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PDF LXM1623-05-6X Data sheet ( Hoja de datos )
| Número de pieza | LXM1623-05-6X | |
| Descripción | 5V Dual 6W Programmable CCFL Inverter Module | |
| Fabricantes | Microsemi | |
| Logotipo |  |
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INTEGRATED PRODUCTS
PanelMatch™
LXM1623-05-6x
www.DataSheet4U.com
5V Dual 6W Programmable CCFL Inverter Module
PRODUCTION DATASHEET
DESCRIPTION
The LXM1623-05-6x is a Dual 6W The resultant “burst drive” that
Output Direct Drive™ CCFL (Cold energizes the lamp was designed
Cathode Fluorescent Lamp) Inverter specifically to ensure that no premature
Module specifically designed for driving lamp degradation occurs, while allowing
LCD backlight lamps. It is ideal for significant power savings at lower dim
driving typical 10.4” to 15” TFT panels. levels.
LXM1623 modules provide the The modules convert DC voltage from
designer with a vastly superior display the system battery or AC adapter directly
brightness range. This brightness range is to high frequency, high-voltage waves
achievable with virtually any LCD display. required to ignite and operate CCFL
The modules are available with a lamps. A 12V input inverter is also
dimming input that permits brightness available (LXM1623-12-6x), as well as
control from either a DC voltage source or 4W versions (LXM1623-xx-4x) for
a PWM signal or external Potentiometer. driving smaller lower voltage panels.
The maximum output current is externally The modules design is based on
programmable over a range of 5 to 8mA in Microsemi’s new LX1689 backlight
1mA steps to allow the inverter to properly controller, which provides a number of
match to a wide array of LCD panel lamp cost and performance advantages due to
current specifications.
RangeMAX Digital
the controller’s high level of integration.
Dimming Other benefits of this new topology
Technique provides flicker-free brightness are stable fixed-frequency operation,
control in any wide range typically (50:1+) secondary-side strike-voltage regulation
dimming application.
and both open/shorted lamp protection
with fault timeout.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected By U.S. Patents: 5,923,129; 5,930,121; 6,198,234; Patents Pending
PRODUCT HIGHLIGHT
U NIVERSAL D IM M ING INPUT
"P W M ", V DC, OR P OTENTIOM ETER
D C V oltage
Source
Potentiom eter
PW M
S ig n a l
KEY FEATURES
Externally Programmable
Maximum Output Current
Easy to Use Brightness Control
RangeMAX Wide Range
Dimming
Output Open/Short-Circuit
Protection and Automatic Strike-
Voltage Regulation and Timeout
Fixed Frequency Operation
Rated From -20 to 70°C
UL60950 E175910
APPLICATIONS
High Brightness Displays
Portable Instrumentation
Desktop Displays
Industrial Display Controls
BENEFITS
Smooth, Flicker Free 2%-
100% Full-Range Brightness
Control
Programmable output current
allows inverter to mate with a
wide variety of LCD panel’s
specifications
Output Open Circuit Voltage
Regulation Minimizes Corona
Discharge For High Reliability
S ELECTABLE M AXIM UM O UTPUT C URRENT 5M A
TO 8MA RMS
W
PART NUMBER
LXM1623-05-61
LXM1623-05-62
LXM1623-05-63
Copyright © 2002
Rev. 1.0b, 2005-01-17
PACKAGE ORDER INFO
OUTPUT CONNECTOR
JST SM02(8.0)B-BHS-1-TB or Yeon Ho 20015WR-05A00
JST SM02B-BHSS-1-TB or Yeon Ho 35001WR-02A00
Honda QZ-19-A3MYL #02
INVERTER MATES DIRECTLY
TO PANEL CONNECTORS
JST BHR-03VS-1
JST BHSR-02VS-1
Honda QZ-19-3F01
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
INTEGRATED PRODUCTS
PanelMatch™
LXM1623-05-6x
www.DataSheet4U.com
5V Dual 6W Programmable CCFL Inverter Module
PRODUCTION DATASHEET
TYPICAL APPLICATION
DAC or
Pot
BRITE
5V
V IN 1
0.45V 20K
to 2.0V
1.8K
VHI
LXM1623-05-6x
CCFL
TUBE
SLEEP
SET1 SET2
NC NC
GND
VLO
ONE OF
TW O
Figure 1 – Brightness Control
(Output current set to maximum)
PW M Signal
from System
BRITE
P.W .
LXM1623-05-6x
10us to 125uS
0 < P.W. < 100% of period
Figure 1A – PWM Brightness Control
5V
BRITE
V IN 1
VHI
LXM1623-05-6x
SLEEP
SET1 SET2
GND
CCFL
TUBE
VLO
ONE OF
TW O
L L 5.0mARMS
L H 6.0mARMS
H L 7.0mARMS
H H 8.0mARMS
L=GND; H=Open
Figure 2 – Max Output Current
(SET1 and SET2 Inputs)
The brightness control may be a voltage output DAC or
other voltage source, a digital pot or 20K manual pot. The
inverter contains an internal 10K pull-up to 3V to bias the
pot, add a 1.8K resistor to set the lower threshold voltage.
A 3.3V Logic Level PWM signal from a micro-controller
may also be used as shown in Figure 1A.
If you need to turn the inverter ON/OFF remotely, connect
to TTL logic signal to the SLEEP input.
Connect VHI to high voltage wire from the lamp. Connect
VLO to the low voltage wire (wire with thinner insulation).
Never connect VLO to circuit ground as this will defeat
lamp current regulation. If both lamp wires have heavy
high voltage insulation, connect the longest wire to VLO.
This wire is typically white.
Use the SET1 and SET2 (see Figure 2) inputs to select the
desired maximum output current. Using these two pins in
combination allows the inverter to match a wide variety of
panels from different manufactures. Generally the best
lamp lifetime correlates with driving the CCFL at the
manufactures nominal current setting. However the SET1
and SET2 inputs allow the user the flexibility to adjust the
current to the maximum allowable output current to
increase panel brightness at the expense of some reduced
lamp life.
Although the SET pins are designed such that just leaving
them open or grounding them is all that is needed to set the
output current, they can also be actively set. Using a open
collector or open drain logic signal will allow you to
reduce the lamp current for situations where greater dim
range is required, as an example in nighttime situations. In
conjunction with a light sensor or other timer the panel
could be set to higher brightness (maximum output
current) for daytime illumination and lower brightness
(minimum or typical output current) at nighttime. Since
the dim ratio is a factor of both the burst duty cycle and the
peak output current, using this technique the effective dim
ratio can be increased greater than the burst duty cycle
alone. Conversely the SET inputs could be used to
overdrive the lamp temporarily to facilitate faster lamp
warm up at initial lamp turn on. Of course any possible
degradation on lamp life from such practices is the users
responsibility since not all lamps are designed to be
overdriven.
The inverter has a built in fault timeout function. If the
output is open (lamp disconnected or broken) or shorted
the inverter will attempt to strike the lamp for several
seconds. After about 2 to 4 seconds without success the
inverter will shutdown. In order to restart the inverter it is
necessary to toggle the sleep input or cycle the VIN1 input
supply.
Copyright © 2002
Rev. 1.0b, 2005-01-17
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LXM1623-05-6X.PDF ] | |
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