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LM5155: Rcomp

Kuramochi Tadahiko
Guru 28715 points
Part Number: LM5155

Hi,

Rcomp is 18.567kΩ on the attached calculator.

★LM5155_Calculator_2448_4A.xlsx

However, it is 19.327kΩ on the equation of the datasheet as below;

Could you tell me the equation of Rcomp on the calculator?

Best Regards,

Kuramochi

  • 0
    TI__Mastermind 21720 points

    Hi Kuramochi,

    Thanks for reaching out with your questions.

    The equation from the application note uses the simplified equations from the transfer function of the plant. This doesn't include the effects of slope compensation. The quick-start calculator uses the plant transfer function that includes slope compensation and will more accurately calculated the RCOMP value. Note including the slope compensation into the plant transfer function makes deriving a simple equation not possible, this is why the equation from the application note is slightly different from the excel calculator. 

    Thanks,

    Garrett