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DRV8312 getting hot

Robert Steinbauer
Prodigy 185 points
Other Parts Discussed in Thread: DRV8312, DRV8301

Dear All.

We want to use the DRV8312 in our devices with BLDC motors(48V motor supply).

But if we control it using sine commutation, the DRV gets really hot with even low speeds of about 8rotations per second.

I have attached the schematic, the layout of all layers and some screenshots made with my oscilloscope.

Can anybody tell me if there is a mistake in the schematic or layout, or does anybody have the same problems.

Best regards, Robert

5706.TQXAA0c1_Official.zip

  • 0
    TI__Guru 55615 points

    Robert,

    What is your phase current?  The device will under the best layout and circumstances only be able to deliver 3.5A continuous.  Even under that case, the device will be too hot to touch.

    If you need a cooler running option, I would consider a pre-driver like DRV8301/2.

     

  • 0 in reply to Ryan Kehr
    Prodigy 185 points

    Ryan,

    many thanks for your reply. The tip with the phase current was the right one. I have measured a phase current of starting at 1A. If I go up with speed current increases up to 3.2A and then going back to something below 2.5A concerning to the back EMF of the motor.

    The driver gets a maximum temperature of about 90degree Celsius.

    So I have to look if I can use the driver or just use a pre-driver with discrete MOSFETs instead.

    Best regards,

    Robert