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DRV5055: Long term stability of sensitivity

Part Number: DRV5055

Dear Specialists,

My customer is evaluating DRV5055 and has a question.

I would be grateful if you could advise.

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Has the Sensitivity listed on the datasheet changed over time after 2 years of long-term use?

If the sensitivity seems to change, I would like to know the amount of change.

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I appreciate your great help in advance.

Best regards,

Shinichi

  • Hello Shinichi,

    Thanks for considering to use Texas Instruments. The datasheet does post a Sensitivity lifetime drift specification of less than 0.5%.  I believe that corresponds to the drift you might see over 1000 hours at 125C.  To extrapolate what that translates to for your customer's situation, you might consider using the Arrhenius equation and taking the ratio of the customer use rate versus our 125C test rate.  That equation would look like:

    ru/rt = exp(Ea/k(1/Tu-1/Tt))

    ru = customer use temperature rate

    rt = tested temperature rate (125C)

    Ea = Activation energy

    k = boltzmann's constant

    Tu =customer use temperature

    Tt = tested temperature.

    These values might be extracted from our MTBF calculator found here.

    Then to find the use time at the use temperature that yields similar results to the lifetime test time, I would multiple tt*ru/rt where  tt = test time (1000 hours in this case).  Alternatively you could multiply ru/rt * 0.5% to extrapolate what you might expect presuming a linear drift.  

  • Hi Patrick,

    Thank you for your reply.

    I'll share your answer with the customer. 

    When they have an additional question, I consult you again.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi