FAN7315G [FAIRCHILD]
LCD Back Light Inverter Drive IC; LCD背光逆变器驱动IC
| 型号： | FAN7315G |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | LCD Back Light Inverter Drive IC |
| 文件： | 总8页 (文件大小：314K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN7315
LCD Back Light Inverter Drive IC
Features
Description
• Wide Dimming Range
The FAN7315 provides all the control functions for a
series parallel resonant converter and also contains 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.
Analog dimming ( 2.5 : 1 )
Burst dimming ( >100 : 1 )
• High Efficiency Single Stage Power Conversion
• Wide Input Voltage Range 7.4V to 20V
• Back Light Lamp Ballast and Soft Dimming
• Few External Components
• Precision Voltage Reference Trimmed to 2%
• ZVS full-bridge topology
• Soft Start
20-SSOP
• PWM Control at fixed frequency
• Analog, Burst Dimming Function
• Open Lamp Protection
• Open Lamp Regulation
• Short Lamp Protection
• Thermal Protection
• 20 Pin SSOP
Rev. 1.0.1
©2004 Fairchild Semiconductor Corporation
FAN7315
Internal Block Diagram
RT
OUTA
OSCILLATOR
Output
Driver
OUTB
PGND
OUTC
Output
Control
Logic
CT
-
5.2uA
S_S
+
+
Output
Driver
OUTD
EA_OUT
Thermal
protection
Error Amp.
ADIM
+
-
SET
Q
Q
R
UVLO
-
OLP
EA_IN
S
CLR
Solr
Sburst
300mV
2V
+
240uA
240uA
+
-
SCP
REF
ENA
VIN
+
OLR
2.5VREF
Voltage
Reference
&
Internal
Bias
Solr
-
2V
+
-
1.4V
BCT
BDIM
AGND
-
VIN
Sburst
+
-
+
UVLO
UVLO 7.4V
2
FAN7315
Pin Assignments
VIN
PGND OUTC OUTD
CT
SCP
OUTB
OUTA
RT
BCT
16
19
13
20
18
17
15
14
12
11
FAN7315
1
2
6
7
8
9
3
4
5
10
AGND
BDIM
OLP
OLR
ADIM
EA_OUT
REF
ENA
S_S
EA_IN
Pin Definitions
No
1
Name
OLP
Function Description
Open Lamp Protection
Open Lamp Regulation
Enable Input
No
Name
BCT
Function Description
11
12
13
14
15
16
17
18
19
20
Burst Dimming Timing Capacitor
Timing Resistor
2
OLR
RT
3
ENA
CT
Timing Capacitor
4
S/S
Soft Start
OUTD
OUTC
PGND
VIN
NMOSFET Drive Output D
PMOSFET Drive Output C
Power Ground
5
AGND
V25
Analog Ground
6
2.5V Reference Voltage
Analog Dimming Input
Burst Dimming Input
Error Amplifier Input
Error Amplifier Output
7
ADIM
BDIM
EA_IN
EA_OUT
Supply Voltage
8
OUTA
OUTB
SCP
PMOSFET Drive Output A
NMOSFET Drive Output B
Short Circuit Protection
9
10
3
FAN7315
Absolute Maximum Ratings
Vcc=12V, for typical values Ta=25°C, for min/max values Ta is the operating ambient temperature range with
-40°C ≤ Ta ≤ 85°C and 7.4V ≤ Vcc ≤ 20V, unless otherwise specified.
Characteristics
Symbol
Value
7.4 ~ 20
-40 ~ 85
-65 ~ 150
112
Unit
V
Supply Voltage
V
CC
Operating Temperature Range
Storage Temperature Range
Thermal Resistance Junction-Air (Note1,2)
Power Dissipation
Topr
Tstg
°C
°C
R
°C/W
W
θJA
Pd
1.1
Note:
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm(1S0P)
JEDEC standard: JESD51-3, JESD51-7
2. Assume no ambient airflow
4
FAN7315
Electrical Characteristics
Vcc=12V, for typical values Ta=25°C, for min/max values Ta is the operating ambient temperature range with
-40°C ≤ Ta ≤ 85°C and 7.4V ≤ Vcc ≤ 20V, unless otherwise specified.
Characteristics
Symbol
Test Condition
Min.
Typ.
Max.
Unit
REFERENCE SECTION
Load Regulation
∆V25load
0 ≤ I25 ≤ 3mA
-
-
2
2
25
25
mV
mV
V
Line Regulation
∆V25line 7.4V ≤ V
≤ 20V
CC
-
2.5V Regulation Voltage
OSCILLATOR SECTION(MAIN)
Oscillation Frequency
V25
2.44
2.49
2.54
fosc
Ta=25°C, Ct = 330pF,
93
100
107
kHz
Rt = 45k
Ct = 330pF, Rt = 45k
89
-
100
1.95
0.5
111
kHz
V
CT High Voltage
Vcth
-
-
-
-
CT Low Voltage
Vbctl
-
V
OSCILLATOR SECTION(BURST)
Oscillation Frequency
foscb
Vbcth
Vbctl
Ctb = 6.8nF, Rt=45k
150
191
2
232
Hz
V
BCT High Voltage
-
-
-
-
-
-
BCT Low Voltage
0.5
V
ERROR AMP SECTION
Error Amp Transconductance(Note1)
Output Sink Current
Gm
lsin
Va = 1~2.5V
EA_OUT = 1V
EA_OUT = 1V
OLR=2.5V
100
44
360
73
600
100
67
umho
uA
Output Source Current
lsur
33
50
uA
Open Lamp Regulation Current
EA_OUT High Volgate
Iolr
160
2.2
240
2.5
320
2.8
uA
Vea_outh
V
SOFT START SECTION
Soft Start Current
I
S_S=0V
-
3.5
2.2
5.2
6.9
2.9
uA
V
ss
Soft Start Clamping Voltage
PROTECTION SECTION
Open Lamp Protection Voltage
Open Lamp Regulation Voltage
Short Circuit Protection Voltage
Thermal Shutdown On Temp.(Note1)
TSD Hysterisis(Note1)
Vssh
2.55
Volp
Volr
-
-
-
-
-
245
1.8
1.75
130
-
300
2
425
2.2
2.25
170
-
mV
V
Vscp
2
V
TSDon
TSDhy
150
30
°C
°C
UNDER VOLTAGE LOCK OUT SECTION
Start Threshold Voltage On
UVLO Hysteresis
Vthon
Vhys
Ist
-
-
5.2
100
48
-
6.3
300
85
-
7.4
500
122
2
V
mV
uA
mA
uA
Start Up Current
V
V
V
= Vth-0.2V
= 12V
CC
CC
CC
Operating Supply Current
Stand-by Current
Iop
Isb
= 12V, ENA=0V
55
80
105
5
FAN7315
Electrical Characteristics (Continued)
Vcc=12V, for typical values Ta=25°C, for min/max values Ta is the operating ambient temperature range with
-40°C ≤ Ta ≤ 85°C and 7.4V ≤ Vcc ≤ 20V, unless otherwise specified.
Characteristics
Symbol
Test Condition
Min.
Typ.
Max. Unit
ON/OFF SECTION
Off State Input Voltage
On State Input Voltage
OUTPUT SECTION
PMOS Gate High Voltage
PMOS Gate Low Voltage
Voff
Von
-
-
-
-
-
0.7
-
V
V
2.1
Vpdhv
Vpdlv
V
V
=12V
-
Vcc
-
V
CC
=12V
Vcc- Vcc-6.5 Vcc-
CC
7.25
5.55
7.25
0.2
-
NMOS Gate High Voltage
NMOS Gate Low Voltage
Vndhv
Vndlv
Vpuv
V
CC
V
CC
V
CC
= 12V
5.55
6.5
V
V
=12V
PMOS Gate Voltage With UVLO
Activated
= Vth-0.5V
Vcc-0.2
-
-
-
NMOS Gate Voltage With UVLO
Activated
Vnuv
V
CC
= Vth-0.5V
0.2
Rising Time(Note1)
Falling Time(Note1)
Max./Min Overlap
Tr
Tf
V
V
= 12V, Cload=1700pF
= 12V, Cload=1700pF
-
-
100
100
300
300
ns
ns
CC
CC
Min. Overlap between diagonal
switches(Note1)
fosc=100KHz
fosc=100KHz
-
-
0
-
-
%
%
Max. Overlap betwwen diagonal
switches(Note1)
100
Delay Time
PDR_A/NDR_B(Note1)
PDR_C/NDR_D(Note1)
fosc=100KHz, Rt=45k
fosc=100KHz, Rt=45k
-
-
325
325
-
-
ns
ns
Note:
1. These parameters, although guaranteed, are not 100% tested in production.
6
FAN7315
Mechanical Dimensions
Package
Dimensions in millimeters
20-SSOP
7
FAN7315
Ordering Information
Product number
Package
Operating Temperature
FAN7315G
20-SSOP
-40°C ~ 85°C
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF 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, and (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 a significant injury of the
user.
2. A critical component in 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.
www.fairchildsemi.com
10/6/04 0.0m 001
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© 2002 Fairchild Semiconductor Corporation
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