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TPS7A19: About Wout data for TPS7A19

Ozawa
Intellectual 850 points
Part Number: TPS7A19
Other Parts Discussed in Thread: LM2940C, LM2940-N

I have a question.

My customer are considering TPS7A19.

Please teach me this question.

◆Question

Customer is looking for "temperature versus loss" data.

I want data of "Temperature vs. Loss" as shown in Figures 23 to 25 on page 12 of the LM2940 data sheet.

LM2940-N/LM2940C データシート:  1-A Low Dropout Regulator (Rev. J) (snvs769j.pdf)
http://www.ti.com/litv/pdf/snvs769j

Do you have similar data?

  • 0
    TI__Guru 55940 points
    Hi Ozawa,

    These curves you reference are derived from the information provided in the Thermal Information table of the datasheet and the equations given in the Power Dissipation and Thermal Considerations section of the datasheet.

    ThetaJA for TPS7A19 is 48 C/W and the operating maximum for Tj is 125C.

    Pd = Iout x (Vin - Vout)

    Tj(max) = Ta + ThetaJA x Pd(max)

    Plugging in the information specifically for TPS7A19 we get:

    125 = Ta + 48 x Pd(max)

    Solving for Pd(max) we get the equation we get:

    Pd(max) = (125 - Ta) / 48

    Very Respectfully,
    Ryan
  • 0
    TI__Mastermind 22610 points

    Ryans reply, in graph format ...