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DRV8306: PWM speed issue

Cherry Zhou
Mastermind 22235 points
Part Number: DRV8306

Hi Team,

Could you help share how can the speed of the BLDC be adjusted by the PWM of the DRV8306, by the frequency or duty cycle of the PWM? Also, what is the highest speed supported by the DRV8306? Thanks.

Best Regards,

Cherry

  • 0
    TI__Genius 11355 points

    Hi Cherry,

    Changing the duty cycle of the input PWM will change the speed of the motor.

    The highest supported speed of the DRV8306 is dependent on the motor being used. The DRV8306 can support up to 30kHz hall sensor frequency. To calculate the hall sensor frequency relative to the number of motor pole pairs and RPM, use this equation:

    F = N*RPM/60 (F in Hz, N is pairs of poles, RPM is revs per minute).

    Please note that this DRV is open loop only but you can make it closed loop by using FGOUT and your MCU. The MCU will need to parse FGOUT and control the DRV inputs so that the loop is closed.

    Regards,

    Joshua