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DRV8353R: Motor drivers forum

Ray Vincent Aranzaso
Mastermind 18180 points
Part Number: DRV8353R

Hi,

Good Day.

What's the difference between 6x and 1x PWM mode if the customer likes to just use trapezoidal commutation in his application?

What are the cons of using 1x PWM over 6x PWM? In his application, he just wants to spin some motors at constant RPM mode accurately.

Also if he uses 1x PWM mode, is it closed-loop or open-loop control?

Please advise. Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Genius 13550 points

    Hi Ray,

    Thank you for posting to the Motor Drivers forum!

    I did not get a chance to look at this today, but I will come back with a response shortly.

    Best,

    ~Alicia

  • 0 in reply to Alicia Rosenberger
    TI__Mastermind 18180 points

    Hi Alicia,

    Good Day. I would like to follow up on the customer's query. Thank you very much.

    Best Regards,

    Ray Vincent

  • 0 in reply to Ray Vincent Aranzaso
    TI__Genius 13550 points

    Hi Ray,

    The difference between the 1x and 6x PWM mode is that 1x PWM mode is setup to execute sensored trapezoidal control which would make it a closed-loop control as it uses sensors to provide feedback to regulate the inputs. The table below lists the different outputs you can expect based on the Hall sensor inputs that would need to be given for the 1x PWM mode:

    With 6x PWM mode, you would reference the following truth table to program the commutation control method that is desired.

    6x PWM mode allows for more control, though it requires the commutation control method to be programmed manually by the user whereas the 1x PWM mode is already setup for trapezoidal control.

    Best,

    ~Alicia