• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 324 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.

TPS54201: Failure mode with large current flow

Ryotaro Fukui
Intellectual 2345 points
Part Number: TPS54201

Hello team,

My customer has a question about the failure mode of the LED driver TPS54201.

Is it possible to consider a failure mode in which the load (LED) continues to flow at the designed upper limit current value when this component fails?

Since the customer uses a high-power LED, it will generate heat if it continues to flow at the maximum current, so they want to confirm it in terms of product safety.

Best Regards,
Ryotaro Fukui

  • 0
    TI__Mastermind 22745 points

    Hi Ryotaro,

        For the situation that youddscribed that device wroks under current limit, since there is the current limit protection so don't woory about the it will demage the device. But the main concern comes from that thermal shutdown since it always works under high power condition. 

    And for TPS54201, it is designed with the hiccup mode which means that it will enter into auto-retry mode when it trigger fault.

    BR

    Sean

  • 0 in reply to Sean Zhou
    TI__Intellectual 2345 points

    Hello Sean,

    Thank you for the quick reply.

    I've got an additional questions about the answer you gave me. It would be helpful if you could answer these too.

    • It seems that the behavior will be the same when an external abnormality such as a load appears, but does it mean that even if the TPS54201 itself breaks down, it will behave in the same way?

    Best Regards,
    Ryotaro Fukui

  • 0 in reply to Ryotaro Fukui
    TI__Mastermind 22745 points

    Hi Ryotaro,

         No, it will have different behavior when some fault case, such as the LED open/short, Rsense open/short and please refer to our datasheet application section.

    BR

    Sean

  • 0 in reply to Sean Zhou
    TI__Intellectual 2345 points

    Hi Sean,

    I'm sorry I might caused a misunderstanding. The customer's question is not about the peripheral circuit failure, but about "when the TPS54201 itself fails".

    "Is there a failure mode or past failure case in which the load (LED) continues to flow at the designed upper limit current value when TPS54201 fails?"

    Should I ask another team a question like this? If I am asking to a wrong team, it would be helpful if you could give me the correct contact information.

    Best Regards,

    Ryotaro Fukui

  • 0 in reply to Ryotaro Fukui
    TI__Mastermind 22745 points

    Hi Ryotaro,

         I'm the right person to answer your question about the TPS54201, there is no failure mode for TPS54201 to work under current limit when it fails.

    BR

    Sean