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Original question:

UCC25600EVM: Power management forum

UCC25600EVM: UCC25600EVM

Mar Far
Prodigy 30 points
Part Number: UCC25600EVM

I am trying to understand how LLC converter works, in one of the forums, Eric said: "In resonant LLC the magnetizing inductance is used to determine what the resonant tank frequency is." 
I am trying to analyze what is the role of Lm in the circuit. ( I read in monolithicpower website that says adding Lm is related to tank’s response to heavy load and light load).
But I don't understand how Lm can determine what the resonant tank frequency is?!
Could you please explain in more? 
Thank you! 

  • TI__Guru 50040 points

    Hi Mar,

    There is a short video on ti.com that gives a simple overview of the LLC topology here. For a more detailed understanding, you can refer to this LLC introduction. Page 11 shows how the different ratios of Lr, Lm, and Cr impact performance. 

    I hope this helps to answer your question.