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TPS53355: Questions of TPS53355

Jimmy Lai
Expert 6845 points
Part Number: TPS53355
Other Parts Discussed in Thread: TPS548D22

Dear Team,

Looking forward to your answer of my questions. 

And we have run some simulation on TI’s WEBENCH and found some of them not able to reach 90% efficiency. Since it is evaluating for a fanless system so the efficiency is quite important relatively.

Would you please suggest us the suitable parts for our DC/DC solution with the requirements listed below?

  1. Efficiency >90% at least.
  2. Vout tolerance must < 1%.
  3. Cost is sensitive, the cheaper the better.
  4. 12VIN
  5. Vout/Iout: 0.88V/ 16A

Many Thanks,

Jimmy

  • +1
    TI__Guru 56985 points

     

    To get to >90% efficiency at 12V to 0.88V @ 16A, I would recommend looking at the newer 35-40A applications, which will have higher efficiency at 16A than the 20-25A designs.

    WeBench is showing 90.6% efficiency 12V to 0.88V switching at 425kHz.  The WeBench defaults to 650kHz, so you need to select the "configuration options" and select switching frequency 425kHz on the left side and scroll down to "redesign" 

    To improve output voltage accuracy, select the 0.85V reference voltage.

    TPS548D22_12V0to0V88_16A_425kHz.pdf

    If they have a 5V bias available in their system, they could power VDD and BP from an external 5V, and may be able to reach 90% efficiency at 650kHz to reduce the size.

  • 0 in reply to Peter James Miller
    TI__Expert 6845 points

    Hi Peter, 

    Thanks for your great support.

    This one could be an option and we have used the same part on previous project for this customer. Is this part recommended for new design? How about its L/T?

    But as I recalled, this part is more expensive than TPS53355. Am I right?

    Many Thanks,

    Jimmy

  • 0 in reply to Jimmy Lai
    TI__Guru 56985 points

     

    The TPS548D22 is active.

    For relative pricing, you can compare the 1ku price for both the TPS548D22 and the TPS53355 on their respective product folders, but are subject to change, as are lead times.

    The TPS548D22 will generally allow for a smaller and higher efficiency solution than the TPS53355, which is an older device than the TPS548D22.