stepper driver

Discussion in 'General Electronics Chat' started by rnramsamy, Aug 7, 2009.

  1. rnramsamy

    Thread Starter New Member

    Aug 7, 2009
    hi guys,

    i have a 5v unipolar stepper motor and im very undecided about what driver circuit to use. my microcontroller outputs approx 20mA and i need my driver circuit to amp it to 500mA. i dont really want to use an H-bridge simply because i'll need two since its a unipolar stepper.any help??
  2. jpanhalt


    Jan 18, 2008
    Welcome to AAC.

    You can run a small, logic level mosfet directly from a microcontroller. By small, I mean one that will handle at least 10 amp. You may need a gate resistor (about200 ohm) to limit the max current drawn from the MCU as it charges the mosfet gate. As discussed in the thread above, the main issue is turn-on time and heating.

    You actually are starting a new thread by adding your question to a very old existing thread. An AAC moderator will probably move this post to its own thread, which improves organization and will increase the liklihood of getting more responses.

  3. beenthere

    Retired Moderator

    Apr 20, 2004