FAN7314MX [FAIRCHILD]
LCD Backlight Inverter Drive IC; LCD背光逆变器驱动IC
| 型号： | FAN7314MX |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | LCD Backlight Inverter Drive IC |
| 文件： | 总14页 (文件大小：544K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 2006
FAN7314
LCD Backlight Inverter Drive IC
Features
■ High-efficiency single-stage power conversion
Description
■ 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
The FAN7314 provides all the control functions for use
as 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.
■ Soft start
■ PWM control at fixed frequency
■ Analog and burst dimming function
■ Programmable striking frequency
■ Open lamp protection
■ Open lamp regulation
■ 20-Pin SOIC
Ordering Information
Product number
FAN7314M
Package
Operating Temperature
20-SOIC
-25°C to 85°C
FAN7314MX
FPS™ is a trademark of Fairchild Semiconductor Corporation.
©2006 Fairchild Semiconductor Corporation
FAN7314 Rev. 1.0.1
1
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Internal Block Diagram
RT
OUTA
Oscillator
Output
Driver
max. 2V
OUTB
PGND
OUTC
min. 0.5V
Output
Control
Logic
CT
–
+
6µA
+
S_S
2.65V
Output
Driver
OUTD
MRT1
RT1
OLP
S_S
Striking
Logic
1.4µA
UVLO
EA_OUT
ADIM
OLP
OLR
+
–
SET
CLR
VOLP+α
VOLP
Q
Q
S
R
Error Amp.
+
–
2.5V 1.5V
UVLO
EA_IN
2.5V
+
–
Solr
Solr 105µA
Sburst 85µA
2V
2.5VREF
REF
ENA
VIN
Va+α
max. 2V
Voltage
Reference
&
min. 0.5V
Internal Bias
BCT
BDIM
AGND
–
+
+
–
Sburst
1.4V
VIN
+
–
UVLO
UVLO 5V
2
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FAN7314 Rev. 1.0.1
Pin Assignments
RT1 OUTB OUTA VIN
PGND OUTC OUTD
16
14
CT
13
RT
12
BCT
11
20
19
18
17
15
FAN7314
2
3
4
5
6
7
8
9
1
10
OLP
OLR
ENA
S_S
GND
REF ADIM BDIM EA_IN EA_OUT
Pin Definitions
Pin Number
Pin Name
OLP
Pin Function Description
1
2
Open Lamp Protection
Open Lamp Regulation
Enable Input
OLR
3
ENA
4
S_S
Soft Start
5
GND
Analog Ground
6
REF
2.5V Reference Voltage
Analog Dimming Input
Burst Dimming Input
Error Amplifier Input
Error Amplifier Output
Burst Dimming Timing Capacitor
Timing Resistor
7
ADIM
BDIM
EA_IN
EA_OUT
BCT
8
9
10
11
12
13
14
15
16
17
18
19
20
RT
CT
Timing Capacitor
OUTD
OUTC
PGND
VIN
NMOSFET Drive Output D
PMOSFET Drive Output C
Power Ground
Supply Voltage
OUTA
OUTB
RT1
PMOSFET Drive Output A
NMOSFET Drive Output B
Striking Frequency Resistor
3
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FAN7314 Rev. 1.0.1
Absolute Maximum Ratings
For typical values T = 25°C, V = 12V and for min/max values T is the operating ambient temperature range with
A
CC
A
–25°C ≤ T ≤ 85°C and 5V ≤ V ≤ 25.5V, unless otherwise specified.
A
CC
Symbol
Parameter
Value
5 to 25.5
-25 to 85
150
Unit
V
V
Supply Voltage
CC
Topr
Tj
Operating Temperature Range
Junction Temperature
°C
°C
Tstg
Storage Temperature Range
Thermal Resistance Junction-Air
Power Dissipation
-65 to 150
70
°C
(1, 2)
R
°C/W
W
θJA
Pd
1.8
Notes:
1. Thermal resistance test board:
Size: 76.2mm x 114.3mm x 1.6mm(1S0P)
JEDEC standard: JESD51-2, JESD51-3
2. Assume no ambient airflow.
ESD Level
Parameter
Pins
Conditions
Level
2000
300
Unit
Human Body Model (HBM) All pins
R = 1.5kΩ, C = 100pF
V
Machine Model (MM)
All pins except for BDIM C = 200pF
BDIM
250
Electrical Characteristics
For typical values T = 25°C, V = 12V and for min/max values T is the operating ambient temperature range with
A
CC
A
–25°C ≤ T ≤ 85°C and 5V ≤ V ≤ 25.5V, unless otherwise specified.
A
CC
Symbol
Characteristics
Test Condition
Min.
Typ.
Max.
Unit
REFERENCE SECTION (Recommend X7R Capacitor)
∆Vref
Line Regulation
5 ≤ V ≤ 25.5V
–
2
25
mV
V
CC
V25
2.5V Regulation Voltage
2.45
2.5
2.55
OSCILLATOR SECTION (Main)
fosc
Oscillation Frequency
T = 25°C, Ct = 270pF
110.4
115
119.6
kHz
A
Rt = 18k
Ct = 270pF, Rt = 18k
108
–
115
2.0
0.5
122
–
Vcth
Vctl
CT High Voltage
CT Low Voltage
V
V
–
–
OSCILLATOR SECTION (Burst)
foscb
Oscillation Frequency
T = 25°C, Ctb = 10nF,
204.75
225
245.25
Hz
A
Rt = 18k
Ctb = 10nF, Rt = 18k
201
–
225
2
248
–
Vbcth
Vbctl
BCT High Voltage
BCT Low Voltage
V
V
–
0.5
–
4
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FAN7314 Rev. 1.0.1
Electrical Characteristics (Continued)
For typical values T = 25°C, V = 12V and for min/max values T is the operating ambient temperature range with
A
CC
A
–25°C ≤ T ≤ 85°C and 5V ≤ V ≤ 25.5V, unless otherwise specified.
A
CC
Symbol
Characteristics
Test Condition
Min.
Typ.
Max.
Unit
ERROR AMP SECTION
(1)
Open Loop Gain
–
–
80
1.5
2.4
–
–
–
dB
MHz
V
(1)
Unit Gain Bandwidth
Veh
lsin
Feedback Output High Voltage
Output Sink Current
EA_IN = 0V
2.13
–
2.57
-1
EA_OUT = 1.5V
EA_OUT = 1.5V
mA
mA
µA
lsur
Output Source Current
1
–
–
Iolr
EA_IN Driving Current On OLR
75
61
105
85
135
109
Iburst
EA_IN Driving Current On Burst
Dimming
µA
Vfbh
Feedback High Voltage On Burst
Dimming
R(EA_IN) = 60kΩ
Va + 0.1 Va + 0.4
Va + 0.7
V
SOFT START SECTION
I
Soft Start Current
S_S = 2V
4
6
8
3
µA
V
SS
Vssh
Soft Start Clamping Voltage
2.3
2.65
PROTECTION SECTION
Volp0
Volp1
Volr
Open Lamp Protection Voltage 0
Start at open lamp
2.2
1.3
2.5
1.5
2
2.8
1.7
V
V
Open Lamp Protection Voltage 1
Open Lamp Regulation Voltage
Normal → open lamp
1.75
0.7
2.25
2.1
V
Iolp
Open Lamp Protection Charging
Current
1.4
µA
UNDER VOLTAGE LOCK OUT SECTION
Vth
Ist
Start Threshold Voltage
Start Up Current
–
–
–
–
–
5
V
V
V
V
= Vth–0.2
= 12V
130
1.5
200
180
4
µA
mA
µA
CC
CC
CC
Iop
Isb
Operating Supply Current
Stand-by Current
= 12V
370
ON/OFF SECTION
Von
Voff
On State Input Voltage
Off Stage Input Voltage
2
–
–
–
5
V
V
0.7
OUTPUT SECTION
Vpdhv PMOS Gate High Voltage
V
V
V
V
V
= 12V
–
Vcc
–
V
V
V
V
V
CC
CC
CC
CC
CC
Vphlv
PMOS Gate Low Voltage
= 12V
Vcc–10.5 Vcc–8.5 Vcc–6.5
Vndhv NMOS Gate Drive Voltage
Vndhv NMOS Gate Drive Voltage
= 12V
6.5
–
8.5
0
10.5
–
= 12V
Vpuv
PMOS Gate Voltage With UVLO
Activated
= Vth–0.2
Vcc–0.3
–
–
Vnuv
NMOS Gate Voltage With UVLO
Activated
V
= Vth–0.2
–
–
0.3
V
CC
(1)
Tr
Tf
Rising Time
V
V
= 12V, Cload = 2nF
= 12V, Cload = 2nF
–
–
200
200
500
500
ns
ns
CC
CC
(1)
Falling Time
5
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FAN7314 Rev. 1.0.1
Symbol
Characteristics
Test Condition
Min.
Typ.
Max.
Unit
MAX./MIN. OVERLAP
Min. Overlap Between Diagonal
Switches
fosc = 100kHz
–
–
0
–
–
%
%
(1)
Max. Overlap Between Diagonal
fosc = 100kHz
100
(1)
Switches
DELAY TIME
PDR_A/NDR_B
(1)
(1)
Rt = 18k
Rt = 18k
–
–
450
450
–
–
ns
ns
PDR_C/NDR_D
Notes:
1. These parameters, although guranteed, are not 100% tesed in production.
2. Specifications to -25°C to 85°C are guaranteed by design based on final characterization results.
6
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FAN7314 Rev. 1.0.1
Function Description
UVLO: The under voltage lockout circuit guarantees
stable operation of the IC’s control circuit by stopping
and starting operation as a function of the Vin value. The
UVLO circuit turns on the control circuit when Vin
exceeds 5V. When Vin is lower than 5V, the IC’s standby
current is less than 200µA.
ENA: Applying voltage higher than 2V to the ENA pin
enables the operation of the IC. Applying voltage lower
than 0.7V to the ENA pin will disable the operation of the
inverter.
Soft start: The soft start function requires that the S_S
pin is connected through a capacitor to GND. A soft start
circuit ensures a gradual increase in the input and output
power. The capacitor value connected to the S_S pin
determines the rate at which the duty ratio rises. It is
charged by a 6µA current source.
Burst oscillator & burst dimming: The timing capaci-
tors (BCTs) are charged by the reference current source,
which is formed by the timing resistor (R ). The timing
T
resistor’s voltage is regulated at 1.25V. The sawtooth
waveform charges up to 2V. Once this voltage is
reached, the capacitors begin discharging down to 0.5V.
Next the timing capacitors start charging again and a
new switching cycle begins. The burst dimming fre-
quency can be programmed by adjusting the R and
T
BC values. The burst dimming frequency can be calcu-
T
lated as shown below:
3.75
f
= -----------------------------------
burst
96 R BC
T
T
To avoid visible flicker, the burst dimming frequency
should be greater than 120Hz.
Main oscillator: The timing capacitors (CTs) are
charged by the reference current source. The current
By comparing the input of BDIM pin with the 0.5 to 2V
triangular wave of the burst oscillator, the PWM pulses
for burst dimming. The PWM pulse controls EA_OUT’s
voltage by summing 85µA into the EA_IN pin.
source is formed by the timing resistor (R ). The timing
T
resistor’s voltage is regulated at 1.25V. The sawtooth
waveform (see top of next column) charges up to 2V.
Once this voltage is reached, the capacitors begin dis-
charging down to 0.5V. Next, the timing capacitors start
charging again and a new switching cycle begins. The
main frequency can be programmed by adjusting the R
T
and C values. The main frequency can be calculated as
T
shown below:
19
f
= ------------------------------
op
32 R
C
T
T
7
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FAN7314 Rev. 1.0.1
Open lamp regulation & open lamp protection: It is
necessary to suspend power stage operation if an open
lamp occurs, because the power stage has high gain.
When a voltage higher than 2V is applied to the OLR pin,
the part enters regulation mode and controls the
EA_OUT voltage. This limits the lamp voltage by sum-
ming 105µA into the feedback node. At the same time,
the OLP capacitor, connected to the OLP pin, is charged
by the 1.4µA internal current source. Once it reaches
2.5V, the IC enters shut down where all the output is
high.
Output Drives: The four output drives are designed so
that switches A and B, C and D never turn on simulta-
neously. The OUTA-OUTB pair is intended to drive one
half-bridge in the external power stage. The OUTC-
OUTD pair will drive the other half-bridge.
8
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FAN7314 Rev. 1.0.1
Timing Diagram
The FAN7314 uses the half-bridge to drive CCFL.
EA_OUT
CT
SYNC
T
POUT A
NOUT B
POUT C
NOUT D
9
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FAN7314 Rev. 1.0.1
Typical Application Circuit
Application
Lamps
Input Voltage
19 inch LCD Monitor
4
13V
1. Schematic
F1
FUSE
C22
C25
1u
C27
1u
220u
25V
CN5
C26 0.1u
IC1
FAN7314
0
M1
0
0
0
1
2
3
4
5
6
7
8
9
10
13V
R6 82k
OLP
RT1
OUTB
OUTA
VIN
0
RT
SN
GN
SP
GP
DN
DN
DP
DP
OUTB
OUTA
OLR
R25
10k
R24
10k
C7 10u
C8 10u
ON/OFF
LTM190EX
ENA
C1 0.22u
C6
1u
TX1
C28
10n
1
2
0
0
0
S_S
0
0
HOT
12505WR-10
CN1
CCFL
0
FDS8958A
M2
GND
REF
PGND
OUTC
OUTD
CT
0
J1
0
COLD
C2 1u
REF
1
DIM (0~3.3V)
HOT
0
CN2
SN
GN
SP
DN
DN
DP
DP
R2
56k
CCFL
ADIM
BDIM
EA_IN
EA_OUT
R4
22k
2
0
COLD
R7
0
C5 220p
R5 27k
C10
15p
C11
15p
R27
10k
0
0
0
OLP1
OLP2
C21
10n
R3
18k
RT
C3
C4
GP
BCT
D4
BAV70
D6
D7
FDS8958A
4.7n
4.7n
0
0
OLR
C14
10n
C30
10n
BAV99
BAV99
R26
1k
R13
1k
R17
1k
R16
1k
RT
R8
R15
10k
FB
0
0
0
0
0
0
0
0
100k
R9
9.1k
FB
TX2
1
2
HOT
OLR
0
CN3
CCFL
R14
100k
REF
COLD
OLP1
OLP2
1
2
HOT
R1
330k
R22
10k
R23
10k
0
OLP
CN4
CCFL
0
C12
15p
C13
15p
COLD
D11
C9
1u
BAW56
Q1
KST2222
OLP3
OLP4
OLP3
OLP4
C19
2.2n
C20
2.2n
D1
BAW56
R20
10k
R21
10k
D3
BAV70
D8
D9
BAV99
0
0
OLR
BAV99
R12
1k
C29
10n
R11
1k
C15
10n
R18
1k
R19
1k
D10
BAW56
0
0
0
0
0
0
0
0
0
C18
2.2n
C17
2.2n
0
0
FB
2.Transformer Schematic Diagram
Supported by Namyang electronics (http://www.namyangelec.co.kr)
1
9
7
6
9
8
7 6 5 4 3 2 1
3. Core & Bobbin
■ Core: EFD2124
■ Material: PL7
■ Bobbin: EFE2124
10
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FAN7314 Rev. 1.0.1
4. Winding Specification
Pin No.
5 → 2
Wire
Turns
12
Inductance
180µH
Leakage Inductance
Remarks
1KHz, 1V
1KHz, 1V
1 UEW 0.45 φ
1 UEW 0.04 φ
7.2µH
7 → 9
2430 (270 x 9)
7.2H
330mH
5. BOM of the Application Circuit
Part Ref.
Value
Description/Vendor
Part Ref.
Value
220p
1µ
Description/Vendor
50V 1608 J
50V 2012 K
16V 3216
Fuse
C5
F1
24V 3A
Fuse
C6
Resistor (SMD)
C7
10µ
10µ
1µ
R1
R2
330K
56K
18K
22K
27K
82K
100K
9.1K
1K
1608 J
1608 F
1608 F
1608 F
1608 F
1608 F
1608 F
1608 F
1608 F
1608 F
1608 F
1608 F
1608 F
1608 F
1608 F
1608 F
1608 F
1608 J
1608 J
1608 J
1608 J
1608 J
1608 J
1608 F
1608 J
C8
16V 3216
C9
16V 1608 K
3KV 3216
R3
C10
C11
C12
C13
C14
C15
C17
C18
C19
C20
C21
C25
C26
C27
C28
C29
C30
15p
15p
15p
15p
10n
10n
2.2n
2.2n
2.2n
2.2n
10n
1µ
R4
3KV 3216
R5
3KV 3216
R6
3KV 3216
R8
50V 1608 K
50V 1608 K
50V 1608 Z
50V 1608 Z
50V 1608 Z
50V 1608 Z
50V 1608 Z
50V 2012 K
16V 1608 K
50V 2012 K
50V 1608 Z
50V 1608 K
50V 1608 K
R9
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
1K
1K
100K
10K
1K
1K
0.1µ
1µ
1K
1K
10n
10n
10n
10K
10K
10K
10K
10K
10K
1K
Diode / TR (SMD)
BAW56
D1
D3
Fairchildsemi
Fairchildsemi
Fairchildsemi
Fairchildsemi
Fairchildsemi
Fairchildsemi
Fairchildsemi
Fairchildsemi
Fairchildsemi
Fairchildsemi
BAV70
D4
BAV70
D6
BAV99
10K
Capacitor (SMD)
0.22µ
1µ
D7
BAV99
D8
BAV99
C1
C2
C3
C4
16V 1608 K
50V 2012 K
50V 1608 K
50V 1608 K
D9
BAV99
D10
D11
Q1
BAW56
4.7n
4.7n
BAW56
KST2222
11
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FAN7314 Rev. 1.0.1
5. BOM of the Application Circuit (Continued)
Part Ref.
Value
Description/Vendor
Part Ref.
Value
Description/Vendor
Electrolytic capacitor
220µ
Wafer (SMD)
C22
25V
CN1
CN2
CN3
CN4
CN5
35001WR-02A
35001WR-02A
35001WR-02A
35001WR-02A
12505WR-10
MOSFET (SMD)
M1
M2
FDS8958A
FDS8958A
Fairchildsemi
Fairchildsemi
Transformer (SMD)
TX1
TX2
EFD2124
EFD2124
Supported by Namyang electronics
(http://www.namyangelec.co.kr)
12
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FAN7314 Rev. 1.0.1
Mechanical Dimensions
20-pin SOIC Package
Inches
Millimeters
Symbol
Notes
Min.
Max.
Min.
Max.
A
.093
.004
.013
.009
.496
.291
.104
.012
.020
.013
.512
.299
2.35
0.10
0.33
0.23
12.60
7.40
2.65
0.30
0.51
0.32
13.00
7.60
A1
B
C
D
E
5
2
2
e
.050 BSC
1.27 BSC
H
h
.394
.010
.016
.419
.029
.050
10.00
0.25
0.40
10.65
0.75
1.27
L
3
6
N
α
20
20
0°
8°
0°
8°
ccc
—
.004
—
0.10
Notes:
1. Dimensioning and tolerancing per ANSI Y14.5M-1982.
2. "D" and "E" do not include mold flash. Mold flash or
protrusions shall not exceed .010 inch (0.25mm).
3. "L" is the length of terminal for soldering to a substrate.
4. Terminal numbers are shown for reference only.
5. "C" dimension does not include solder finish thickness.
6. Symbol "N" is the maximum number of terminals.
20
11
E
H
1
10
D
h x 45°
A1
A
C
SEATING
PLANE
– C –
α
e
B
LEAD COPLANARITY
ccc C
L
13
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FAN7314 Rev. 1.0.1
TRADEMARKS
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DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVESTHE RIGHTTO MAKE CHANGES WITHOUTFURTHER NOTICETOANY
PRODUCTS HEREINTO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOTASSUMEANYLIABILITY
ARISING OUTOFTHEAPPLICATION OR USE OFANYPRODUCTOR CIRCUITDESCRIBED HEREIN; NEITHER DOES IT
CONVEYANYLICENSE UNDER ITS PATENTRIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILDíS PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUTTHE EXPRESS WRITTENAPPROVALOF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, or (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in significant injury to the
user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Advance Information
Formative or
In Design
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
Preliminary
First Production
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
No Identification Needed
Obsolete
Full Production
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
Not In Production
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Rev. I18
14
www.fairchildsemi.com
FAN7314 Rev. 1.0.1
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