FAN7314 — LCD Backlight Inverter Drive IC
October 2007
FAN7314
LCD Backlight Inverter Drive IC
Features
High-Efficiency Single-Stage Power Conversion
Wide Input Voltage Range: 5V to 25.5V
Back Light Lamp Ballast and Soft Dimming
Reduces Number of Required External Components
Precision Voltage Reference Trimmed to 2%
ZVS Half-Bridge Topology
Soft Start
PWM Control at Fixed Frequency
Analog and Burst Dimming Function
Programmable Striking Frequency
Open-Lamp Protection
Open-Lamp Regulation
20-Pin SOIC
Description
The FAN7314 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 CCFL and the
transformer's characteristics.
20-SOIC
Ordering Information
Part Number
FAN7314M
FAN7314MX
Package
20-SOIC
20-SOIC
Operating Temperature Range
-25°C ~ 85°C
Packing Method
Rail
Tape & Reel
All packages are lead free per JEDEC J-SDD-020B standard.
© 2006 Fairchild Semiconductor Corporation
FAN7314 Rev. 1.0.4
www.fairchildsemi.com
FAN7314 — LCD Backlight Inverter Drive IC
Typical Application Circuit
Application
19 inch LCD Monitor
Lamps
4
Input Voltage
13V
1. Schematic
F1
FUSE
C22
220μF
25V
C26
R6
OLP
OLR
RT1
OUTB
OUTA
C6
S_S
GND
C2
1
μF
REF
ADIM
R7
0Ω
BDIM
CT
RT
BCT
R5
C4
27kΩ
4.7nF
VIN
PGND
OUTC
OUTD
C5
220pF
GN
DN
DP
C25
1
μF
C27
1
μF
CN5
1
2
3
4
5
6
7
8
9
10
12505WR-10
0
13V
IC1
FAN7314
0.1
μF
0
82kΩ
M1
0
DN
0
RT
0
SN
OUTB
GN
DN
DP
ON/OFF
R24
10kΩ
C28
10nF
C1
ENA
OUTA
1
μF
R25
10kΩ
SP
C7
10
μF
LTM190EX
TX1
1
HOT
CN1
CCFL
COLD
2
1
HOT
CN2
CCFL
COLD
0
0
0
0.22
μF
0
0
J1
0Ω
GP
DP
0
DIM(0~3.3V)
REF
R2
56kΩ
0
FDS8958A
M2
C8
10
μF
0
SN
DN
0
0
0
0
R27
10kΩ
SP
C10
15pF
C11
15pF
OLP1
2
R4
22kΩ
C21
10nF
R3
18kΩ
OLP2
EA_IN
EA_OUT
C3
4.7nF
R8
GP
DP
0
0
FDS8958A
OLR
D4
BAV70
RT
R15
R26
1kΩ
C14
10nF
R13
1kΩ
C30
10nF
D6
BAV99
R17
1kΩ
D7
BAV99
R16
1kΩ
FB
100kΩ
R9
9.1kΩ
10kΩ
0
0
0
FB
0
0
0
0
0
OLR
REF
R1
330kΩ
R14
100kΩ
0
TX2
1
HOT
CN3
CCFL
COLD
OLP1
R22
10kΩ
R23
10kΩ
OLP2
1
HOT
CN4
CCFL
COLD
2
OLP
0
D11
BAW56
0
C9
1
μF
C12
15pF
C13
15pF
2
Q1
KST2222
D1
BAW56
OLP3
OLP4
OLP3
R20
10kΩ
D10
BAW56
C18
2.2nF
C17
2.2nF
R21
10kΩ
OLP4
C19
2.2nF
C20
2.2nF
0
0
OLR
D3
BAV70
R12
1kΩ
C29
10nF
R11
1kΩ
C15
10nF
D8
BAV99
R18
1kΩ
D9
BAV99
R19
1kΩ
0
0
0
0
0
0
0
0
0
0
0
FB
FAN7314 Rev. 02
2. Transformer Schematic Diagram
Supported by Namyang electronics (http://www.namyangelec.co.kr)
FAN7314 Rev. 02
3. Core & Bobbin
Core: EFD2124
Material: PL7
Bobbin: EFE2124
© 2006 Fairchild Semiconductor Corporation
FAN7314 Rev. 1.0.4
10
www.fairchildsemi.com