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DRV8873: The VM voltage ripple

Zoey Wu
Expert 5855 points
Part Number: DRV8873

Hi team,

my customer has tested the 1.4V voltage ripple in VM pin and will this influence the normal work of DRV8873 ? Could u kindly help to explain what is the possible reason? They didn't measure the voltage ripple in DVDD pin.

  • 0
    TI__Mastermind 37683 points

    Hello Zoey,

    Having this amount of ripple on VM most likely means there is not enough bulk capacitance to suppress low frequency ripples. Is it possible to share the schematic and waveform showing VM and OUT voltage when driving motor.

    Regards,

    Pablo Armet