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WEBENCH® Tools/LM5155: Interface forum

BADAL KUMAR6
Prodigy 130 points
Part Number: LM5155


Tool/software: WEBENCH® Design Tools

hello,

bode plot analysis of lm5155 i am not able to get gain margin because the plot which webench plotted  in which phase plot is not crossing through zero degree line.

so my question is how can i calculate phase margin for that kind of plot?.

i am sending you snap of webench plot.

  • 0
    TI__Guru* 78675 points
    Hi Badal,

    This may need our webench group to extend the simulation range of the frequency. However, you can easily tell the phase and gain margins from the above plot: The phase is almost reaches 0 degree and the gain margin should be around 28dB. You can use cursor to read the phase margin. From the above plot, it is at about 75deg.

    Thanks,
    Youhao Xi, BCS Applications Engineering