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Maximum power dissipation of TPS563201

Satoshi
Guru 19645 points
Other Parts Discussed in Thread: TPS563201

Please let me know about Power dissipation (= Thermal resistance) of TPS563201 below.

①Datasheet written in Rθja: 92.6℃/W and operating temprange are 125℃_max.

   But, in the condition of 3.3Vout / 3A @eff:86%, Tj will over than Maximum rating.

   Is it correct?

②TPS563201 simulated on webench, Rθja result was 62.9℃/W.

   What's the difference?

Best regards,

Satoshi

  • 0
    TI__Guru**** 191445 points
    the datasheet thermal parameters are modeled results based on JEDEC standard coupon. They are basically used for comparison purposes as you can compare different ICs under the same conditions. Actual pwer PCB will typically have lower thermal resistance. It appears that webench is using thermal parameter based on webtherm simulation and real PCB with two layers of 2 oz. copper and lots of power dissipating GND area.
  • 0 in reply to JohnTucker
    Guru 19645 points
    John Tucker-san

    Thank you for reply.
    Please let me check about one point below,

    I thought that datasheet spec (Figure 12:efficiency) is based on JEDEC condition.
    (The same condition as thermal parameter)
    Is is difference?

    Best regards,
    Satoshi
  • 0 in reply to Satoshi
    TI__Guru**** 191445 points
    Although I did not personally take the data for that graph, certainly it was done on an EVM prototype or system evaluation PCB. So far as I know, we have never done any type of testing or measurements using a JEDEC standard coupon. The thermal parameters in the datasheet are derived from simulation, not actual measurements unless specifically stated as such.
  • 0 in reply to JohnTucker
    TI__Intellectual 2590 points
    Thermal parameters are based on JEDEC standard, all the efficiecny and waveforms in data sheet are tested based on our EVM board.
    The webench slimulation result is also based on our EVM.
    thanks!