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DRV8711: Vibration is higher than expected

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Part Number: DRV8711

Hi team,

Here's an issue from the customer may need your help:

With the same configuration, less vibration is present on the test board of the DRV8711EVM. The MOS tube is AO4826, sense resistor 0.05 Ω.

Is the amount of vibration related to the thickness of the lines on the PCB? The lines for B2LS and BISENP are a little thin.

Configuration is as follows:

SPI_DRV8711_Write(0x00,0x0E21);//E25 break 32 trim, highest bit is to change the dead time 
SPI_DRV8711_Write(0x01,0x01AB);//0x170
SPI_DRV8711_Write(0x02,0x0000);//The lower 8 bits are to change the TOFF time 
SPI_DRV8711_Write(0x03,0x0000);//The lower 8 bits are to change the TBLANK time 
SPI_DRV8711_Write(0x04,0x0304);//The lower 8 bits set the TDECAY time 
SPI_DRV8711_Write(0x05,0x0F32);
SPI_DRV8711_Write(0x06,0x00A0);//
SPI_DRV8711_Write(0x07,0x0000);

Could you help check this case? Thanks.

Best Regards,

Cherry


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