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DRV8825: Current waveform abnormality

user5812606
Prodigy 75 points
Part Number: DRV8825
Other Parts Discussed in Thread: DRV8424

I use DRV8825.

The current waveform does not take the form of a sine wave.

Increasing the pulse input speed will result in a sine wave.

Oscilloscope images are posted.

I tried 3 types of Decay mode.

Please tell me how to solve it.

  • 0
    TI__Guru 54665 points

    Hello!  

    Thank you for your post.

    1) Is this on your own board or EVM?

    2) If own board, can you post schematic?

    3) What is the supply voltage?

    4) Which decay mode is used for the plots you posted?

    5)  Motor parameters?

    If you are just beginning your design, we have much newer motor drivers that offer a SmartTune feature.  DRV8424/26/34/36 could be considered.

    Regards,

    Ryan