Datasheet

L6566B Application examples and ideas
45/51
Figure 30. Typical full-feature application schematic (FF operation)
IC1
L6566B
Vout
B1
C1
R4
C3
Q1
R2
D2
1N4148
R18
D1
C7 2.2 nF Y1
C8A,B
T1
ZCD
GD
CS
Vcc
DIS
GND
VFF
COMP
D4
IC3 PC817A
R3
D3 1N4148
3
4
C6
R5
C2
Vin
88 to
264 Vac
F1
fuse
CX1 CX2
CY1
CY2
NTC1
Lx
SS
C5
VREF
MOD E/ SC
C4 R6
HVS
OSC
AC_OK
R1
FMOD
C10
R11
R12
R13
R14
R15
R16
R17
R8
C9
R9
R10
1
2
TL431
R7
NTC2
4
7
3
5
11
6
8
91413
16
10
12 1
15
Table 7. External circuits that determine IC behavior upon OVP and OCP
OVP latched OVP auto-restart
OCP latched
OCP auto-restart
L6566B
AC_OK
16
R
H
VFF
15
R
L1
R
L2
R
FF
R
FF
10 R
L2
SS VREF
14 10
L6566B
AC_OK
16
RH
VFF
15
R
L1
RL2
Diode needed if
46
R
R
1
R103133
2L
1L
1L
3
.
..
+
+
SS VREF
14 10
L6566B
AC_OK
16
R
H
VFF
15
RL1
R
L2
RFF
SS VREF
14 10
1N4148
L6566B
AC_OK
16
R
H
VFF
15
R
L1
R
L2
SS VREF
14 10
1N4148
Diode needed if
46
R
R
1
R103133
2L
1L
1L
3
.
..
+
+