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DRV8353: About Motor Driver's PWM frequency

Naoki.N
Intellectual 515 points
Part Number: DRV8353
Other Parts Discussed in Thread: TMS320F28379D, , DRV8332

I am searching DC brushless motor driver.I plan to control this driver with DSP TMS320F28379D.

According to following E2E,  it was written TMS320F28379D can perform FOC processing period is 460ns.

https://e2e.ti.com/blogs_/b/industrial_strength/archive/2017/06/27/unprecedented-current-loop-performance-from-an-off-the-shelf-mcu?HQS=dis-othe-null-makernews-agg-blog-fje-jp

To perform this period,  I think it will better to choose high PWM frequency motor driver.

For example, gate driver DRV8353's recommended fPWM is MAX 200kHz.

On the other hand, FET included driver DRV8332's recommended Fsw is MAX 500kHz.

I think this frequency is depend on FET's gate resister and gate capacitor.

Please tell me how the fPWM specification of the gate driver is determined.

Is it better to use a driver that includes an FET like the DRV8332 to achieve a high PWM frequency?

  • 0
    TI__Guru 65860 points

    Naoki,

    Thanks for posting on the MD forum!

    You are correct, the FET parameters such as resistance, Cgs, and Cgd are deciding factors in the FETs switching frequency. The thermal handling of the FET is also important to consider.

    For the gate driver, the internal frequency which the device operates, the input deglitch, and output monitor speed will determine the fPWM supported.

    For your board you can select the DRV and the FET separately so that you can support the fPWM required.

    I would suggest ordering some EVMs and trying this with your MCU/motor.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Intellectual 515 points

    Adam,

    Thank you for answering questions.

    When using DRV8353 in 1 × PWM mode, is the frequency of INHA limited to MAX 200kHz as shown in the data sheet?

    In other words, does the switching frequency of the FET also be limited to 200kHz?

    Best regards

    Naoki

  • 0 in reply to Naoki.N
    TI__Guru 65860 points

    Naoki,

    Yes the input is limited to 200kHz as the datasheet mentions.

    The output of the DRV will also be 200kHz but the FET is separate and you should check the datasheet of the FET directly.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Intellectual 515 points

    Adam

    Thank you for answering my question.

    According to the DRV8332's datasheet, PWM switching frequency Fsw is up to 500kHz.

    Therefore does DRV8332 have better PWM frequency specification than DRV8353 ?

    Of course, I understand that whether it can be used at this frequency depends on the motor , and needs to be verified  temperature.

    Best regards

    Nishimura

  • 0 in reply to Naoki.N
    TI__Guru 65860 points

    Nishimura,

    I think both of these frequencies are well above the rated frequencies of most if not all motors that will be used. If you have a specific motor you would like us to check for compatibility, please let us know.

    Regards,

    -Adam