Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

  • State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 64 subscribers
  • Views 178 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.

TPS5410-EP: Thermal Calculations

Ioannis Stamoulis
Prodigy 10 points
Part Number: TPS5410-EP
Other Parts Discussed in Thread: TPS5410-Q1, TPS5410

Hello,

I was going through the thermal calculations and I noticed that the Quiescent Current Loss formula doesn't seem right. I believe it needs the quiescent current added (typ: 3mA). Even so, there is a significant difference between the total calculated current and the one named Pic on WEBENCH (with TPS5410 or TPS5410-Q1, as the EP version is not supported). Could you please check the formula and let me know of the correct one? Thank you very much.

  • 0
    TI__Mastermind 34790 points

    Hello Ioannis,

    I believe those equation's do need some further refinining, but may be good approximates.

    I would recommend you refer the to the TPS5410 webench design to obtain IC power loss, as , it is correlated against bench data.

  • 0 in reply to Marshall_Beck
    Prodigy 10 points

    Hi Marshall,

    Thank you very much for your quick reply. Unfortunately, this is not quite the answer I was looking for. The equation is incomplete, not unrefined.

    I would check my calculations against webench results, so I can ensure correctness and present both as evidence. Without the correct equation, I cannot present a design for review based solely on the tool's results as they cannot be validated, at least by us. I hope you understand.

    Thank you for your time.

  • 0 in reply to Ioannis Stamoulis
    TI__Mastermind 34790 points

    Hello Ioannis,

    I understand.

    If you have any concerns with webench I would advise correlating against EVM or the efficiency calculations contained in the datasheet.

    To compute the IC power loss alone, you can factor out the conduction and core loss of the inductor (MSS1260-683) utilized for the measurements.

    Conduction loss: LDCR*IOUT^2

    Core loss: www.coilcraft.com/.../