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AN-6016

Description
LCD Backlight Inverter Drive IC
File Size460KB,18 Pages
ManufacturerFairchild
Websitehttp://www.fairchildsemi.com/
Download Datasheet View All

AN-6016 Overview

LCD Backlight Inverter Drive IC

www.fairchildsemi.com
Application Note AN6016
LCD Backlight Inverter Drive IC (FAN7311)
1. Description
Design goals for a Cold Cathode Fluorescent Lamp (CCFL)
inverter for use in a notebook computer or other portable
applications include small size, high efficiency, and low cost.
The FAN7311 provides the necessary circuit blocks to
implement a highly efficient CCFL backlight power supply
in 20-SSOP and 20-SOIC packages. The FAN7311 typically
consumes less than 4mA of operating current, improving
overall system efficiency. External parts count is minimized
and system cost is reduced by the integration of features
including; feedback-controlled Pulse Width Modulation
tm
(PWM) driver stage, soft start, open lamp regulation, and
Under Voltage Lockout protection (UVLO).
The FAN7311
includes an internal shunt regulator that allows operation
with an input voltage from 5V to 25.5V. It supports analog
and burst dimming modes of operation. The FAN7311 pro-
vides open lamp regulation and protection. Open lamp regu-
lation protects the transformer from over-voltage during start
up or when an open lamp occurs. The transformer voltage is
regulated by reducing duty cycle when an over-voltage is
detected. Open lamp protection can be used to shut down an
IC when an open lamp condition continues longer than a
specified time.
F1
FUSE
CN5
1
2
3
4
5
6
7
8
9
10
12505WR-10
0
DIM (0~3.3V)
REF
R2
56k
12V
C22
220μ
25V
0
IC1 FAN7311
OLP
OLR
ON/OFF
R24
ENA
10k
C28
10n
0
C1
0
0. 2μ
2
0
C2
0
1
μ
R70
BDIM
22k
C21
10n
R3
18k
0
0
EA_IN
C3
EA_OUT BCT
4.7n
RT
R8
100k
R9
9. k
1
R15
FB
10k
D4
BAV70
CT
R527k
RT
C4 4.7n
0
0
REF
ADIM
OUTC
0
OUTD
C5 220p
0
R27
10k
GND
PGND
S_S
VIN
0
J1
0
SN
GN
SP
GP
DN
DN
DP
DP
OLR
R26
1k
0
C14
10n
0
R13
1k
0
FB
0
TX2
1 HOT
CN3
2 COLD CCFL
1
OLP1
R1
330k
Q1
C9
KST2222
OLP3
D1
BAW56
0
BAW56 C18
2. n
2
0
C17
2. n
2
0
D10
R20
10k
R21
10k
OLP4
0
D11
BAW56
C19
2.2n
0
C20
2. n
2
0
R22
10k
R28
10k
OLP2
C12
15p
C13
15p
OLP3
D8
D3
BAV70
R12
1k
0
C29
10n
0
R11
1k
0
FB
C15
10n
0
R18
1k
BAV99
0
0
0
HOT
CN4
CCFL
C30
10n
BAV99
0
0
D6
R16
1k
0
D7
BAV99
0
R17
1k
0
C10
15p
C11
15p
OLP1
M2
1 HOT
2 COLD
CN2
CCFL
OUTA
RT1
OUTB
C25
DN
DN
DP
DP
TX1
C8 10μ
2
COLD
C7 10μ
0
C27
0
M1
C26
R6
0.
0
RT
R25
10k
0
SN
GN
SP
GP
0
82k
OUTB
OUTA
C6
LTM190EX
1
HOT
CN1
CCFL
FDS8958A
R4
OLP2
FDS8958A
OLR
R14
100k
REF
OLP
2 COLD
OLP4
D9
R19
1k
OLR
BAV99
0
Figure 1. Application Circuit
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