Техническая Спецификация для STMicroelectronics 170 W power supply with PFC and standby supply for flat TV using the L6564, L6599A, and Viper27LN EVL EVL170W-FTV

Doc ID 18376 Rev 1

11/47

The main purpose of a PFC pre-regulator is the input current shaping to reduce the 
harmonic content below the limits of the relevant regulations. This demonstration board has 
been tested according to the European standard EN61000-3-2 Class-D and Japanese 
standard JEITA-MITI Class-D, at full load and 75 W input power, at both the nominal input 
voltage mains. 

 to 

 show the test results. Note that the PFC stage operates 

properly as it effectively reduces harmonics well below the limits of both regulations in all 
conditions. Total harmonic distortion and power factor values are reported below in each 
diagram. 

         

         

Vin=230 Vac - 50 Hz, Pin=191 W
THD=4.52 %, PF=0.982

!-V

Vin=100 Vac - 50 Hz, Pin=191 W
THD=3.97 %, PF=0.999

!-V

         

         

!-V

Vin=230 Vac - 50 Hz, Pin=75 W
THD=7.15 %, PF=0.867

!-V

Vin=100 Vac - 50 Hz, Pin=75 W
THD=5.66 %, PF=0.999