• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 238 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.

DRV8412: Output delay after reset

Michael Balourdas
Expert 5455 points
Part Number: DRV8412

Hello,

After a RESET low to high input, how long does it take for the output to start up again?

Thanks,

Michael

  • 0
    TI__Mastermind 19740 points

    Hi Michael,

    After RESET the output will experience the typical propagation delay of 38 ns before the FETs are active. 

    Best,

    David

  • 0 in reply to David Medis
    TI__Expert 5455 points

    Hi David,

    Thanks for the info.

    One follow up question:

    This device is being used as as the output stage of digital amp.

    When a high level music signal is played, this device shuts down because of over current detection.

    The music signal level is changing all the time, so the short term peak current is very brief

     When an event like this happens, we plan to reboot this device immediately and continue playing music because we want to keep the product working as continuously as possible. Is the 1 second wait time before reset required in this situation? What are the risks of not waiting?

    Thanks,

    Michael

  • 0 in reply to Michael Balourdas
    TI__Mastermind 19740 points

    Hi Michael,

    The 1 second wait time is to ensure the driver has enough time to decay the current from the inductive load and any other parasitic inductances in the current path. If this wait period is ignored, it is possible that the device will quickly hit OCP again and again. This will lead to temperature increase and eventually thermal shutdown of the device. 

    Best,

    David