I am trying to do an elementary EMI analysis on my Buck converter circuit by modelling the LISN circuit. I am using LTSpice for this. The buck converter works when I simply simulate this circuit alone:-
Here is the waveforms for this circuit:-
But when I try to add the LISN circuit with this I am getting wrong output voltages and thus wrong everything else. What am I doing wrong? I suspect it is something to do with the net labels but I cannot get it right.
Waveforms for this:-
Is the Vpwm1 correct? I am getting a wrong switching waveform.
EDIT:2 After several comments, I have realized the problem lies with the LISN circuit, but I don't know how to set the inductors and capacitors of this module. As per Bruce Abbott's suggestion I lowered it to 5uH but still not getting the right common mode and differential mode voltages, although the output voltage is correct. This is a buck converter (12 V to 5 V @200 kHz):- Here is the waveforms:- How do I fix the C6 value and the LISN L & C values? [This is just for simulation on LTSpice, the real PCB is being simulated on ANSYS SIwave)