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PDF FAN7548 Data sheet ( Hoja de datos )
| Número de pieza | FAN7548 | |
| Descripción | Dual LCD Back Light Inverter Drive IC | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FAN7548 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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www.fairchildsemi.com
FAN7548
Dual LCD Back Light Inverter Drive IC
Features
• 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
• Dual PWM Control
• Analog & Burst Dimming Function
• P-Channel MOSFET Drive
• Open Lamp Regulation(OLR)
• Open Lamp Protection(OLP)
• Buck+Royer Topology
• 20 SSOP
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.
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.
20-SSOP
1
©2003 Fairchild Semiconductor Corporation
Rev. 1.0.0
1 page  
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
ON/OFF SECTION
On Stage Input Voltage
SOFT START SECTION
Soft Start Charging Current
Soft Start Clamping High Voltage
UVLO SECTION
Start Up Current
Start Threshold Voltage
Operating Supply Current
REFERENCE SECTION
3V Reference Voltage
Refrence Voltage
ERROR AMP SECTION
Output Sink Current
Output Source Current
BURST OSCILLATOR SECTION
Operating Frequency
Osc High Voltage
Osc Low Voltage
PROTECTION SECTION
Open Lamp Regulation Voltage
Open Lamp Protection Voltage
Open Lamp Protection Current
OUTPUT SECTION
Output High Voltage
Output Low Voltage
Output Clamping High Voltage
Output Voltage with UVLO Activated
Rising Time
Falling Time
Symbol
Test Condition
Von -
Iss Css=4V
Vssh
-
Ist Vcc=4.5V
Vst -
Iop Vcc=12V
V3 -
Vref -
lsin COMP=3V
lsur COMP=3V
Fbosc
Vbh
Vbl
Ct=150n
-
-
Vor -
Vpr -
Ipr -
Voh
Vol
Voch
Vuv
Tr
Tf
Vcc=12V
Vcc=12V
VCC = 15V
VCC = 4V
VCC = 12V
VCC = 12V
Min. Typ. Max. Unit
0.7 -
1.7 V
8.5 10 11.5 uA
5.5 6.5
7.5 V
- 100 300 uA
4.7 5.2
5.7 V
7 10 13 mA
2.88
2.425
2.98
2.5
3.08
2.575
V
V
- - -2 mA
2-
- mA
93 110 127 Hz
- 1.75 - V
- 0.25 - V
5.5 6
2 2.5
- 2.5
6.5 V
3V
- uA
10 -
--
11.5 13.5
2-
- 150
- 100
-
0.2
15.5
4
200
150
V
V
V
V
ns
ns
5
5 Page 
Mechanical Dimensions
Package
20-SSOP
FAN7548
Dimensions in millimeters
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet FAN7548.PDF ] | |
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