• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 151 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TMP61-Q1: Failure mode of this device

Kazuki Kuramochi
Expert 8350 points
Part Number: TMP61-Q1

Hello Expert,

My customer consider to replace NTC to this device because this has good linearity on high temp range.
However, we have one concern for this device regarding failure mode.

They are using NTC (and plant to use this) for controlling audio amp's gain based on temperature.
In this application, they are reduce gain when temperature goes high.
However, they worry short mode failure with this device.
This is because, amp's gain become maximum in high temp condition if this device become short.

Then, would you tell me expected failure mode of this device?
In other words, is there short mode failure with this device?

I'm looking forward to hearing back from you.


Best regards,
Kazuki Kuramochi

  • +1
    TI__Expert 8840 points

    Kazuki,

      The TMP6 family of parts only has one failure mode. That is "open". The parts fail open and never operate close to a rail when provide temperature Vsense feedback. If a short from another part effects the TMP6 it can easily detect both a short or an open, by measuring with the ADC. The voltage will be 1.3V at -40C and 2.3V at 125C. A short would read close to the ground rail, and an open would read close to the VCC rail. In either case the controller would know that there is a problem.

    That is why this part has a FIT rate of 3 for safety critical operations for the Q1 version. The non Q1 parts operate the same operations and failure mode.

    https://www.ti.com/lit/pdf/snia034

  • 0 in reply to Gordon Varney
    TI__Expert 8350 points

    Hello Gordon,

    Thank you for your kindly explanation.
    I understand.

    Best regards,
    Kazuki Kuramochi