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DRV8889-Q1: accuracy control issues

ansel wang
Prodigy 130 points
Part Number: DRV8889-Q1

   HI ：

  We are now using DRV8889 to drive a bipolar stepper motor, which is used in HUD products. When the motor drives the reflector to move back and forth multiple times, there will be accuracy control issues. Please help analyze from the perspective of the DRV8889 driver chip, which factors are related to it?

   We now default to using 100% current full step (two-phase excitation)。The step frequency is 500Hz.

  • 0
    TI__Mastermind 44725 points

    Hi,

    Thank you for your question. our expert will reply in a day or two.

    regards

    Shinya Morita

  • 0 in reply to Shinya Morita
    TI__Mastermind 44595 points

    Hi Ansel,

    Thank you for posting in this forum. What is the setting used for full-scale current IFS? Because you are using FS mode and 500 Hz step rate chances are that you are stepping close or at the mechanical resonance frequency of the stepper motor and system. Solution would be to use microstep mode to minimize resonance.

    Could you please capture the current waveform and share with us? What is the DECAY mode used? Can you try with Smart Tune Dynamic Decay mode or Mixed modes? Thanks.

    Regards, Murugavel