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DRV10975: Current limit

Pok Man Leung
Prodigy 60 points
Part Number: DRV10975

I had set the lock detection current threshold to maximum, which is 0x0F to EEPROM 0x28. However, the supply current could not be above 0.2A with 12V DC supply. I applied some load on the motor and it stopped. I read the fault code and only Lock Detection Current Limit is detected.(read 0x01 in register 0x1E). The motor can enter Close Loop.

Also, I am planning to use the IC to control the motor of  a model car(very light in weight, approx. 500g). Doe this IC fit my need? 

  • 0
    TI__Prodigy 575 points
    Pok Man,
    I've assigned this thread to our support expert to help you. Before that person gets back to you, I have a few questions:
    1. What are you trying to accomplish with this motor in your model car? Moving the wheels?
    2. How much current do you need? You mentioned you're using a 12V, 0.2A DC supply; is the current the motor needs less than 0.2A?
  • 0 in reply to Zhao Tang
    Prodigy 60 points

    Dear Zhao

    Sorry for late reply.

    1. Yes, the motor is used to drive the wheel through a mechanical differential

    2. I am not sure about it. The speed without load is enough, however, it stop when load is applied. I wonder it is the protection of the motor driver or not, but the peak current does not exceed 0.3A, and it return lock current limit detection error.

    Pok Man

  • 0 in reply to Pok Man Leung
    TI__Mastermind 18900 points

    Hello Pok Man,

    Apologizes for delay.

    1. I'm surprised to hear that you're using a BLDC motor, especially sensorless, for this application. Usually BDC motors are able to apply torque very quickly where sensorless BLDC usually need a much longer time to spin up to a target speed.
    2. Usually, the presence of a load will increase the current needed to drive at the same speed. Usually, current limit happens for two reasons
      1. The Programmed Phase Resistance and Kt are incorrect. Please refer to this post to measure them correctly
      2. The motor resistance (and probably inductance) is very low and outside of our application range. I've copied the table below for your viewing

    Best,

    -Cole

  • 0 in reply to Cole Macias
    Prodigy 60 points

    Dear Cole,

    Thank you for your reply.

    I later on found that senseless BLDC is not suitable for my case. I am planning to use the one with hall sensor. Thank you for your advice.

    Regards,

    Pok Man