Datasheet

AN2994 Test results and significant waveforms
Doc ID 15796 Rev 2 17/38
If you compare Figure 21 and Figure 22 to Figure 23 and Figure 25, you can see that the
input current of the last two figures is much better and the 3
rd
harmonic current distortion is
not noticeable. This demonstrates the benefits of the new voltage feed-forward circuit
integrated in the L6563S, allowing you to get a fast response to mains disturbances and a
very low THD and high PF at the same time.
Figure 25. EVL6563S-400W input mains dip
from 140 to 90 Vac, full load,
C
FF
= 1 µF
Figure 26. L6562A FOT input mains dip from
140 to 90 Vac, full load,
NO V
FF
input
CH1: Output voltage CH1: Output voltage
CH2: Input rectified mains voltage CH2: Input rectified mains voltage
CH3: V
FF
voltage - pin #5 CH4: Input current
CH4: Input current