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LM5155: Phase margin

Kuramochi Tadahiko
Guru 28715 points
Part Number: LM5155

Hi,

I'm using the QuickStart Calculator.

Is the phase margin about 22° or 202° when the bode plot is the following?

Best Regards,

Kuramochi

  • 0
    TI__Mastermind 21720 points

    Hi Kuramochi,

    Thanks for reaching out with your question and for considering the LM%155 in your design.

    The plot is showing the phase margin relative to 0 deg. In the screenshot above the phase margin is only 22 deg. I suggest increase the value of CCOMP. This is lower the frequency of the compensation zero (fz_ea) and increase the phase margin.

    Please let me know if you have any questions.

    Thanks,

    Garrett