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TPS23757: High efficiency topology

na na78
Guru 16770 points
Part Number: TPS23757
Other Parts Discussed in Thread: TPS23752

Hi

According to datasheet, TPS23757 supports High-efficiency topology.

What is High-efficiency topology?

Regarding to TPS 23757 and TPS 23753 A, which one is higher efficiency device?

And where can I judge if it is more efficient?

BestRegards

  • 0
    TI__Expert 5615 points
    Hello na na78 and thank you for your interest in PoE solutions from TI.

    When starting a PoE design, I suggest reviewing our TI Designs at a system level (not starting with an IC search and focus). The best way to do this is to go www.ti.com/.../refdesignsearchresults.tsp and then enter the text string "Class x PoE" into the search box on the left (where 'x' = the power level you are designing for...1-8). For example, if you enter "Class 3 PoE," you will get 39 matching results.

    From there, you can scan the designs for the best fit to start your design with...by searching the "Key Features" list.

    For example, www.ti.com/.../PMP30290 design offers 91% @ 48Vin (PoE input), full load, for Class 4 designs. The TI PoE PD device utilized on this design example is TPS23752.

    Let us know if needing more help locating a design that works for you. In order to speed up that assistance, we would need to know the following at a mimimum:

    Class Level
    Efficiency Desired
    Voltage/Current bus specifics (if known)

    Good luck moving forward!
  • 0 in reply to Thomas Lewis
    Guru 16770 points
    Hi Thomas

    Thank you for your reply.

    It is helpful information for me.
    I will refer reference search.

    >What is High-efficiency topology?
    So I understood that "High-efficiency topology" itself is not inportant, it's just expression of word, right?

    BestRegards
  • 0 in reply to na na78
    TI__Expert 5615 points
    na na 78,

    Generically speaking, the buck and flyback power topologies are thought of as the "low cost" approach options...whereas the Forward and Active Clamp Forward topologies are thought of as the "high efficiency" approach options. However, these words ("low" or "high") are just adjectives. In some applications, 88% efficiency is better than the required specification (and could be called high efficiency). In others, 88% efficiency is lower than the required goal of 90% and is therefore "low."

    This is why I prefer to speak in absolutes. Once we (TI) better understand your product specifications (x% efficiency goal, $Y total cost), we are better able to point you to a reference design that would work as a starting point for you.

    Good luck with your design!
  • 0 in reply to Thomas Lewis
    Guru 16770 points
    Hi Thomas

    Thank you for your reply.

    I understood high-efficiency topology.

    I close this thread and I would post the other question on the other thread.

    BestRegards