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DRV8718-Q1: output frequency spread spectrum

Chuqiang Wen
Expert 5865 points
Part Number: DRV8718-Q1

Hi Expert,

My customer meet the RE failure during EMI test. Their fsw to control the motor is about 20KHZ. They also have other devices which generate the 20KHZ control signa to motor drive. In order to improve the RE performance, they would like to check if DRV8718's output fsw can support 18KHZ~22KHZ spread spectrum. If yes, I think the spread spectrum need to be generated by PWM input side, correct? 

Thanks!

Ethan

  • 0
    TI__Guru 55615 points

    Ethan,

    Please check the datasheet.  Spread spectrum is integrated into the driver on the digital oscillator (freq. given in DS) and charge pump (freq. given in DS).  

    For radiated, it is best to slow down edges using lower drive current for gates of FETs.

    Regards,

    Ryan