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TPS82130: Tj for 100,000 hours

mayumi.T
Expert 1015 points
Part Number: TPS82130
Other Parts Discussed in Thread: TPS62360,

Hello,

Our customer have a question.

The data sheet states "Tj module operating temperature range 100,000 hours (1)" .
Why is it 100,000 hours? (Is it a measured data?)

Although it does not seem to be written on IC data sheet which is not SiP,Is it due to inductor limitation?

Please teach if you know.

Thank you.

  • 0
    TI__Guru**** 150950 points
    The TI standard for reliability for all devices is 100k hours. Unless otherwise noted, all devices are designed to operate for this long. For comparison, please see the TPS62360 D/S for an example of a device which does not meet 100k hours lifetime under all conditions.
  • 0 in reply to Chris Glaser
    Expert 1015 points
    Dear Mr.Glaser

    Thank you very much for your response. I understood about 100K hour of the data sheet.

    The client wants to make the TPS82130 the recommended part, and evaluates it.
    We have received additional questions to make the evaluation similar to you.

    Q1:
    About Thermal Information described in Datasheet P4,
    Does Junction-to-Case (top), top mean "Inductor Surface"?
    Q2:
    Datasheet Although it is the derating curve described in P14, 15,
    At which point do you measure Ta?

    Please kindly advise.

    Thank you.
    Mayumi
  • 0 in reply to mayumi.T
    TI__Guru**** 150950 points
    Yes, top case is the inductor top. The inductor and rest of the part are very tightly thermally coupled, so there is a minimal temperature gradient.

    The ambient temperature is the temperature of the still surrounding air.

    This app note discusses thermal performance in more detail: www.ti.com/.../slyt724.pdf
  • 0 in reply to Chris Glaser
    Expert 1015 points
    Dear Mr.Glaser

    Thank you very much for your answer.

    Could you tell me more "ambient temperature is the temperature of the surrounding air?

    In Figures 16 to 18 of the data sheet (SLVSCY 5C) ,
    The measurement conditions are assumed to be Ta = 25 ° C.

    Q: How was it measured?
    　Please tell me the measurement points of the surrounding temperature.
    　How far is it from what surface?

    If you do not mind,please tell me.

    Thank you.
    Mayumi
  • 0 in reply to mayumi.T
    TI__Guru**** 150950 points
    It is simple to think about. It is like in a house, where the thermostat sets the room temperature to 22 C, for example. This is the air temperature referred to.

    For the D/S graphs, these are taken in a thermal chamber, which is the same thing as a house with thermostat but on a smaller scale.

    The ambient environment/air is where all the heat must go to eventually.