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Original question:

PMP21683: Design parameters of transformer in power reference design of TI

PMP21683: p/n of the Core and bobbin for that 250uH LLC Transformer ( T100)

Norman Yang
Prodigy 190 points
Part Number: PMP21683

Hi ,

do you know the p/n of the Core ( EFDxx or EExx or ERxxx....)  and bobbin ( 20 pins with pin pitch and space )  for that 250uH LLC Transformer ( T100) ,

since I had a PCB built by this reference design gerber , assembly need to fit the pin spacing and pitch of that transformer ; thanks!

  • 0
    TI__Intellectual 2770 points

    RLTI-1303_Rev1.pdfHello Norman,

    attached the datasheet for your convenience,

    best regards, Bernd

  • 0 in reply to Bernd Geck
    Prodigy 190 points

    Hi Bernd,

    Thank you for the data !  since it is a customized specification , therefor the P/N of core will usually not been shown,

    from the core size, it  seems not  in TDK's ( or EPCOS' ) catalog . 

    Regards,

    Norman

  • 0 in reply to Norman Yang
    TI__Intellectual 2770 points

    Hello Norman,

    of course, normally no magnetics vendor tells you sth. about the used core material;
    the data sheet just shows me it's an e-core and I'm able to read the size.
    But, of course, vendor doesn't show it's BH-curves...

    If you want to handcraft your own transformer look for
    - core material with lowest losses at desired switching frequency range
      LLC, expect overload 80kHz, nominal 100kHz, no load up to 200kHz, i.e. N27, N87, N97 will work;
      N97 offers lowest core losses 300kW/m^3 at 100kHz/200mTmax)
    - core weight/volume must be able to transfer 500W+ power, depending on ambient temp, max temp rise
      and Fcu using N97 500W+ could be handled by RM12 (safe), ETD29/16/10 (squeezed), ETD34/17/11 (very safe).

    If you never winded xfmrs by yourself I would strongly recommend to use a magnetics vendor.

    Best regards, Bernd

  • 0 in reply to Bernd Geck
    Prodigy 190 points

    Hello Bernd,

    I  found your valuable advice just now , this is very helpful.

    Thanks your core material and power handling capability guide .

    There are many magnetic assembly vendors in Taiwan , and most cases 

    are build to customized design spec. ( include core type and material assigned )

    issued by customer ( me ).

    Best regards,

    Norman