Fairchild FAN7311N Lcd backlight inverter drive ic Datasheet

FAN7311
LCD Backlight Inverter Drive IC
Features
Description
„ High-Efficiency Single-Stage Power Conversion
The FAN7311 provides all the control functions for a
series parallel resonant converter as well as a pulse
width modulation (PWM) controller to develop a supply
voltage. Typical operating frequency range is between
30kHz and 250kHz, depending on the cold cathode fluorescent lamp (CCFL) and the transformer's characteristics. FAN7311 uses a new patented phase-shift control.
„ 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
20-SSOP
20-SOIC
„ Open-Lamp Protection
„ Open-Lamp Regulation
„ 20-Pin SSOP/SOIC/DIP
1
Applications
1
„ LCD TV
20-DIP
„ LCD Monitor
1
Ordering Information
Part Number
Package
Operating Temperature Range
Packing Method
FAN7311G
20-SSOP
Rail
FAN7311GX
20-SSOP
Tape & Reel
FAN7311M
20-SOIC
FAN7311MX
20-SOIC
Tape & Reel
20-DIP
Rail
FAN7311N
-25°C to 85°C
Rail
All packages are lead free per JEDEC: J-STD-020B standard.
Protected by U.S. Patent: 5,652,479; 7,158,390.
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.7
www.fairchildsemi.com
FAN7311 — LCD Backlight Inverter Drive IC
December 2007
Application
Lamps
Input Voltage
19-inch LCD Monitor
4
13V
1. Schematic
F1
FUSE
C22
220μF
25V
C25
1μF
1
2
3
4
5
6
7
8
9
10
IC1
0
0.1μF
C26
FAN7311
0
12V
ON/OFF
OLP
RT1
OLR
OUTB
ENA
12505WR-10
0
0
RT
0
C6 1μF
0
PGND
0
DP
GP
DP
C7
10μF
LTM190EX
TX1
1
HOT
REF
OUTC
ADIM
OUTD
1
0
0Ω
R3
18kΩ
C3
CN1
CCFL
2
M2
0
R7
C5
BDIM
CT
EA_IN
RT
SN
DN
GN
DN
COLD
R5
27kΩ
C4
4.7nF
SP
DP
GP
R27
10kΩ
0
DP
2
C11
15pF
COLD
OLP1
OLP2
FDS8958A
0
BCT
HOT
CN2
CCFL
C10
15pF
220pF
0
4.7n
EA_OUT
0
DN
SP
0
J1
1μF
C2
REF
C21
10nF
GN
0
FDS8958A
0
VIN
GND
R2
56kΩ
R4
22kΩ
DN
C8
10μF
0
DIM(0~3.3V)
R25
10kΩ
OUTA
OUTA
S_S
SN
OUTB
C1 0.22μF
C28
10nF
0
82kΩ
R6
R24
10kΩ
C27
1μF
M1
CN5
D6
BAV99
OLR
0
R26
1kΩ
RT
D4
BAV70
C14
10nF
R13
1kΩ
C30
10nF
D7
BAV99
R16
1kΩ
R17
1kΩ
FB
R8
100kΩ
0
R15
10kΩ
R9
9.1kΩ
0
0
0
0
0
0
0
FB
TX2
1
0
OLR
CN3
CCFL
1
REF
OLP1
R22
10kΩ
OLP2
CN4
CCFL
R23
10kΩ
2
C12
15pF
Q1
COLD
C13
15pF
OLP3
C9
1μF
COLD
HOT
0
R1
330kΩ
OLP
HOT
2
R14
100kΩ
OLP4
KST2222
D11
BAW56
OLP3
OLP4
C19
2.2nF
C20
2.2nF
D3
BAV70
OLR
D1
BAW56
R20
10kΩ
R21
10kΩ
0
1kΩ
0
0
D10
BAW56
C18
2.2n
C29
10nF
R12
0
0
0
C15
10nF
0
0
D9
BAV99
R18
1kΩ
0
0
R19
1kΩ
0
FB
C17
2.2n
0
R11
1kΩ
D8
BAV99
0
FAN7311 Rev. 04
Figure 10. Typical Application Circuit
2. Transformer Schematic Diagram
- Supported by Namyang electronics (http://www.namyangelec.co.kr)
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
5 --> 2
7 --> 9
1 UEW 0.45 φ
19
115 µH
21.5µH
1KHz, 1V
1 UEW 0.04 φ
2300
1.5 H
280mH
1KHz, 1V
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.7
Remarks
www.fairchildsemi.com
10
FAN7311 — LCD Backlight Inverter Drive IC
Typical Application Circuits
FAN7311 — LCD Backlight Inverter Drive IC
© 2006 Fairchild Semiconductor Corporation
FAN7311 Rev. 1.0.7
www.fairchildsemi.com
15
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