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PDF LXMG1626-12-64 Data sheet ( Hoja de datos )
| Número de pieza | LXMG1626-12-64 | |
| Descripción | CCFL Programmable Inverter Module | |
| Fabricantes | Microsemi Corporation | |
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PanelMatch™
LXMG1626-12-64
TM ® 12V Dual 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
DESCRIPTION
The LXMG1626-12-64 is a Dual 6W RangeMAX Digital Dimming
Output Direct Drive™ CCFL (Cold Technique provides flicker-free
wwwC.DatahtaoSdheeet4UF.nleutorescent Lamp) Inverter brightness control in any wide range
Module specifically designed to be typically (100:1+) dimming application.
compatible with the Sharp The resultant “burst drive” that
LQ150X1LGN2(A),(H), 15” or similar energizes the lamp is designed
dual lamp displays that have both specifically to ensure that no premature
individual lamp output connectors on the lamp degradation occurs, while allowing
one side of the panel.
significant power savings at lower dim
LXMG1626 modules provide the levels.
designer with a vastly superior display The modules convert DC voltage from
brightness range. This brightness range is the system battery or AC adapter directly
achievable with virtually any LCD display. to high frequency, high-voltage waves
The modules are available with a required to ignite and operate CCFL
dimming input that permits brightness lamps.
control from either, a DC voltage source, The modules design utilizes
a PWM signal or external Potentiometer. Microsemi’s LX1691 Enhanced Mult-
The maximum output current is mode CCFL backlight controller, which
externally programmable (through the provides a number of cost and
input connector) over a range of 3.5 to performance advantages due to the
5mA in 0.5mA steps. This allows the controller’s high level of integration.
inverter to match the panel’s lamp current Other benefits of this new topology
specifications, or it can be used to are stable fixed-frequency operation,
purposely drive the lamps at a lower or secondary-side strike-voltage regulation
higher current to decrease or increase and both open/shorted lamp protection
nominal brightness.
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
UNIVERSAL DIMMING INPUT
"PWM", VDC, OR POTENTIOMETER
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
RoHS Compliant
APPLICATIONS
LCD’s requiring both output
connectors on one side of panel
Sharp LQ150X1LGN2(A)(H)
Desktop Displays
Industrial Display Controls
BENEFITS
Smooth, Flicker Free 1%-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
DC Voltage
Source
Potentiometer
PWM
Signal
SELECTABLE MAXIMUM OUTPUT CURRENT 3.5MA
TO 5MA RMS
PACKAGE ORDER INFO
PART NUMBER
OUTPUT CONNECTOR
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
LXMG1626-12-64 JST SM02B-BHSS-1-TB(LF)(SN) or Yeon Ho 35001WR-02A00
JST BHSR-02VS-1
Copyright © 2005
Rev. 1.0a, 2006-11-16
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
PanelMatch™
LXMG1626-12-64
TM ® 12V Dual 6W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
TYPICAL APPLICATION
DAC or
Pot BRITE
12V
VIN1
500K
LXMG1626-12-64
VHI
CCFL
TUBE
SLEEP
SET1 SET2
NC NC
GND
VLO
ONE OF
TWO
Figure 1 – Brightness Control
(Output current set to maximum)
PWM Signal
from System
BRITE
P.W.
10µs to 20µS
LXMG1626-12-64
0 < P.W. < 100% of period
Figure 1A – PWM Brightness Control
12V
BRITE
VIN1
VHI
LXMG1626-12-64
SLEEP
SET1 SET2
GND
CCFL
TUBE
VLO
ONE OF
TWO
L L 3.5mARMS
L H 4.0mARMS
H L 4.5mARMS
H H 5.0mARMS
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 500K manual pot. The
inverter contains an internal 215K pull-up to 3V to bias the
pot. 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 user’s
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 to
ground the inverter will attempt to strike the lamp for
number of cycles. After about 800 milliseconds 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 © 2005
Rev. 1.0a, 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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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LXMG1626-12-64.PDF ] | |
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