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DRV8662: Abnormal waveform of DRV8662 with Load

Cherry Zhou
Mastermind 22235 points
Part Number: DRV8662

Hi team,

DRV8662‘s output is normal on condition of no piezo load, but output abnormal with piezo load

Attached are the waveform with and no piezo load!

SCH is same to the DRV8662EVM schematic

piezo load is 3.7uF

Gain1=Gain2=0

Could you help check this case? Thanks.

Best Regards,

Cherry

  • 0
    TI__Mastermind 19465 points

    Hi Cherry,

    How does the boost voltage/PVDD look in this case? is the PVDD stable, or is it collapsing?

    My thought is that perhaps the boost cannot supply the necessary current. If that is the case you can try a few things, 

    -decrease Rext,

    -use larger boost inductor, 

    -use larger capacitor at output of the boost

    Regards,

    Arthur