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Original question:

DRV8320: PWM Mode Issues

DRV8320: PWM Mode Issues

navin singh
Prodigy 30 points
Part Number: DRV8320

I am unable to configure my DRV8320S in 1XPWM mode in one count. It takes more than 3000 count to configure it. Also the IC is getting heated up to 60*C. What may be the possible cause. Even after configuring, i am unable to see comutation output on PINS of DRV.

  • 0
    TI__Expert 4435 points

    Hi Navin,

    Can you please clarify whether you see this when using TI 's DRV8320 EVM and the GUI provided with it or this is happening on your own development?

    If you are using the GUI, you need multiple cycles for the motor due to the ramp rate parameter in the GUI.

    For information on all of the GUI parameters, please refer to the user guide

    Also, make sure the output for the halls match the corresponding phase of the motor, this can cause commutation problems. Thank you.

  • 0 in reply to Luis Riveros
    Prodigy 30 points

    Hi,

    Its our own designed Evaluation board. We have not bought it from Texas instrument. And what if we don't connect the External pad to ground. Is there any problem we would be facing if there is no connection between EP and ground. Also why the DRV8320S IC is getting to hot even though there is nothing connected on its output GH and GL Pins(Stand alone). Our design is almost same as the reference design. All pin voltages are as per the requirement.  

  • 0 in reply to Luis Riveros
    Prodigy 30 points
    Hi i dint get any reply from the team. Waiting for your response.
  • 0 in reply to navin singh
    TI__Expert 4435 points
    Hi Navin,
    I apologize for the delayed response. The thermal pad to is not optional and it must be connected to ground, this might be related to the thermal issue you are experiencing.
    What is the voltage level at your mode pin? Could it be possible that you are not on the correct mode?
    Does the device report a fault at any given time? if so, under what conditions?
    Also, our EVM and GUI is a good option to start evaluation. From there, you could observe the differences between the signals provided to the device versus your setup. Thank you.
  • 0 in reply to Luis Riveros
    TI__Expert 4435 points
    Hello Navin,

    Were you able to find your answer on your end? I haven't heard from you so I assume you were able to solve your question. I will close the thread but please start a new one if this is not correct or if you encounter a new problem. Thank you.