FAN7548GX [ROCHESTER]
LIQUID CRYSTAL DISPLAY DRIVER, PDSO20, SSOP-20;
| 型号： | FAN7548GX |
| 厂家： | 
Rochester Electronics |
| 描述： | LIQUID CRYSTAL DISPLAY DRIVER, PDSO20, SSOP-20 驱动 光电二极管 接口集成电路 |
| 文件： | 总15页 (文件大小：1952K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN7548
Dual LCD Back Light Inverter Drive IC
Features
Description
• Backlight Lamp Ballast and Soft Dimming
• Reduce the Number of Components
• Wide Range Operating Voltage 9-30V
• Precision Voltage Reference Trimmed to 3.4%
• Low Standby Current (Typ. 150uA)
• Soft Start Function
The FAN7548 provides the necessary circuit blocks to
implement a highly efficient CCFL backlight power supply
in a small footpirnt 20 SSOP package. The device features
two control stages for operating independent resonant tanks
for multi-lamp designs.
External parts count is minimized and system cost is reduced
by integration such features as a feedback controlled PWM
driver stage, the soft start, the open lamp regulation, the open
lamp protection, the UVLO, and the self-synchronization
circuitry between the buck and Royer stages. It includes an
internal shunt regulator, allowing it to operate with input
voltage from 9 to 30V. It supports analog and burst dimming
modes of operation. It providees the open lamp regulation,
and the open lamp protection.
• Dual PWM Control
• Analog & Burst Dimming Function
• P-Channel MOSFET Drive
• Open Lamp Regulation(OLR)
• Open Lamp Protection(OLP)
• Buck+Royer Topology
• 20 SSOP
20-SSOP
1
Rev. 1.0.0
©2003 Fairchild Semiconductor Corporation
FAN7548
Internal Block Diagram
ENA
3Vref
V3
Internal
Bias
Vz
ADIM
BDIM
Va
Vb
Vcc
+
-
UVLO
5.2V
GND
Output
Drive2
Output
Drive1
OUT2
OUT1
13.5V
13.5V
Vz
Vz
2uA
2uA
+
-
+
R
R
S
OLP2
OLP1
Q
Q
S
3.7V
2.5V
3.7V
2.5V
-
COMP6
COMP1
SBurst1
SOLR1
SBurst2
SOLR2
COMP9
COMP4
Error Amp.1
+
+
+
Error Amp.2
-
VFB1
-
VFB2
Buffer
Buffer
Css
Va
+
-
+
-
Css
Va
+
+
+
2.5V
2.5V
Css
COMP1
OSC1
COMP2
OSC2
Ramp
Sync.
Ramp
Sync.
-
-
COMP2
COMP7
+
+
1.5V
1.5V
-
-
COMP3
COMP8
OLR1
OLR2
To SOLR1
SOLR2
+
+
6V
6V
Max. 1.75V
Min. 0.25V
Vcc
COMP5
+
BCT
To SBurst1
10uA
Vb
-
CSS
Css
COMP10
-
6.5V
To SBurst2
-
(Max.+Min.) of BCt
+
+
Max. 1.75V
Min. 0.25V
2
FAN7548
Pin Assignments
16
14
13
11
19
15
20
18
12
17
FAN 7 5 4 8
1
6
2
3
4
5
9
10
7
8
Pin Definitions
No
1
Name
BDIM
BCT
Function Description
Burst Dimming Input
No
11
12
13
14
15
16
17
18
19
20
Name
OUT2
GND
Function Description
Gate Dirve Output 2
Ground
2
Timing Capacitor for Burst Dimming
Open Lamp Protection 1
Error Amp Input 1
3
OLP1
VFB1
COMP1
OLR1
OSC1
ENA
CSS
Capacitor for Soft Start
Main Oscillator 2
4
OSC2
OLR2
COMP2
VFB2
OLP2
ADIM
V3
5
Error Amp Output 1
Open Lamp Regulation 2
Error Amp Output 2
Error Amp Input 2
6
Open Lamp Regulation 1
Main Oscillator 1
7
8
ON/OFF Control Input
Power Supply
Open Lamp Protection 2
Analog Dimming Input
3V Reference Voltage
9
VCC
10
OUT1
Gate Drive Output 1
3
FAN7548
Absolute Maximum Ratings
Vcc=12V, Ta=25°C for typical values and -25°C ≤ Ta ≤ 85°C and 9V ≤Vcc ≤ 30V for min/max values,
unless otherwise specified.
Characteristics
Symbol
Value
6~30
Unit
V
Supply Voltage
V
CC
Operating Temperature Range
Storage Temperature Range
Thermal Resistance Junction-Air (Note1,2)
Power Dissipation
Topr
Tstg
-25 ~ 85
-65 ~ 150
112
°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
FAN7548
Electrical Characteristics
Vcc=12V, Ta=25°C for typical values and -25°C ≤ Ta ≤ 85°C and 9V ≤Vcc ≤ 30V for min/max values,
unless otherwise specified.
Characteristics
Symbol
Test Condition
Min.
Typ.
Max.
Unit
ON/OFF SECTION
On Stage Input Voltage
SOFT START SECTION
Soft Start Charging Current
Soft Start Clamping High Voltage
UVLO SECTION
Von
-
0.7
-
1.7
V
I
Css=4V
8.5
5.5
10
11.5
7.5
uA
V
ss
Vssh
-
-
6.5
Start Up Current
Ist
Vst
Iop
Vcc=4.5V
Vcc=12V
-
4.7
7
100
5.2
10
300
5.7
13
uA
V
Start Threshold Voltage
Operating Supply Current
REFERENCE SECTION
3V Reference Voltage
Refrence Voltage
mA
V3
-
-
2.88
2.98
2.5
3.08
V
V
Vref
2.425
2.575
ERROR AMP SECTION
Output Sink Current
lsin
lsur
COMP=3V
COMP=3V
-
-
-
-2
-
mA
mA
Output Source Current
BURST OSCILLATOR SECTION
Operating Frequency
Osc High Voltage
2
Fbosc Ct=150n
93
-
110
1.75
0.25
127
Hz
V
Vbh
Vbl
-
-
-
-
Osc Low Voltage
-
V
PROTECTION SECTION
Open Lamp Regulation Voltage
Open Lamp Protection Voltage
Open Lamp Protection Current
OUTPUT SECTION
Vor
Vpr
Ipr
-
-
-
5.5
2
6
6.5
3
V
V
2.5
2.5
-
-
uA
Output High Voltage
Voh
Vol
Voch
Vuv
Tr
Vcc=12V
Vcc=12V
10
-
-
-
V
V
Output Low Voltage
-
0.2
15.5
4
Output Clamping High Voltage
Output Voltage with UVLO Activated
Rising Time
V
CC
V
CC
V
CC
V
CC
= 15V
= 4V
11.5
13.5
-
V
2
-
V
= 12V
= 12V
150
100
200
150
ns
ns
Falling Time
Tf
-
5
FAN7548
Typical Characteristics
1.8
1.6
1.4
1.2
1.0
0.8
11.2
10.5
9.8
9.1
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 2. Soft Start Changing Current
Figure 1. On Stage Input Supply Voltage
200
160
120
80
7.14
6.72
6.30
5.88
40
0
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 4. Start Up Current
Figure 3. Soft Start Clamping High Voltage
13.0
11.7
10.4
9.1
5.6
5.4
5.2
5.0
4.8
7.8
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 6. Operating Supply Current
Figure 5. Startup Thresh Hold Voltage
6
FAN7548
Typical Characteristics (Continued)
3.08
8.5
6.8
5.1
3.4
3.04
3.00
2.96
2.92
2.88
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 8. Output Sink Current 1
Figure 7. 3V Reference Voltage
8.5
6.8
5.1
3.4
-8.5
-6.8
-5.1
-3.4
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 9. Output Source Current 1
Figure 10. Output Sink Current 2
126
-8.5
-6.8
-5.1
-3.4
119
112
105
98
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 11. Output Source Current 2
Figure 12. Operating Frequency
7
FAN7548
Typical Characteristics (Continued)
0.30
0.28
0.26
0.24
0.22
0.20
2.0
1.9
1.8
1.7
1.6
1.5
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 13. OSC High Voltage
Figure 14. OSC Low Voltage
3.0
2.8
2.6
2.4
2.2
2.0
6.46
6.27
6.08
5.89
5.70
5.51
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 16. Open Lamp Protection Voltage 1
Figure 15. Open Lamp Regulation Voltage 1
3.0
2.8
2.6
2.4
2.2
2.0
6.46
6.27
6.08
5.89
5.70
5.51
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 18. Open Lamp Regulation Voltage 2
Figure 17. Open Lamp Protection Current 1
8
FAN7548
Typical Characteristics (Continued)
3.0
3.0
2.8
2.6
2.4
2.2
2.0
2.8
2.6
2.4
2.2
2.0
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
140
140
Temparature['C]
Temparature['C]
Figure 20. Open Lamp Protection Current 2
Figure 19. Open Lamp Protection Voltage 2
0.8
12.40
11.78
11.16
10.54
0.4
0.0
-0.4
-0.8
-60
-40
-20
0
20
40
60
80
100
120
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 21. Output High Voltage 1
Figure 22. Output Low Voltage 1
4.0
3.8
3.6
3.4
3.2
3.0
15.00
14.25
13.50
12.75
12.00
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
Temparature['C]
Temparature['C]
Figure 23. Output Clamping High Voltage 1
Figure 24. Output Voltage with UVLO Activated 1
9
FAN7548
Typical Characteristics (Continued)
0.8
0.4
12.40
11.78
11.16
10.54
0.0
-0.4
-0.8
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 25. Output High Voltage 2
Figure 26. Output Low Voltage 2
4.0
3.8
3.6
3.4
3.2
3.0
15.00
14.25
13.50
12.75
12.00
-60
-40
-20
0
20
40
60
80
100
120
140
-60
-40
-20
0
20
40
60
80
100
120
140
Temparature['C]
Temparature['C]
Figure 27. Output Clamping High Voltage 2
Figure 28. Output Voltage with UVLO Activated 1
10
FAN7548
Mechanical Dimensions
Package
Dimensions in millimeters
20-SSOP
11
FAN7548
Ordering Information
Product number
Package
Operating Temperature
FAN7548G
20-SSOP
-25°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
11/4/03 0.0m 001
Stock#DSxxxxxxxx
2003 Fairchild Semiconductor Corporation
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FAN7548
CCFL BACK LIGHT IC
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Contents
•General description
•Features
•Application notes
Product Change Notices
(PCNs)
•Qualification Support
Datasheet
•Product status/pricing/packaging
•Order Samples
Download this
datasheet
Support
Sales support
Quality and reliability
Design center
General description
The FAN7548 provides the necessary circuit blocks to implement a highly
efficient CCFL backlight power supply in a small footpirnt 20 SSOP
package. The device features two control stages for operating independent
resonant tanks for multi-lamp designs.
e-mail this datasheet
This page
External parts count is minimized and system cost is reduced by integration
such features as a feedback controlled PWM driver stage, the soft start, the
open lamp regulation, the open lamp protection, the UVLO, and the self-
synchronization circuitry between the buck and Royer stages. It includes an
internal shunt regulator, allowing it to operate with input voltage from 9 to
30V. It supports analog and burst dimming modes of operation. It providees
the open lamp regulation, and the open lamp protection.
Print version
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Features
z
z
z
z
z
z
z
z
z
Backlight Lamp Ballast and Soft Dimming
Reduce the Number of Components
Wide Range Operating Voltage 9-30V
Precision Voltage Reference Trimmed to 3.4%
Low Standby Current (Typ. 150µA)
Soft Start Function
Dual PWM Control
Analog & Burst Dimming Function
z
z
z
z
z
P-Channel MOSFET Drive
Open Lamp Regulation(OLR)
Open Lamp Protection(OLP)
Buck+Royer Topology
20 SSOP
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Product status/pricing/packaging
Product
FAN7548GX
* Fairchild 1,000 piece Budgetary Pricing
Product status
Pb-free Status
Pricing*
$1.50
Package type
Leads
Packing method
Full Production
SSOP
20
TAPE REEL
** A sample button will appear if the part is available through Fairchild's on-line samples program. If there is no sample button, please
contact a Fairchild distributor to obtain samples
Indicates product with Pb-free second-level interconnect. For more information click here.
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Application notes
AN-4136: Dual LCD Backlight Inverter Drive IC (193 K) Jul 27, 2007
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Qualification Support
Click on a product for detailed qualification data
Product
FAN7548GX
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