STMicroelectronics 400 W FOT-controlled PFC pre-regulator with the L6563S EVL6563S-400W EVL6563S-400W Data Sheet

Product codes
EVL6563S-400W
Page of 38
   
   
   
Test results and significant waveforms
AN2994
12/38
 Doc ID 15796 Rev 2
2.2 
Inductor current in FOT and L6563S THD optimizer
The following figures show the waveforms of the inductor current at different voltage mains: 
as shown in 
, the inductor current waveform over the half-period of a 
line is very similar to that of a CCM PFC. 
 an
 (magnifications of the 
waveforms at the peak of the sine wave), show the different ripple currents and OFF times, 
which are modulated by the input mains voltage. It is also possible to note the transition 
angle from DCM to CCM, which occurs closer to the zero crossing of the current sine wave 
at low mains and moves towards the top if the circuit is working at high mains.
         
Figure 17.
EVL6563S-400W inductor current 
ripple envelope at 115 Vac, 60 Hz, 
full load
Figure 18.
EVL6563S-400W inductor current 
ripple (detail) at 115 Vac, 60 Hz, 
full load
         
         
CH1: Q1/Q2 drain voltage
CH1: Q1/Q2 drain voltage
CH2: MULT voltage - pin #3
CH2: MULT voltage - pin #3
CH4: L4 inductor current ripple envelope
CH4: L4 inductor current ripple envelope