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

Doc ID 17273 Rev 1

19/39

   

   

   

 shows the electrical schematic of the EVL6563S-ZRC200 demonstration board, a 

200 W zero-ripple-current PFC pre-regulator (see BOM in 

) based on the boost 

topology modified by adding the cancellation winding to the boost inductor and a capacitor, 
to make a smoothing transformer to minimize the input ripple. 

 lists its electrical 

specifications, while 

 gives the details of the boost inductor.

The design of the pre-regulator is carried out exactly in the same way as for a traditional 
stage. The coupled inductor, the crucial element of this application, is designed following the 
previously outlined procedure.

The controller chip used is the L6563S [

], suitable for implementing transition-mode-

controlled PFC pre-regulators up to 250-300 W. Other notable semiconductor devices used 
are the STF12NM50N (a second generation MDmesh

TM

 0.38 /500 V N-channel MOSFET) 

and the STTH5L06 (a Turbo2 ultrafast diode, optimized for use in transition-mode PFC 
stages).

A prototype of the pre-regulator has been built and evaluated on the bench. The diagrams of 

and 

 show its typical performance;

 

 show some significant 

waveforms.