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Input filter for LED driver (buck topology)

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morf_84

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Hi everyone,

Right now i'm working on LED driver powered from mains (230V AC). I have some questions connected with input filter? I want to use differential mode choke and two X capacitors. My question is about common mode currents. If they are big problem in buck converter. I read that the are a problem in flyback converter and they emerge on a transformer. How abouts buck? If i should use common mode choke instead of differential mode choke. I have place on PCB only for 3 elements(2 caps and choke). Power draw from the mains is near 40 W.
 

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