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UCD90120A: how to enable Power Rails shutdown feature on fault detection

Rakesh Muralidharan
Expert 2810 points
Part Number: UCD90120A


Hi,

In Fusion Design GUI , I could see an option to shutdown selected power rails on detecting fault in a given rail...

I checked all the power rails to be turned OFF in fusion Design & programmed it into UCD90120A .

On creating a fault condition (rail Under Voltage) I could not observe other rails shutdown though the rail for which fault condition occurred entered into a shutdown mode. What could be the reason for this.?? How to enable shutdown of other related rails as  well??

Is there any documentation which explains how to enable this feature??

  • 0
    TI__Guru 66380 points

    Hi

    If you want shut off other rails due to a fault on a given rail, the other rails must be set as fault shutdown slaves of the given rail.

    This is under same page where you configure timing, dependencies.

    Hope this helps

    Regards

    Yihe

  • 0 in reply to yihe
    Expert 2810 points

    I have already set fault shut down slaves as mentioned above. But on failure the rail for which the fault occurred turned OFF.

    Once I set the Sequence TimeOut action OFF of all rails  as ""Disable Rail"" all the rails  shut down occurrence of failure. Please let me know the issue.

    What is the importance of this setting??

  • 0 in reply to Rakesh Muralidharan
    TI__Guru 66380 points

    Hi Rakesh

    For the faulted rail, you have two options to shutdown it down: 1. shutdown immediately - no checking sequencing off dependencies. 2 soft off - need make sure the sequencing off dependencies are met before shuting off. you can set the option ini the fault response

    For the rails set as fault shutdown slave, they are always soft-off. so device check their sequencig off dependencies before turn off.

    Based on what you described, some rails' sequencing off dependencies are not met therefore device can not shutdown.

    For example:  rail 1 is the faulted rail, rail 2 and rail 3 are fault shutdownn slave of rail #1. but rail 2 and rail 4 has sequencing off dependencies  on rail#4.

    since #rail 4 is not part of the fault shutdown slave of rail#1, you will have problem to turn off rail 2 and #3, as for rail #1, it is up to which option is used.

    when you set a timer and acition for the sequencing timeout, device will force to turn off the rail when timeout is present.

    hope this helps.

    Yihe