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Original question:

DRV10983: I2C Mode Speed Control

DRV10983: Control Coefficient

Naizeng Wang
Expert 5470 points
Part Number: DRV10983

Hi team,

In datasheet, it says that "In applications where noise makes it difficult to control the commutation optimally, the CtrlCoef[1:0] can be used to attenuate the feedback used for closed loop control. The loop will be less reactive to the noise on the feedback and provide for a smoother output." .

Does the feedback mean phase current information？ Although the nosie is attenuated, the useful current information is also attenuated. If so, how can it provide for a smoother output?

thanks,

Nison

  • 0
    TI__Mastermind 24415 points

    Hi Naizeng,

    When control coefficient is set less than 1, then the device averages more number of current samples to attenuate the noise. When more samples are averaged, the noise also averages out and the output will be the mean of a large sample of current signals. Imagine there are 100 current samples out of which 10 samples generate noise. If all 100 samples are averaged (by setting control coefficient less than 1), then the effective output will have less noise. Having said that, setting lesser control coefficients is not recommended as there will be delay in the signal path. This delay can be compensated by tuning the lead time.

    Regards,

    Vishnu.