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DRV8320: The Feature of DRV8320

Y.Ottey
Mastermind 6145 points
Part Number: DRV8320

Dear all,

I would like to ask following questions about DRV8320

1.VDS detection time (tOCP) is 4μs (in hardware mode)

We plan to use this for brushless DC motors this time, and the SW frequency will be 12.5 μs.
In this case, is it always a short circuit or overcurrent detection?

2.Is there anything other than register setting (OCP_MODE = 11b) to disable VDS?

3.The following internal block diagram shows that the IDRIVE pin has a pull-up resistor and a pull-down resistor. Is an external pull-up or pull-down resistor required at this time?

If necessary, how much resistance can be connected?

4.The following description is on the ENABLE pin pin description page.

In this description, "fault condition" is used. Does this mean that nFault is High and Latch is applied?
Also, is it acceptable to recognize that when High is input to the ENBLE pin, the IC is enabled?

Best Regards,

Y.Ottey

  • 0
    TI__Guru 63350 points

    Ottey,

    Thanks for posting on the MD forum!

    1. Your PWM frequency is 80kHz in that case, correct?
    2. Yes, the VDS pin can be tied to DVDD in the hardware device.
    3. With no external pull up or down the pin will be configured in Hi-Z mode, if that is appropriate for you then no external component is needed. This being said it is highly recommended to provide a footprint for external components here to allow adjustments to the IDRIVE in your end application or debug.
    4. Yes and yes.

    Regards,

    -Adam

  • 0 in reply to Adam Sidelsky
    Mastermind 6145 points

    Hi Adam

    Thank you for your reply.

    "Your PWM frequency is 80kHz in that case, correct?"

    This answer is Yes.

     

    I would like to ask more question.

    This IC does not require a gate resistor. Is there any problem with the operation of DRV8320 when a gate resistor is connected?
    If an external gate resistor is required, is an external resistor required between the IDRIVE pin and DVDD pin?
    (If the Peak current sink is set at a maximum of 2A, it is stated that it can be set by connecting to DVDD as shown below. If you use a gate resistor, please tell me if you need an additional resistor)

    Regards,

    Y.Ottey

  • 0 in reply to Y.Ottey
    TI__Guru 63350 points

    Ottey,

    You can use an external gate resistor if you prefer. You should still select an IDRIVE setting by placing a resistor on the IDRIVE pin either to GND or DVDD depending on the setting you select. Please keep the resistor less than 20-30 ohms as this will ensure that the protection features can still work.

    Some of our customers do set the max IDRIVE current and use a gate resistor. No additional IDRIVE pin resistor is needed if you configure the IDRIVE pin as tied to DVDD and use an appropriate gate resistor. Please make sure to check all gates from Gate to Source when your application is switching and loaded to ensure that there are no oscillations, overshoot, or undershoot due to your gate resistor selection.

    Regards,

    -Adam