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Original question:

DRV8434S: Thermal vias

DRV8434S: About output waveform

Gabriel Wang1
Genius 4715 points
Part Number: DRV8434S

Tool/software:

Dear Expert

Could u hlep to check 

1.Is the waveform normal? Can it be further optimized and improved?
2.Can the operating noise of the motor be optimized?

Motor's A1 &B1 voltage waveform

Motor's A1 &B1 voltage waveform

A1 zoom in

  • 0
    TI__Mastermind 44615 points

    Hi Gabriel,

    Those waveforms you shared look what is expected from this driver. However these are AOUTx and BOUTx voltage waveforms which does not provide any information about the motor coils A and B current. Please look at the A and B coil waveforms using a current probe. This will reveal if the drive is optimal or not for the step rate and current setting. Thanks.

    Regards, Murugavel 

  • 0 in reply to Murugavel4637
    Genius 4715 points

    Dear Murugavel

    Two different waveforms of current are used to drive motors with two different frequencies.

  • 0 in reply to Gabriel Wang1
    TI__Mastermind 44615 points

    Hi Gabriel,

    Thanks for sharing the current waveforms. They all look normal. The sine waveform distortion happens when the VM is not sufficient to driver the desired target current through the coils at faster step rates. For example the triangular current waveform will become sinusoidal if VM is increased from the present voltage level. Of course it must be less than the max recommended operating voltage of the device which is 48V. The triangular current waveform will have audible noise the sine waveform will let the motor run smoothly with low audible noise.

    Regards, Murugavel