I struggled to compare the EMI filter needed for 24V to 5V non-isolated BUCK DC/DC (running 300KHz to 500KHz) to ensure it passes CE conformance. I wish to keep switching noise within the DC/DC area as well as filtering out external noise entering into DC/DC.
I have two choices: (a) Simple SMD ferrite beads and COG cap as pi filter (b) SMD X2Y filter (1206J1000103MXTE03). It claims benefits superior to (a).
I have spoken to support and they have very little application note to demonstrate the benefits of the X2Y technology. No PPT presentation. Has anyone use X2Y and how they compare with C-L-C pi filter.