we have problems wiith EMC Conducted Emission EN 55014-1 Cond. with TPS7A78.
We have the following component values:
Rs = 330R
Cs = 470nF
CScin = 470uF + 180uF
Csc1 = 1uF
Csc2 = 1uF
CLDOIn = 10uF
To reach compliance we have to increase Rs to 660R and add a X2 Capcitor with 470nF.
This 470nF X2 capacitor is quite big and expensive.
Is there another way to improve conducted Emissions backwards to mains?
Are there some other ways to improve EMI of TPS7A78 with a cheaper and smaller solution?
When we have to use a 470nF X2 capacitor only for TPS7A78 our cost advantage compared to a standard AC/DC converter is too small and then we will not use TPS7A78.
Thanks for help