• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 64 subscribers
  • Views 770 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.

UCD9090: UV Fault - Restart Count

Felix Arul Rajesh Francis
Intellectual 480 points
Part Number: UCD9090

We are trying to implement the Fault response conditions.

1. We enabled the Glitch Filter and setting voltage fault max glitch time as 0.8ms

2. For the response, for OV & UV faults alone, with shutdown with Toff delay.

3. For restart, we are planning to restart multiple times (at least 5 times)

We could set the 5times restart for OV fault condition, but for UV fault condition we could set only 1 time. 

Wont it be possible to set more than 1 times for the UV faults? I think datasheet doesn't recommend anything specifically for UV fault restart conditions.

Probably I would have missed out.

Kindly  help us to resolve this.

Regards,

Felix.

  • 0
    TI__Genius 9845 points

    You can set UV fault to restart 5 times. UV fault and OV fault have separate fault response setting. If the rail is not able to come up, you may check if there is any sequence-on dependency not met, such as waiting for another rail to turn on first, or a GPI signal to assert.

    Regards,

    Zhiyuan

  • 0 in reply to Zhiyuan Hu
    Intellectual 480 points

     Hi Zhiyuan,

    Thanks for your reply on the query.

    We are not able to increase the count for the UV fault restart. Kindly refer the attached snap shot.

    But for OV we could increase the count upto 14.

    Regards,

    Felix.

  • 0 in reply to Felix Arul Rajesh Francis
    TI__Genius 13700 points

    An UV fault cannot be detected until the unit has reached regulation, otherwise the rail would never turn on initially.

    This means every UV condition would be a unique event as the rail would have been regulating before it occurs, which is the reason you cannot set the UV restart beyond a single retry.

    To handle the condition where the rail fails to start after a UV condition you will need to use the TON_MAX_FAULT_LIMIT (it is listed as Max Turn On beneath the Turn On Delay setting in the GUI).  This sets the maximum amount of time allowed before the rail is expected to be within regulation, if this is exceeded then a fault is declared and a separate fault response handles this condition (with a different name,Time On Max).  Time On Max can be set to trigger multiple times.