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PDF LXMG1627-05-44 Data sheet ( Hoja de datos )
| Número de pieza | LXMG1627-05-44 | |
| Descripción | 5V Dual 4W CCFL Programmable Inverter Module | |
| Fabricantes | Microsemi Corporation | |
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PanelMatch™ RangeMAX™ LXMG1627-05-44
TM ® 5V Dual 4W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
DESCRIPTION
The LXMG1627-05-44 is a Dual 4W This allows the inverter to match the
Output Direct Drive™ CCFL (Cold panel’s lamp current specifications.
Cathode Fluorescent Lamp) Inverter The modules convert a DC voltage
Module specifically designed to be from the system battery or AC adapter
compatible with the Sharp LQ104S1DG51 directly to high frequency, high-voltage
/61 10.4”, LQ121S1DG41/61 12.1” as well waves required to ignite and operate CCFL
as the 10.4” Toshiba Matsushita lamps. A 12V input inverter version is also
LTA104D182F/183F and the Samsung available: LXMG1627-12-44.
LTM121SI-T01 12.1” or similar dual lamp The module’s design utilizes
displays that have individual lamp output Microsemi’s LX6512 backlight controller,
connectors on one side of the panel.
which provides a number of cost and
LXMG1627 modules provide the performance advantages due to the
designer with a vastly superior display controller’s high level of integration.
brightness range. The RangeMAX™ Other benefits of this new topology are
Digital Dimming Technique supplies stable fixed-frequency operation,
flicker-free brightness control for any wide secondary-side strike-voltage regulation
range (typically 50:1+) dimming and both open/shorted lamp protection with
application.
fault timeout for open lamp condition.
The included dimming input permits The new LXMG1627-xx-44 modules
brightness control from either, a DC are designed therefore as a wider
voltage source, a PWM signal or an temperature range near drop-in-
external potentiometer.
replacement for the LXMG1623-xx-44
The maximum output current is inverters, the major difference being the
externally programmable (through the input input voltage adjustment range of the
connector) over a range of 5mA to 6.5mA BRITE (dimming) pin.
in 0.5mA steps.
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 -30°C to 80°C
UL60950 E175910 Pending
RoHS Compliant
APPLICATIONS
LCD’s Requiring Both Output
Connectors on One Side of Panel
Sharp LQ104S1DG51/61 and
LQ121S1DG41/61
Samsung LTM121SI-T01
Toshiba Matsushita
LTA104D182F/183F
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
DC Voltage
Source
500k
Potentiometer
PWM
Signal
PART NUMBER
LXMG1627-05-44
SELECTABLE MAXIMUM OUTPUT CURRENT
5.0MARMS TO 6.5MARMS
PACKAGE ORDER INFO
OUTPUT CONNECTOR
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
JST SM02(8.0)B-BHS-1-TB (LF)(SN) or Yeon Ho 20015WR-05A00 or equivalent
JST BHR-03VS-1
Copyright © 2008
Rev. 1.0, 2008-12-04
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 1
1 page  
PanelMatch™ RangeMAX™ LXMG1627-05-44
TM ® 5V Dual 4W CCFL Programmable Inverter Module
PRODUCTION DATASHEET
TYPICAL APPLICATION
DAC or
Pot
0V to
2.5V 500k
BRITE
5V
VIN
LAMPHI
LXMG1627-05-44
CCFL
TUBE
SLEEP
SET1 SET2
NC NC
LAMPLO
GND
One of
Two
Figure 1 – Brightness Control
(Output current set to maximum)
PWM Signal
from System
BRITE
P.W.
LXMG1627-05-44
2.5µs to 125µS
0 < P.W. < 100% of period
Figure 1A – PWM Brightness Control
BRITE
5V
VIN
VHI
LXMG1627-05-44
SLEEP
SET1 SET2
GND
CCFL
TUBE
VLO
ONE OF
TWO
L L 5.0mARMS
L H 5.5mARMS
H L 6.0mARMS
H H 6.5mARMS
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 191k pull-up resistor in series with 43.2k
to 4.2V to bias the pot (see block diagram). A PWM logic
level signal (figure 1A) may be used up to 5V; however the
inverter will reach maximum current at less than 100% duty
cycle. This can be calculated as approximately 2.3V divided
by the logic high voltage level; with 3.3V logic level this
corresponds to about 70% duty cycle for maximum lamp
current
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 manufacturers. Generally the best lamp
lifetime correlates with driving the CCFL at the
manufacturer’s 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. 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) the inverter will
attempt to strike the lamp for about 1.3 seconds, without
success the inverter will shutdown. In order to restart the
inverter it is necessary to toggle the sleep input or cycle the
VIN input supply. If either high side lamp output is directly
connected to ground the inverter will immediately shutdown.
Copyright © 2008
Rev. 1.0, 2008-12-04
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 5
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