DRV8711: Current noise when the pulse input stops

Cherry Zhou

Part Number: DRV8711

Hi team,

When the motor runs to a stop, the current noise of the motor is high, how to eliminate or improve this? And the configuration is as follows:

SPI_DRV8711_Write(0x01,0x01BA);
delay_ms(1);
SPI_DRV8711_Write(0x00,0x0E21);
delay_us(10);
SPI_DRV8711_Write(0x02,0x0011);
SPI_DRV8711_Write(0x03,0x0000);
SPI_DRV8711_Write(0x04,0x010A);
SPI_DRV8711_Write(0x05,0x0610);
SPI_DRV8711_Write(0x06,0x00A1);
SPI_DRV8711_Write(0x07,0x0000);

Could you help check this case? Thanks.

Best Regards,

Cherry

over 1 year ago

0 Pablo Armet over 1 year ago

TI__Mastermind 37683 points

Hi Cherry,

Can you provide more clarification. The questions is vague. What does the noise look like? are there transients spikes or high ripples in the current. Knowing this will help me to provide a better answer.

Regards,

Pablo Armet

0 Cherry Zhou over 1 year ago in reply to Pablo Armet

TI__Mastermind 22235 points

Hi Pablo Armet,

Thank you for the support.

Pablo Armet said:
What does the noise look like?

The noise is like the piercing sound.

And the customer do not have the tool to check the waveform so cannot share more details.

Thanks and regards,

Cherry

0 Pablo Armet over 1 year ago in reply to Cherry Zhou

TI__Mastermind 37683 points

Hi Cherry,

So it is not electrical noise but audible noise that is the concern. Is this correct?

Most of the time audible noise is caused by the decay mode. I recommend the customer adjust the decay modes until the audible noise is reduced. More information about decay mode can be found here: https://www.ti.com/lit/an/slva637/slva637.pdf

Regards,

Pablo Armet

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DRV8711: Current noise when the pulse input stops