• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 733 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DRV8320: Gate Fault Protection for Hardware Interfaced DRV8320

Sudheer Sai4
Prodigy 150 points
Part Number: DRV8320
Other Parts Discussed in Thread: DRV832X

Hi,

I would like to for the Hardware interface devices of DRV8320, if the Gate Drive Fault Protection is enabled or not?

Is there any way we can disable that if it is enabled by default?

If Gate Drive Fault enabled by default, is there any way that the DRV8320 retry after retry period the gate driving procedure as a recovery action?

Thanks

Sudheer

  • 0
    TI__Genius 14487 points
    Sudheer,

    Yes, the DRV8320H has the gate-drive fault detection on it. All devices in the DRV832x family share the same protection features.

    Section 8.3.6.5 in the datasheet describes how the device reacts to a gate-drive fault. Only the SPI devices can disable this feature (see DRV8320S). The only way you can clear the fault on the hardware version is by toggling the ENABLE pin to reset the device. There is no retry time because this is a latching fault.

    Is there a reason you want to disable this feature on the hardware device?
  • 0 in reply to James Lockridge19
    Prodigy 150 points
    Hi James,

    Thanks for the reply.
    We are planning to use this device in a product where the controller card will be placed at more than 2m long distance for the motor driver board. We are planning to permanently enable this device as we don't have control of this enable signal (We have limitation on the number of wires connecting the controller board and Motor driver board). Because of this reason we can't toggle the Enable pin in case of a gate drive fault.
    So we need to check three options.
    1) Disabling the gate drive fault function
    2) Checking if the device can retry as a recovery action.
    3) Power cycle the device

    From your reply I understood that first two options are not possible. We need to think of third option. Please let me know if there is any other possibility.

    Thanks
    Sudheer
  • 0 in reply to Sudheer Sai4
    TI__Genius 14487 points
    Sudheer,

    Is there a way you can guarantee a gate-drive fault condition never occurs in your system? There are two reasons that I can think a gate-drive fault would occur:

    1) The IDRIVE setting is too low to slew the external MOSFET in the desired time. The solution here is to use a larger IDRIVE setting.

    2) The GHx or GLx pins are shorted to the PGND, SHx, or VM pins. Is there a way to avoid this condition in your system design? I usually think something mechanical might cause this, like a frayed wire touching the gate driver outputs or a stray piece of metal shorting the gate-drive output. While power-cycling the device would clear this fault, it may not clear the condition that causes the fault, so the device would just go into the fault state again.

    If you don't want to power-cycle the device (which would work). You can tie the nFAULT pin to the ENABLE pin to implement a retry recovery action. If you want the device to retry slower, you can put a capacitor to ground to slowly bring the ENABLE pin high again after a fault.