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LM5045: traditional hard switching full bridge VS phase shift full bridge in 54V input

Red Yen
Expert 4320 points
Part Number: LM5045
Other Parts Discussed in Thread: UCC28950, , LM5046

Hi Support team 

may i have your help to compare w/  traditional hard switching full bridge VS phase shift full bridge in 54V input & 1KW application 

which one have better efficiency and why?

  • 0
    TI__Mastermind 34465 points

    Hi Red,

    The phase shift full bridge offers a zero voltage switching topology and this is results in lower switching losses if the input voltage is high.

    For example the UCC28950 is normally used on the 400V output of a pfc stage for this reason.

    A 54V full bridge will probably not have a high switching loss.

    At 1kW and 54V the conduction losses are going to be more significant than any switching losses.

    I am adding a document showing the efficiency of the LM5045 (full bridge) and the LM5046 PSFB and you can see there is very little efficiency changes between these two parts with a 36V to 72V input range.

    2425.Doc2.docx

    Regards

    John