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DRV8353RH-EVM: Optimal power supply solution for mass production

Part Number: DRV8353RH-EVM
Other Parts Discussed in Thread: DRV8353

Hello, the customer support team directed you.

We are considering mass production of 20,000 units. We need a max 100V power supply solution for the drv5383r and the connected mosfets. Considering the peak moments of the mosfets around, a power supply of max 100V and> 15 A is required. In this case, I think smsp would be both very large (min 1500W) and costly. What solution would you usually recommend for feeding such products?

Buck converters or smps? But in my opinion, smps doesn't have much meaning if it won't be isolated. Does Texas have a solution as a buck converter?

Thank you.

  • Sevda,

    Thanks for posting on the MD forum!

    Please note that the 100V rating of the DRV8353 must include any overvoltage due to motor braking or motor back-EMF generated so we actually recommend ~50V max motor voltage so that the system has appropriate headroom for this.

    I don't cover power supplies so I would need to transfer your post to the buck group or similar, is that okay?

    Regards,

    -Adam

  • I have not seen it in your evaluation board user manual, but there is a warning in databriefs for other brands;
    "" IMPORTANT!
    To protect the bulk capacitor C1, we strongly recommended using an external brake chopper after C1 (to discharge the high brake current back from the induction motor). ""

    Does this also apply to you?

    What can you suggest?

    I have 3 questions;

    a) Is this a situation that needs to be taken according to watt or ampere?

    b) Is it dependent on driving methodology (FOC, six step etc.)

    c) Most importantly, is this a necessary condition for induction motors? So, does it include BLDCs?

    Thank you.

  • Sezen,

    You would need to protect the bulk capacitors and any devices on the power supply that drives the H-bridges. Any case where the motor is decelerating or braking can cause the back-EMF of the motor to spike and this could feed back into the power supply and raise it's voltage. We are mostly concerned with raising the voltage of the supply and damaging it or the components attached to it.

    Using FOC or some other smart algorithm to slow the motor instead of a sudden brake would help reduce this power supply voltage overshoot.

    Any motor can have this issue since naturally all motors generate back-EMF when spinning.

    Regards,

    -Adam