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PMP41042: CLLLC integrated transformer

Michal Pridala
Prodigy 20 points
Part Number: PMP41042
Other Parts Discussed in Thread: TIDA-010933, PMP21999, PMP22650

Tool/software:

Hi. In our previous version of CLLLC we have transformer with external primary and secondary inductor. In next design we want to save some space on the board and power loses in external primary and seconday resonant inductors. So we want to use tranformer with integrated primary and secondary resonant inductors. In your reference design TIDA-010933 and PMP41042 is this transformer used. Please could you tell us what are your experiences with this tranformer in terms of Electromagnetics interference and power losses? Do you think that this our decision with integrated tranformer is correct?

  • 0
    TI__Expert 4070 points

    Integrate the resonant inductors into the transformer could save space, but not necessary losses. Once you integrate the resonant inductor into the transformer, the coupling factor between primary and secondary will go down and have larger MMF variation, which generally implies higher power loss.

    But we do see customers embrace both options and we made reference designs for both options.

    For example, PMP21999 uses external resonant inductors and PMP22650 uses integrated resonant inductors.

    Both designs have good performance.

    Regards,

    Sheng-Yang Yu