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LM5155: some equation confusion in AN: How to design an Isolated Flyback using LM5155

Ruixin Feng
Intellectual 2215 points
Part Number: LM5155

Hi team, 

In AN: How to design an Isolated Flyback using LM5155 https://www.ti.com/lit/an/snva866/snva866.pdf?ts=1656662891761&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FLM5155%253FkeyMatch%253DLM5155%2526tisearch%253Dsearch-everything%2526usecase%253DGPN

In 3.3.2, the result of Equation 15 is not equal to its equation result.

In 3.6, the result of Equation 21 is not equal to its equation result.

Could you pls help to check it? Or anything misunderstanding?

Thanks 

Rayna

  • 0
    TI__Genius 11215 points

    Hello, 

    Thanks for reaching out. There is a typo in equation 21 (and 29) as there is a D term missing at the denominator of the fraction ( in fact 3.1kHz /0.357 = ~8.68kHz), we are currently double checking eq. 15 too. 

    Kind regards,
    EM 

  • 0
    TI__Intellectual 2215 points

    Hi EM,

    Thanks for reply!

    If you correct it, pls share me a new version of this AN, customer want to refer to it.

    Rayna