FAN73402 Datasheet, PDF (14/16 Pages) Fairchild Semiconductor – LED Backlight Driving Boost Switch

Typical Application Circuit (Boost Topology for LED Backlight)
Application Input Voltage Range Rated Output Power
LED Backlight TV
90V_DC 10%
Output Current
(Rated Voltage)
250mA (160V)
LED
48-LEDs/1-String
Features
 High Efficiency
 Constant Current Boost Converters
 High-Voltage, High-Current LED Driving
Typical Application Circuit
CN1
Vin
Vin
Vin
GND
GND
GND
1
2
3
4
5
6
CON6
C1
22uF/160V
0
R21
300k
L1
200uH/PC44
Q1
FDD7N50NF
R1 10R
D2 1SS355 R9
0R
R4
100K
CN3
VCC
GND
FO
BDIM
ADIM
On/Of f
1
2
3
4
5
6
CON6
On/Of f
C14
1.2n
FO
R22
300k
R23
10k
D3
1SS355
ENA
On/Of f
C3
C4
1u
10uF/50V
REF
VCC
TP1
R13 3.9K
TP
R15
220K
R12
100K/open
R14
20K/open
C10
1.2n
R7 _5.1K
VCC
0
C8
10n
FO
ADIM
C5
OPEN
R19
10k
R20
100k
R17 3.9K
R18
220K
C11
1.2n
BDIM
R16
2.7R/1W
D1
1 _VCC
2 _DRV
3 _GND
4 _CS
5 _REF
FFD04H60S
BDIM ¹⁶
ADIM ¹⁵
CMP ¹⁴
OVP ¹³
ENA ¹²
C2
47uF/400V
0
BDIM
ADIM
OVP
C13
1.2n
R2
270k
R5
270k
R6
300k
R10
16k
OVP
C6
6.8n
R11
15k
C7
100n
6 _FAULT
7 _RT
ENA
DRAIN ¹⁰
8 _SENSE
DRAIN ⁹
IC1
FAN734002
CN2
1
2
3
4
5
6
N.C
N.C
VLED
VLED
LED1
LED2
CON6
Vin : 90V
Vout : 160V
Output current : 250mA
Switching frequency : 200kHz
0
Figure 35.
Typical Application Circuit
© 2012 Fairchild Semiconductor Corporation
FAN73402 • 1.0.0
14
www.fairchildsemi.com