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DRV8889-Q1: EMI problem

Neal Zhu
Expert 2470 points
Part Number: DRV8889-Q1

Hi

EMI test, in the low frequency band, the EMI is high,by combining the motor wire and shield with the test frequency of 22kHz,

I'm sure it's a 22 kHz frequency, which is when the TOFF is 22 kHz, how to solve the EMI problem？Thanks！

Datasheet 7.3.5CurrentRegulation Below,

DRV8889 EMI waveform:

DRV8889-4coil test waveform:

Test the frequency of the first channel waveform.At about 22 KHZ；

  • 0
    TI__Guru 56650 points

    Neal,

    Assume you talk about the input side conductive EMI. Do you test is with an EVM or your own board?

    1. Add more capacitors at input;

    2. If the input has pi filter, increase the inductor value.

    3. What decay mode do you use? Can you change it to the ripple control decay mode?