Input capacitor dissipation

For the Buck, we see that the input capacitor RMS actually maxes out at D = 50%, whereas the output capacitor RMS current (curve number 12) increases dramatically at low D (high input). Does that really mean that we have to worry about the dissipation in the output capacitor Think about it. The output capacitor in a Buck is barely responsible for any of its losses, since it sees only the smoothened (undulating) inductor current. So yes, as a... 

Example What is the DM noise spectrum measured at the LISN for a 5 V 15 A flyback at an input of265 VAC, with a transformer turns ratio of 20 We are using an aluminum electrolytic bulk capacitor whose datasheet states that it has a capacitance of270 p,F, a dissipation factor (tangent of loss angle) of tan S = 0.15 as measured at 120 Hz, and a frequency multiplier factor of 1.5 at 100 kHz. 

In order to study forced systems the concept of passivity is introduced. A passive system is a dissipative system where the net supply of stored quantity is a function of the measured outputs and manipulated inputs only [13]. The concept passivity originates from electronic circuit theory, where passive components are e.g. resistors and capacitors. 

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