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DRV8353: motor driver selection

Gemini1000
Intellectual 500 points
Part Number: DRV8353
Other Parts Discussed in Thread: DRV8323, , DRV8300

Hello,

We are searching for a reliable robust BLDC motor driver for our motor control board design. I had a very bad experience with DRV8323 where they kept getting damaged randomly for some unknown reason. That being said we have the following questions :

1- What BLDC driver do you offer from the 100V gate drivers ? Could be SPI or hardware 

2- Do you suggest using a single ground for the entire board ? Or do you suggesting isolating digital ground from power ground? Some TI FAE mentioned to use before that dirty ground ( power ground) must be used for the gate driver or it will result in gate driver damage. 

Appreciate your URGENT response. 

Thanks

  • 0
    TI__Mastermind 18900 points

    Hello Gemini1000,

    I see a mix between the title and the body of the thread so I hope that you used the DRV8353 instead of the DRV8323. But I do have a question, is the 100V nominal motor voltage?

    1). What BLDC driver do you offer from the 100V gate drivers ? Could be SPI or hardware 

    DRV8353:

    If so, I will say that the DRV835x can work here and it would be the first part I recommend to you. The immediate concern I would have is for protection and preventative measures to ensure nothing goes above that 102V abs. max as 2V of ringing is very easy to produce in gate drive architectures because of the parasitics. Most users sit in the 48V-75V range and use the natural margin of the abs. max to hopefully not blow up the part.

    As such, experience says if you didn't consult this IDRIVE post to adjust (in most cases, lower) the gate current for the FETs (https://e2e.ti.com/support/motor-drivers/f/38/t/796378) or taken a look at the motor drive layout app note we've created (https://www.ti.com/lit/an/slva959a/slva959a.pdf ) then I'm not surprised that the parasitic played their role in blowing up the part. I don't mean to say that it isn't robust, as the specifications were validated and qualified during device development, but I am saying I see these as the solutions to 90% of the "DRV835x blew up" posts here on the forum.

    I'm happy to help you debug anything on the DRV835x, as I don't have a lot insight into the damage (VGLS blowing up by chance?), but I understand if you feel that the margin is a bit too close, or if you've had you're time with the DRV835x, then I understand.

    DRV8300:

    We've recently dipped our toes into providing more parts with higher >100V abs. max and we're going through the process right now with the DRV8300. You'll find the device to be a lot, more simple compared to the DRV835x. Take a look and see if its something you might be interested.

    Otherwise, those really are the only two parts we have right now that target the 100V motor voltage range. We have plans to continue to expand in this area.

    2). Do you suggest using a single ground for the entire board ? Or do you suggesting isolating digital ground from power ground?

    Single ground for the board is recommended, I would think of it like the star connection mentioned in the layout app note I linked.

    For some key tips: connecting the GND pin to the power pad is very important and so is the via stitching around the device and on the pad. For the power MOSFET stage specifically, I would focus on the area where current is expected to flow and if there's sufficient vias, wide traces, uninterrupted ground planes, and thick copper to facilitate that. Feel free to take a look at the EVM design files for reference.

    Best,

    -Cole