Fairchild FAN7311G, FAN7311M, FAN7311N, FAN7311G, FAN7311M Schematics
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FAN7311
LCD Backlight Inverter Drive IC
FAN7311 — LCD Backlight Inverter Drive IC
December 2007
Features
High-Efficiency Single-Stage Power Conversion
Wide Input Voltage Range: 5V to 25.5V
Backlight Lamp Ballast and Soft Dimming
Reduced Number of Required External Components
Precision Voltage Reference Trimmed to 2%
ZVS Full-Bridge Topology
Soft-Start Capability
PWM Control at Fixed Frequency
Analog and Burst Dimming Function
Programmable Striking Frequency
Open-Lamp Protection
Open-Lamp Regulation
20-Pin SSOP/SOIC/DIP
Applications
LCD TV
LCD Monitor
Description
The FAN7311 provides all the co ntrol fu nctions for a
series p arallel resonant co nverter as well as a pu lse
width m odulation (PWM) controller t o develop a s upply
voltage. T ypical op erating fre quency ran ge is bet ween
30kHz and 250kHz, depending on the cold cathode fluorescent lamp (CCFL) and the transformer's characteristics. FAN7311 uses a new proprietary phase-shift control.
20-SSOP
1
20-DIP
1
20-SOIC
1
Ordering Information
Part Number Package Operating Temperature Range Packing Method
FAN7311G 20-SSOP
FAN7311GX 20-SSOP Tape & Reel
FAN7311M 20-SOIC Rail
FAN7311MX 20-SOIC Tape & Reel
FAN7311N 20-DIP Rail
All packages are lead free per JEDEC: J-STD-020B standard.
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN7311 Rev. 1.0.7
-25°C to 85°C
Rail
Typical Application Circuits
Application Lamps Input Voltage
19-inch LCD Monitor 4 13V
FAN7311 — LCD Backlight Inverter Drive IC
1. Schematic
F1
FUSE
C22
CN5
12505WR-10
220μF
25V
1
12V
2
3
4
5
6
7
8
9
ON/OFF
10
0
DIM(0~3.3V)
22kΩ
0
R24
10kΩ
C28
10nF
0
REF
R2
R4
56kΩ
R3
C21
10nF
18kΩ
0
0
C9
1μF
0
IC1 FAN7311
OLP
OLR
ENA
C1 0.22μF
0
S_S
0
GND
C2 1μF
0
REF
ADIM
R7
0Ω
BDIM
EA_IN
C3 4.7n
EA_OUT
REF
R1
OLP
330kΩ
Q1
KST2222
D11
BAW56
D1
BAW56
D10
BAW56
0.1μF
C26
0
82kΩ
R6
OUTB
OUTA
C6 1μF
C5 220pF
R5 27k Ω
4.7nF
C4
RT
OLR
OLP3 OLP4
R21
10kΩ
C17
2.2n
RT
0
0
J1
0
0
0
0
R9
9.1kΩ
0
RT1
OUTB
OUTA
VIN
PGND
OUTC
OUTD
CT
RT
BCT
R8
100kΩ
R14
100kΩ
0
R20
10kΩ
C18
2.2n
0
M1
0
SN
DN
GN
DN
DP
SP
R25
10kΩ
FDS8958A
0
R27
10kΩ
FDS8958A
R15
10kΩ
0
R22
R23
10kΩ
10kΩ
C19
C20
2.2nF
2.2nF
C7
10μF
DP
GP
M2
SN
GN
SP
GP
C8
10μF
DN
DN
DP
DP
FB
OLP2OLP1
00
Figure 10. Typical Application Circuit
2. Transformer Schematic Diagram
- Supported by Namyang electronics (http://www.namyangelec.co.kr)
C25
C27
1μF
1μF
0
0
D6
BAV99
0
D8
BAV99
1
2
R16
1kΩ
0
1
2
R18
1kΩ
0
0
LTM190EX
HOT
CN2
CCFL
COLD
OLP2
HOT
CN4
CCFL
COLD
1
HOT
CN1
CCFL
2
COLD
D7
BAV99
R17
1kΩ
0
1
HOT
CN3
CCFL
2
COLD
D9
BAV99
R19
1kΩ
0
0
TX1
C11
C10
15pF
15pF
OLR
OLR
R26
C14
1kΩ
D4
BAV70
TX2
10nF
0 0
0 0
C12
15pF
D3
BAV70
C29
R12
1kΩ
10nF
0 0
0
OLP1
C30
R13
10nF
1kΩ
0
FB
C13
15pF
OLP3 OLP4
R11
C15
10nF
1kΩ
0
FB
FAN7311 Rev. 04
FAN7311 Rev. 04
Figure 11. Transformer Schematic
3. Core & Bobbin
Core: EFD2124
Material: PL7
Bobbin: EFE2124
4. Winding Specification
Pin No. Wire Turns Inductance Leakage Inductance Remarks
5 --> 2 1 UEW 0.45 φ 19 115 µH 21.5µH 1KHz, 1V
7 --> 9 1 UEW 0.04 φ 2300 1.5 H 280mH 1KHz, 1V
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN7311 Rev. 1.0.7 10
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