Datasheet

Application information L6599
20/36
Figure 26. Load-dependent operating modes: timing diagram
Figure 27. How the L6599 can switch OFF a PFC controller at light load
LVG
HVG
1.25V
t
t
t
STBY
50 mV
hyster.
Resonant Mode Burst-m ode
f
osc
Resonant Mode
PFC_STOP
PFC
GATE-DRIVE
L6599
PFC_STOP9
L6561/2
12
Vcc
ZCD
22 k
Ω
100 k
Ω
BC547
BC547
L6599
PFC_STOP9
L6563
PFC_OK
(AC_OK)