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PDF LXM1643-12-62 Data sheet ( Hoja de datos )
| Número de pieza | LXM1643-12-62 | |
| Descripción | CCFL Programmable Inverter Module | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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PanelMatch™
LXM1643-12-62
INTEGRATED PRODUCTS
12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
DESCRIPTION
The LXM1643-12-62 is a Quad 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 12.1” to 18.1” TFT panels. levels.
LXM1643 modules provides the The modules convert DC voltage from
designer with a vastly superior display the system battery or AC adapter directly
brightness range then typical with analog to high frequency, high-voltage waves
(amplitude control) dimming.
required to ignite and operate CCFL
The inverter includes a dimming input lamps.
that permits brightness control from either The LXM1643-12-62 inverter is
a DC voltage source or a PWM signal or intended for panel assemblies with
external Potentiometer. The maximum individual lamp connections, or where
output current is externally programmable lamps are spaced apart from each other.
over a range of 5 to 8mA in 1mA steps to The LXM1643-12-61 inverter should be
allow the inverter to properly match to a used for panel applications where lamp
wide array of LCD panel lamp current pairs are in close proximity and share a
specifications.
RangeMAX
Digital
common return (low side) wire.
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
PRODUCT HIGHLIGHT
KEY FEATURES
Externally Programmable
Maximum Output Current
Easy to Use Brightness
Control
RangeMAX Wide Range
Dimming
Output Short-Circuit Protection
and Automatic Strike-Voltage
Regulation and Timeout
Fixed Frequency Operation
Rated From -20 to 70°C
UL 60950 E175910
APPLICATIONS
High Brightness Displays
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 specifications
Universal Dimming Input PWM, VDC, or Potentiometer
DC Voltage
Source
Potentiometer
PWM
Signal
"
"
Selectable Maximum Output Current 5mA to 8mARMS
PART NUMBER
LXM1643-12-62
PACKAGE ORDER INFO
OUTPUT CONNECTORS
Four JST SM02B-BHSS-1-TB
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
JST BHSR-02VS-1
Copyright 2002
Rev. 1.0, 2003-10-14
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
PanelMatch™
LXM1643-12-62
INTEGRATED PRODUCTS
12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
TYPICAL APPLICATION
DAC or
Pot
0.45V 20K
to 2.0V
1.8K
BRITE
12V
V IN 1
VHx
VHx
LXM1643-12-62
SLEEP
SET1 SET2
NC NC
GND
VLOx
VLOx
One of
two
Figure 1 – Brightness Control
(Output current set to maximum)
PW M Signal
from System
BRITE
P.W .
LXM1643-12-62
10us to 125uS
0 < P.W. < 100% of period
Figure 1A – PWM Brightness Control
BRITE
12V
V IN 1
LXM1643-12-62
SLEEP
SET1 SET2
GND
One
of two
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 return is open (lamp disconnected or broken) or
shorted the inverter will attempt to strike the lamp for
several seconds. After about a second 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. In the timeout shutdown mode input drain current
will be about 8mA.
Copyright 2002
Rev. 1.0, 2003-10-14
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LXM1643-12-62.PDF ] | |
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