Fairchild (Now ON) FAN7314M, FAN7314M Schematic [ru]
FAN7314
LCD Backlight Inverter Drive IC
FAN7314 — LCD Backlight Inverter Drive IC
October 2007
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 Package Operating Temperature Range Packing Method
FAN7314M 20-SOIC
FAN7314MX 20-SOIC Tape & Reel
All packages are lead free per JEDEC J-SDD-020B standard.
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN7314 Rev. 1.0.4
-25°C ~ 85°C
Rail
Typical Application Circuit
Application Lamps Input Voltage
19 inch LCD Monitor 4 13V
1. Schematic
F1
FUSE
C22
220μF
CN5
12505WR-10
1
13V
2
3
4
5
6
7
8
9
ON/OFF
10
0
DIM(0~3.3V)
25V
0
R24
10kΩ
C28
10nF
0
REF
R2
56kΩ
R4
C21
22kΩ
R3
10nF
18kΩ
0
0
C9
1
μF
0
IC1 FAN7314
OLP
RT1
OLR
OUTB
ENA
0.22
C3
4.7nF
330kΩ
REF
R1
D1
BAW56
OUTA
μF
S_S
VIN
GND
PGND
1
μF
REF
OUTC
ADIM
OUTD
BDIM
EA_IN
EA_OUT
BCT
R8
100kΩ
R14
100kΩ
0
D10
BAW56
C1
0
0
C2
0
R7 0Ω
OLP
Q1
KST2222
CT
RT
D11
BAW56
C26
R6 82kΩ
C6
1
C5 220pF
R5 27kΩ
C4 4.7nF
OLP3 OLP4
R20
10kΩ
C18
2.2nF
0
OUTB
OUTA
μF
FAN7314 — LCD Backlight Inverter Drive IC
C25
C27
1
1
μF
0.1
μF
0
RT
10kΩ
0
0
J1
0
0
0
RT
OLR
R21
10kΩ
C17
2.2nF
0
M1
0
SN
DN
GN
DN
C7
10
μF
DP
R25
0Ω
SP
DP
GP
FDS8958A
M2
0
SN
GN
SP
R27
10kΩ
GP
FDS8958A
R15
10kΩ
R9
9.1kΩ
C8
μF
10
DN
DN
DP
DP
FB
0
R22
10kΩ
C19
2.2nF
OLP2OLP1
R23
10kΩ
C20
2.2nF
00
μF
0
0
C11
15pF
OLP1
C30
R13
10nF
1kΩ
0
C13
15pF
OLP3 OLP4
R11
C15
1kΩ
10nF
0
LTM190EX
1
HOT
2
COLD
D6
BAV99
R17
1kΩ
0
0
1
HOT
2
COLD
D8
BAV99
R18
1kΩ
0
0
1
HOT
CN1
CCFL
2
COLD
CN2
CCFL
OLP2
D7
BAV99
R16
1kΩ
0
1
HOT
CN3
CCFL
2
COLD
CN4
CCFL
D9
BAV99
R19
1kΩ
0
0
TX1
0
OLR
TX2
0
OLR
C10
15pF
D4
C14
BAV70
R26
10nF
1kΩ
0 0
0 0
FB
C12
15pF
D3
BAV70
R12
C29
1kΩ
10nF
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 www.fairchildsemi.com
FAN7314 Rev. 1.0.4 10
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