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DRV8320: About Thermal Shutdown & Thermal Warning

Y.Ottey
Mastermind 6145 points
Part Number: DRV8320

Dear all,

I would like to ask questions about Thermal Shutdown and Thermal Warning of DRV8320.

1. When Thermal Shutdown occurs, the following figure states that the Gate Driver will be HiZ. Is this a recognition that the Gate Driver is disabled and stops?
2. In the state of Thermal Warning, the following figure assumes that only nFault is output.
Also, the function of Thermal Warning comes with DRV8320, right?


3. I believe that in order to generate thermal shutdown, it is necessary to monitor the temperature inside the IC. Is the temperature inside the IC monitored with a thermistor inside the IC? Also, if you monitor the temperature inside the IC by another method, please let me know.

Best  Regards,

Y.Ottey

  • 0
    TI__Guru 65240 points

    Ottey,

    1. Yes you are correct.
    2. Yes you are correct.
    3. A basic concept of how it works is that we use a known and calibrated diode with a known tempco. As the temperature of the die changes we can sense this inside the die because the Vf of the diode will change.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Mastermind 6145 points

    Hi Adam

    Thank you for your reply.

    You have questions about the answers below.

    "3.A basic concept of how it works is that we use a known and calibrated diode with a known tempco. As the temperature of the die changes we can sense this inside the die because the Vf of the diode will change."

    Is the recognition that this diode is inside the DRV8320 correct?
    Where is this diode inside the DRV8320?

    Also, if you know, I would be glad if you could tell me the deviation of the temperature detected at that time (or the deviation of Vf).

    Regards,

    Y.Ottey

  • 0 in reply to Y.Ottey
    TI__Guru 65240 points

    Ottey,

    Sorry for the delay here.

    Yes this diode is internal to the DRV, unfortunately I cannot comment on it's location exactly.

    We do not measure the temperature variation.

    Regards,

    -Adam