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DRV8833: Motor signal lines

Cherry Zhou
Mastermind 22235 points
Part Number: DRV8833

Hi Team,

Stepper motor drive chips such as AOUT1, AOUT2, BOUT1 and BOUT2 of DRV8833, are the four motor signal lines required a capacitor in parallel with each signal to ground? For example, a parallel capacitor value of 102, 22 pf, and so on are used to filter out some clutter or optimize EMI emissions.

(1) If not necessary, could you please elaborate more on the reason?

(2) Will there be some potential risk for paralleling capacitors?

(3) Could you help look into below script and give some design recommendations for EMI emission suppression?

Could you help check this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Guru 55605 points

    Hello,

    Snubber capacitors from each output to GND or across the outputs are common for radiated EMI suppression.  The only concern is the size of the capacitor.  If the capacitor is too large or the parallel combination of the capacitance is too large, the device can go into a protection state...over-current protection (OCP).  This is due to the large current that can flow into the capacitor when the output switches and given by this equation: I = C * dv/dt.  

    Regards,

    Ryan