FAN7548GX [ROCHESTER]

LIQUID CRYSTAL DISPLAY DRIVER, PDSO20, SSOP-20;
FAN7548GX
型号: FAN7548GX
厂家: Rochester Electronics    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  
|
Careers Sitema  
Go  
TECHNICAL INFORMATION  
DESIGN CENTER  
SUPPORT  
COMPANY  
INVESTORS  
MY FA  
DATASHEETS, SAMPLES, BUY  
APPLICATIONS  
Home >> Find products >>  
Related Links  
FAN7548  
CCFL BACK LIGHT IC  
Request samples  
How to order products  
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  
back to top  
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  
back to top  
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.  
back to top  
Application notes  
AN-4136: Dual LCD Backlight Inverter Drive IC (193 K) Jul 27, 2007  
back to top  
Qualification Support  
Click on a product for detailed qualification data  
Product  
FAN7548GX  
back to top  
© 2007 Fairchild Semiconductor  
Products | Design Center | Support | Company News | Investors | My Fairchild | Contact Us | Site Index | Privacy Policy | Site Terms & Conditions | Standard Terms & Conditions o  

相关型号:

FAN7554

Versatile PWM Controller
FAIRCHILD

FAN7554

多功能 PWM 控制器
ONSEMI

FAN7554D

Versatile PWM Controller
FAIRCHILD

FAN7554DTF

Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDSO8, SOP-8
FAIRCHILD

FAN7554_03

Versatile PWM Controller
FAIRCHILD

FAN7556

Voltage Mode PWM Controller
FAIRCHILD

FAN7556M

SMPS Controller
FAIRCHILD

FAN7556MX

SMPS Controller
FAIRCHILD

FAN7563

Lithium-Ion Charger Controller
FAIRCHILD

FAN7563D

Battery Management
FAIRCHILD

FAN7563DTF

Power Supply Support Circuit, Fixed, 2 Channel, PDSO8, SOP-8
FAIRCHILD

FAN7564

Lithium-Ion Charger Controller
FAIRCHILD