STMicroelectronics A 200 W ripple-free input current PFC pre-regulator with the L6563S EVL6563S-200ZRC EVL6563S-200ZRC Fiche De Données

   

   

   

12/39

 Doc ID 17273 Rev 1

5. 

A resonance frequency, close to: 

for small zero-ripple condition mismatches, exists where the gain peaks and attenuation 
may be lost. However, the parasitic resistances damp this peak so that it is not high, even 
though its effect might be visible in the waveforms, should that frequency be stimulated; 
anyhow, to get the desired attenuation at the switching frequency and above, the practical 
values of C

S

 are such that the peak occurs at a much lower frequency, where EMC 

regulations do not generally apply.

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