LXMG1643-12-64 Datasheet PDF - Microsemi Corporation
| Part Number | LXMG1643-12-64 | |
| Description | CCFL Programmable Inverter Module | |
| Manufacturers | Microsemi Corporation | |
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PanelMatch™
LXMG1643-12-64
TM ® 12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
DESCRIPTION
The LXMG1643-12-64 is a Quad 6W The resultant “burst drive” that
Output Direct Drive™ CCFL (Cold energizes the lamp was designed
wwwC.DatahtaoSdheeet4UF.nleutorescent 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 the 15” NEC NL10276BC30-17, levels.
AOU G150XG02, or similar TFT LCD The modules convert the DC voltage
panels.
from the system battery or AC adapter
The LXMG1643 modules provide the directly to high frequency, high-voltage
designer with a vastly superior display waves required to ignite and operate
brightness range than is typical with analog CCFL lamps.
(current amplitude control) dimming.
The LXMG1643-12-64 inverter is
The inverter includes a dimming input intended for panel assemblies with two
that permits brightness control from either high and two low lamp connections, each
a DC voltage source or a PWM signal or sharing the same connector. Three other
an external potentiometer. The maximum quad lamp versions, the LXMG1643-12-
output current is externally programmable 61, LXMG1643-12-62 and the
over a range of 5 to 8mA in 1mA steps to LXMG1643-12-63, are available to match
allow the inverter to match properly to a other quad lamp panels with alternative
wide array of LCD panel lamp current output connector configurations.
specifications.
Other benefits of this new topology
The RangeMAX™ Digital Dimming are stable fixed-frequency operation,
Technique provides flicker-free brightness secondary-side strike-voltage regulation,
control in any wide range (typically 50:1+) and both open / shorted lamp protection
dimming application.
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; 6,298,234; Patents Pending
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
RoHS Compliant
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
DC Voltage
Source
Potentiometer
PWM
Signal
Universal Dimming Input
PWM, VDC, or
Potentiometer
Microsemi
PART NUMBER
RoHS Compliant
LXMG1643-12-64
PACKAGE ORDER INFO
OUTPUT CONNECTORS
Four JST SM02(8.0)B-BHS-1-TB(LF)(SN) or
Yeon Ho 20015WR-05A00 or equivalent connectors
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
JST BHR-03VS-1 or equivalent
connectors
Copyright © 2005
Rev. 1.1, 2006-11-16
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
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PanelMatch™
LXMG1643-12-64
TM ® 12V Quad 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
TYPICAL APPLICATION
DAC or
Pot
0.45V 20K
to 2.0V
1.8K
BRITE
12V
VIN1
VHx
VHx
LXMG1643-12-64
SLEEP
SET1
NC
SET2
NC
VLOx
VLOx
GND
One of two
Figure 1 – Brightness Control
(Output current set to maximum)
PWM Signal
from System
BRITE
P.W.
10µs to 125µS
LXMG1643-12-64
0 < P.W. < 100% of period
Figure 1A – PWM Brightness Control
BRITE
12V
VIN1
LXM G1643-12-64
SLEEP
SET 1 SET 2
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 an 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 © 2005
Rev. 1.1, 2006-11-16
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
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