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DRV8262EVM: Setting VREF1 and VREF2 to 0 drives full scale current to motor

Visaacan Rathiraj
Prodigy 80 points
Part Number: DRV8262EVM
Other Parts Discussed in Thread: DRV8842

Tool/software:

Hi,

Currently evaluating the DRV8262EVM for a stepper motor application in PWM mode, in our application we adjust VREF dynamically depending on the load.
What I have noticed is whenever VREF goes to 0V or is set to 0V the driver uses the full scale current on the motor (5A IFS) I am wondering if this is correct or if I am doing something wrong
If i set the value slightly above 0V it works fine

I currently have the EVM connected to our own microcontroller, that was currently communicating with 2 DRV8842 motor drivers for the exact same application and worked great

Regards,
Visaacan

  • 0
    TI__Genius 9070 points

    Hi,

    Thanks for the request..

    The device expert will look into the question and get back to you.

    Thanks,

    Ibinu

  • 0 in reply to Ibinu Alaudeen Nadeera
    TI__Mastermind 32405 points

    Hi Visaacan,

    Visaacan Rathiraj said:
    Currently evaluating the DRV8262EVM for a stepper motor application in PWM mode, in our application we adjust VREF dynamically depending on the load.
    What I have noticed is whenever VREF goes to 0V or is set to 0V the driver uses the full scale current on the motor (5A IFS) I am wondering if this is correct or if I am doing something wrong
    If i set the value slightly above 0V it works fine

    The recommended minimum VREF operating voltage is 50 mV. With VREF = 0 V the device behavior can be abnormal. You could try Mixed or Smart Tune decay to see if behaves differently. Regardless we recommend min VREF = 50 mV. Thank you.

    Regards, Murugavel