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DRV8812: DRV8812 drive motor produce jitter

Raymond He
Expert 1990 points
Part Number: DRV8812
Other Parts Discussed in Thread: DRV8412, DRV8841, , DRV8872

dear

1, APHASE/BPHASE pin input PWM signal frequency 20KHZ, when the input PWM signal duty cycle is unchanged, the output AOUTx/BOUTx is changing, which shows that when the drive motor signal is in a static position, the actual motor works with jutting, we compared the DRV8412 xPHASE signal and xOUT motor output waveform, there is no similar phenomenon, please refer to the attached video and picture for details.

2. Please help to check the difference between DRV8812, DRV8841 and DRV8412 in working principle and using method.

any advice? Thanks in advance

  • 0
    TI__Guru 56650 points

    Raymond,

    To filter out the input signal noise, the input pin has an filter. The difference is due to the input noise filter design

    Some devices' input signal will synchronize with the internal clock and pass the output, such as: DRV8872, DRV8812. So, the output jitter is about 200ns. It is normal.

    DRV8800/1; DRV8844 and DRV8412 or DRV8432 input signal don't need to synchronize with the internal clock.

    DRV8812 uses the clock synchronization method to filter out the input glitch noise. DRV8412, DRV8841 doesn't use the clock synchronization method the filter out the input glitch noise.