
Application examples and ideas
6
Application examples and ideas
L6566B
Figure 28. Typical low-cost application schematic
F1
f use
NTC1
Vin
CY1
B1
88 to CX1
CX2
264 Vac
Lx
C1
R1
CY2
D1
DIS
8
VFF 15
12
MODE/SC
FMOD
6
10
VREF
R3 470k
C3
AC_OK
HVS
Vcc
16
1
5
GD
4
IC1
L6566B
CS
7
ZCD
13
14 9
3
11
OSC
SS COMP GND
R2
D2
R4
D3
Optional f or
C4 R6
C5
C6
QR operation
Optional f or
QR operation
T1
C2
D4
Vout
C8A,B
C7 2.2 nF Y1
R7
Q1
IC3
1
4
R5
R9
3
2
C9 R8
TL431
R10
Figure 29. Typical full-feature application schematic (QR operation)
F1
fuse
NTC1
Vin
88 to CX1
264 Vac
Lx
CY1
CX2
B1
C1
CY2
T1
R1
C2
D1
R2
D2
R15
C3
1N4148
FMOD
HVS
Vcc
AC_OK
ZCD
R3
6
1
5 11
16
R14
VFF
15
DIS 8
IC1
L6566B
GD
R4
4
Q1
D3 1N4148
CS
7
10
162
13
14 9
3
R5
R18
R13
NTC2
VREF MODE/SC OSC
SS COMP GND
R12
C4
R6
C5
C6
D4
C8A,B
C7 2.2 nF Y1
IC3 PC817A 1
4
3
2
TL431
Vout
R7
R9
C9 R8
R10
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