm339. any information about this?
    i want to limit current for 5 amp stepper motor and my power supply 24v 30amp
    thanks

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