• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 30 subscribers
  • Views 1900 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Can I run multiple identical DRV8825 setups in parallel?

Peter Wilson60
Prodigy 60 points
Other Parts Discussed in Thread: DRV8825, DRV8711, BOOST-DRV8711, DRV8711EVM

I need to run a 6A stepper motor off of a chopper drive. However, I have easy access to your DRV8825 motor drivers on identical breakout boards, and am wondering if I could just use 3 of those in parallel instead of getting a whole new driver series. Is this possible in full stepping or wavedriving? If I were to try it, would I be at risk for damaging the drivers?

I would be fine with undercurrenting the motor by a bit, I'm not too picky.

  • 0
    TI__Guru** 114905 points
    Hi Peter,

    It is not possible to run three in parallel. There are several reasons, but the two main reasons are the part to part variation of the chopping current comparator and the internal clock. Both of these variations will cause the outputs to switch from drive to current regulation at different times.

    For 6A, the DRV8711 is recommended. There is a BOOST-DRV8711 available for evaluation.
  • 0 in reply to Rick Duncan
    Prodigy 60 points
    Thank you: the BOOST-DRV8711 board looks like what I would want. However, I noticed that the DRV8711 board looks like it is meant to be set upon another board which provides a whole bunch of fancy features, none of which I need. Could I simply use that DRV8711 board by wiring into the STEP and DIR lines without using the other board?

    Also, do you happen to have a 6A version of that board?
  • 0 in reply to Peter Wilson60
    TI__Guru** 114905 points
    Hi Peter,

    To operate the BOOST-DRV8711, there are other signals that must be controlled. The SPI interface must be used to enable the device and set the configuration. The SLEEPn pin must be used to awaken the device.

    The DRV8711EVM can provide up to 10A.