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DRV8311: PWM Generation Mode

Annie Liu
Genius 10295 points

Part Number: DRV8311

Hi Team,

Customer has the following two questions and needs your help.

He used DRV8311P, when using PWM generation mode:

Q1: The PWM cycle, duty cycle, dead time and other related parameters are configured through the tSPI interface, and square waves can be output on the three pins OUTA, B and C. If he wants to drive a brushless motor, does he still need to configure the PWM_STATE register to control the action of the mos tube?

Q2: If it can also output waveforms using PWM generation mode, then how to control the brushless motor to rotate in open loop? What are the specific steps?

Regards,

Annie

  • 0
    TI__Genius 12231 points

    Hi Annie, 

    Thank you for your question.

    Annie Liu said:
    Q1: The PWM cycle, duty cycle, dead time and other related parameters are configured through the tSPI interface, and square waves can be output on the three pins OUTA, B and C. If he wants to drive a brushless motor, does he still need to configure the PWM_STATE register to control the action of the mos tube?

    Yes, the PWM_State register (imaged below) tells the device which specific phase/MOSFET PWM to generate, and thus requires a commutation method based on the motor hall-state for sensored trapezoidal. 

    Annie Liu said:
    Q2: If it can also output waveforms using PWM generation mode, then how to control the brushless motor to rotate in open loop? What are the specific steps?

    Please allow me some time to look into any available resources on this matter. Would this open-loop commutation be FOC?

    Best Regards,

    -Joshua