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DRV8428: FS current and smart tune

Takashi Yamaguchi
Genius 11060 points
Part Number: DRV8428

Hi team,

My customer is considering to use the DRV8428P. Could you pleae help with the questions below?

1). The recommended full scale current is described 1A(max) in the d/s. Is it possible to use it for a current of about 1.2 A?

2). I'm considering using the smart tune function, but are there any disadvantages compared to mixed decay?

Regards,

Yamaguchi

  • 0
    TI__Guru 56650 points

    Yamaguchi-san,

    1. DRV8428P has an integrated current sense. So, we cannot change the output current setting. Please DRV8426P for a higher current application.

    2. I didn't see any smart tune dynamic decay disadvantages compared to 30% mixed decay. If you select smart tune ripple control decay, please verify the output current waveform at the fast speed.

    Regards,

    Wang Li

  • 0 in reply to Wang5577
    TI__Genius 11060 points

    Hi Wang-san,

    Thank you for the answer.

    1. Thank you for the proposal. I will propose the DRV8426P to the customer.

    2. Do you have any material or waveform about the comment of "If you select smart tune ripple control decay, please verify the output current waveform at the fast speed."? 　Does the output current waveform become unstable at high speed?

    Regards,

    Yamaguchi

  • +1 in reply to Takashi Yamaguchi
    TI__Guru 56650 points

    Yamaguchi-san,

    Smart tune ripple decay runs on the slow decay in most of time. So, it is hard to bring the current down.

    Please check the application notes :https://www.ti.com/lit/an/slva637/slva637.pdf, the "Current Distortion Pattern 4" section.

    Regards,

    Wang Li