• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 667 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

Power dissipation for TPS9264/41

Ruben Jönsson
Prodigy 220 points
Other Parts Discussed in Thread: TPS92640, TPS92641

Hi,

I am considering using the TPS92640 (or the TPS92641 if I need better PWM performance) for a high power led application.

How can I calculate the total power dissipation in the IC given Vin, Vout, fsw and data for the FETs?

/Ruben

  • 0
    TI__Mastermind 25500 points

    The power dissipation in the IC can be closely approximated by using the following:

    1. Quiescent current dissipation: P(Q) = IQ * Vin

    2. VCC current dissipation: P(VCC) = I(VCC) * Vin

    4. I(VCC) = 2 * Qg(total) * fsw (the factor of 2 assumes the same FET for both high and low side, otherwise calcluate I(VCC) for each and add them)

    3. P(total) = P(Q) + P(VCC)

    Those are the majority losses in the IC, there will be some additional but they will be a small percentage of those above.