FAN7346 Datasheet, PDF (15/19 Pages) Fairchild Semiconductor – 4-Channel LED Current Balance Controller

Typical Application Circuit (Backlight)
Application
32~46 Inch LED TV
CN3
CON10
Device
FAN7346
Input Voltage Range
380V
LED String
8-String / 90V / 100mA
Q3
FQT4N25
Q2
FQT4N25
Q1
FQT4N25
C32
open
C31
open
C33
open
R32
R37
R31
0R
0R
0R
FAN7346
Q4
FQT4N25
C34
open
R38
0R
R54
3.9R
R53
3.9R
R52
3.9R
R51
3.9R
C14
1u
IC2
FAN7346
28-SOIC
Q7
FQT4N25
Q6
FQT4N25
Q5
C35
FQT4N25 open
C36
open
C37
open
R55
R56
R57
0R
0R
0R
FAN7346
Q8
FQT4N25
C38
open
R58
0R
R58
3.9R
R57
3.9R
R56
3.9R
R55
3.9R
C20
1u
IC3
FAN7346
28-SOIC
REF1 5V
R19 R18
0R open
R17
1k
ZD102
U2A
1
2
PC817A
open
SOD-123
R12
open
C203
100uF/200V
R1
1M
C202
100uF/200V
C1
10n
R2
12k
PWM3 PWM2 PWM1 ENA
PWM4
REF1
R910k
R11
10k
C3
open
R3
C2
100k
10n
R5
R4
10k
R6
open
REF1
C6
1n
R10
100k
C11
1u
REF1
C10
1n
Rop1e3n
C201
100uF/200V
D211
FEP16JT ₀
D212
FEP16JT
TM103
EER39HS-16
CN6
CON10
VCC2
R720R
R710R
PWM7 PWM6 PWM5 ENA
C19
1n
PWM8
REF2
R25
10k
R26100k
R27
10k
VCC2
C13
22uF/50V
C12
1u
R14
22R
ENA
C4
10n
R8
10k
R23
open
REF2
R24
open
C102
MPE630V223J
D101
UF4007
R106
10R
C106
R7
1k
2A224K
M101
FDD5N50F
M102
FDD5N50F
R109
10k
R110
10k
R107
3.3R
D101
LMBD914
R108
3.3R
D102
LMBD914
U1
FAN7621
16-SOIC
FAN7621 12.LVcc
16.PG
10.SG
R113
390k
U5
2N2907 R112
U4
ZD101
2N2222
10k
R114
10k
6.8V/1N4736
C105
0.33uF/25V
C109
25V/47uF
VCC1
R109
R110
R111
1M
1M
47k
C112
680pF/50V
R107
C107
1.8k
R105
16V / 33uF
C108
C103
100pF/50V
R102
1k
4.7k
R104
910R
12nF/100V
4
3
U2B
PC817A
R101
0.1R/1W
0
CN5
CON3
VC C 1
0
CN6
CON3
VCC2
C16
1u
REF2
C22
1n
R28 open
F2
FUSE
C101
0
220uF/450V
PFC_OUT(380Vdc)
© 2011 Fairchild Semiconductor Corporation
FAN7346 • 1.0.0
Figure 32. LCD Backlight Driver
15
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