P
RODUCTION
D
ATASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2008
Rev 1.0, 2008-11-14
WWW.Microsemi .COM
PanelMatch™ VEasyLIT™ LXMG1811-05-6xS
5V 6W CCFL Programmable Inverter Module
TM ®
DESCRIPTION
The LXMG1811-05-6xS is a Single
Output 6W CCFL (Cold Cathode
Fluorescent Lamp) Inverter Module
designed for the driving LCD backlight
lamps for panels in the range of 3.9” to
15”.
Utilizing the full-bridge drive topology
capabilities of the Microsemi’s highly
integrated LX6512 CCFL backlight
controller the inverter allows a wider lamp
output voltage range 280V to 730V
compared to Microsemi’s existing Direct
Drive™ inverter solutions.
Also this ‘S’ version includes an
additional input connector which links the
inverter to a light sensor board (the
LXMG1800_LS). So connected the
inverter is capable of automatically
adjusting (VEasyLIT™) the brightness of
the LCD display to ambient lighting
conditions.
Automatic brightness control can
extend the life of the display and save
power (particularly important for battery
powered products). For applications
needing full manual control of lamp
brightness (dimming) we recommend the
LXMG1811-05-6x (non-S), which does
not offer the light sensor input.
The maximum output current of the
inverter is externally programmable over
a range of 4mA to 7mA in 1mA steps to
allow the inverter to properly match
(PanelMatch™) to a wide array of LCD
panel lamp current specifications. For
higher input voltage requirements the
LXMG1813-12-6x or -6xS will work
from a 9V to 16V input supply.
Other benefits of the inverter’s
topology include stable fixed-frequency
operation, secondary-side strike voltage
regulation 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
KEY FEATURES
Automatic Lamp Dimming Using
External LXMG1800_LS Light
Sensor Board Assembly
Externally Programmable
Maximum Output Current
Wide Lamp Voltage Range
Fixed Frequency Operation
Output Short-Circuit Protection
and Automatic Strike-Voltage
Regulation and Timeout
RangeMAX Wide Range
Dimming (50:1+)
Rated From -30°C to 80°C
UL60950 Pending
RoHS Compliant
APPLICATIONS
Medical Instrument Displays
Portable Instrumentation
Desktop Displays
Industrial Display Controls
BENEFITS
Smooth, Flicker Free Full-Range
Brightness Control
Programmable Output Current
Allows Inverter to Mate with a
Wide Variety of LCD Panel’s
Specifications
PRODUCT HIGHLIGHT
123
W
SELECTABLE MAXIMUM OUPUT
CURRENT 4MARMS TO 7MARMS
VEASYLIT™ AUTOMATIC BRIGHTNESS
INPUT USING LXMG1800_LS
AMBIENT LIGHT SENSOR ASSEMBLY
PACKAGE ORDER INFO
PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY
TO PANEL CONNECTORS
LXMG1811-05-61S JST SM02(8.0)B-BHS-1-TB(LF)(SN), Yeon Ho 20015WR-05A00 or equivalent JST BHR-03VS-1
LXMG1811-05-62S JST SM02B-BHSS-1-TB(LF)(SN), Yeon Ho 35001WR-02A00 or equivalent JST BHSR-02VS-1
L
LX
XM
MG
G1
18
81
11
1-
-0
05
5-
-6
6X
XS
S
P
RODUCTION
D
ATASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2008
Rev 1.0, 2008-11-14
WWW.Microsemi .COM
PanelMatch™ VEasyLIT™ LXMG1811-05-6xS
5V 6W CCFL Programmable Inverter Module
TM ®
ABSOLUTE MAXIMUM RATINGS
Input Signal Voltage (VIN) ........................................................................................................................................-0.3V to 6V
Input Power ......................................................................................................................................................................... 8W
Output Voltage, no load ............................................................................................................................................ 1800VRMS
Output Current ............................................................................................................................................................. 8mARMS
Output Power ...................................................................................................................................................................... 6W
Input Signal Voltage ( SLEEP Input) ...................................................................................................................... -0.3V to VIN
Input Signal Voltage (ALS_IN) .............................................................................................................................-0.3V to 5.5V
Analog Output (ALS_VCC external load current) ............................................................................................................. -5mA
Ambient Operating Temperature, zero airflow.....................................................................................................-30°C to 80°C
Storage Temperature Range...............................................................................................................................-40°C to 85°C
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified
terminal.
RECOMMENDED OPERATING CONDITIONS (R.C.)
This module has been designed to operate over a wide range of input and output conditions. However, best efficiency and performance
will be obtained if the module is operated under the condition listed in the ‘R.C.’ column. Min. and Max. columns indicate values beyond
which the inverter, although operational, may not function optimally.
Recommended Operating Conditions
Parameter Symbol
Min R.C. Max Units
Input Supply Voltage Range (Fully Regulated Lamp
Current) 4.75 5.0 5.25
Input Supply Voltage Range (Functional)
VIN
4.5 5.0 5.5
V
Output Power PO 4.2 6.0 W
Lamp Operating Voltage VLAMP 280 500 730 VRMS
Lamp Current (Full Brightness) IO(LAMP) 4.0 7.0 mARMS
Operating Ambient Temperature Range TA -30 80 °C
ELECTRICAL CHARACTERISTICS
The following specifications apply over the recommended operating condition and ambient temperature of 0°C to 60°C except where
otherwise noted; ALS_IN ≥ 2.75V, SLEEP ≥ 2.1V, VIN = 5V. LXMG1811-05-6xS
Parameter Symbol Test Conditions Min Typ Max
Units
` OUTPUT PIN CHARACTERISTICS
Full Lamp Current IL(MAX) SET1 = Ground, SET2 = Ground 3.5 4.0 4.5 mARMS
Full Lamp Current IL(MAX) SET1 = Ground, SET2 = Open 4.5 5.0 5.5 mARMS
Full Lamp Current IL(MAX) SET1 = Open, SET2 = Ground 5.4 6.0 6.6 mARMS
Full Lamp Current IL(MAX) SET1 = Open, SET2 = Open 6.3 7.0 7.7 mARMS
Full Lamp Current IL(MAX) V
IN = 4.5 to 5.5V; SET1 = Open, SET2 = Ground 5.3 6.0 6.7 mARMS
Min. Average Lamp Current IL(MIN) ALS_IN ≤ 0.9V, SET1 = SET2 = Ground, VBRT_ADJ
floating; IL(MIN) = IL* √(Min Duty Ratio) 1.0 mARMS
Lamp Start Voltage VLS -30°C < TA < 80°C, VIN ≥ 4.5V 1400 1650 VRMS
Operating Frequency fO 47.7 53 58.3 kHz
Burst Frequency fBURST Output Burst Frequency 173 206 239 Hz
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P
RODUCTION
D
ATASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2008
Rev 1.0, 2008-11-14
WWW.Microsemi .COM
PanelMatch™ VEasyLIT™ LXMG1811-05-6xS
5V 6W CCFL Programmable Inverter Module
TM ®
ELECTRICAL CHARACTERISTICS (CONTINUED)
The following specifications apply over the recommended operating condition and ambient temperature of 0°C to 60°C except where
otherwise noted; ALS_IN ≥ 2.75V, SLEEP ≥ 2.1V, VIN = 5V. LXMG1811-05-6xS
Parameter Symbol Test Conditions Min Typ Max
Units
` BRITE INPUT
Potentiometer Max Impedance Full Lamp Current 400 500 kΩ
Potentiometer Min Impedance BRTPOT Minimum Lamp Current 0 kΩ
` SLEEP BAR INPUT
RUN Mode SLEEP
V 2.1 VIN V
SLEEP Mode SLEEP
V 0 0.8 V
` SET1,2 INPUT
SET1,2 Low Threshold V
L 0 V
Input Current ISET V
SETx = 0V -400 µA
` ALS (AMBIENT LIGHT SENSOR)
ALS_VCC ALSVCC I
LOAD = 3mA 4.5 5.5 V
` POWER CHARACTERISTICS
Sleep Current IIN(MIN) SLEEP ≤ 0.8V 10 20 µA
Run Current IRUN SET1 = Open SET2 = Ground, VLAMP = 500VRMS 750 mA
Strike (Open Lamp) TS_DWELL 1.0 1.4 2.0 Sec
Supply Current under Fault condition IFAULT Fault condition 5 mA
Typical Efficiency η SET1 = Open SET2 = Ground, VLAMP = 500VRMS 75 80 %
FUNCTIONAL PIN DESCRIPTION
CONN PIN DESCRIPTION
CN1 (Molex 53261-0871 or equivalent) mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501G input cable assembly
CN1-1
CN1-2
VIN Main Input Power Supply 4.75V < VIN < 5.25V (Functional 4.5V to 5.5V)
CN1-3
CN1-4
GND Power Supply Return
CN1-5 SLEEP ON/OFF Control. (0V ≤ SLEEP ≤ 0.8V = OFF, SLEEP ≥ 2.1V = ON
CN1-6 BRITE
Can be left open or connected to a 500k potentiometer to reduce brightness when the LX1800_LS is
connected. It is not recommended as brightness control voltage input.
CN1-7 SET1 SET1 MSB Connecting this pin to ground decreases the output current (see Table 1)
CN1-8 SET2 SET2 LSB Connecting this pin to ground decreases the output current (see Table 1)
CN2 (Molex 53261-0371 or equivalent) mates with 51021-0800 housing, 50079-8100 pins. Mates with LXMG1800_LS ALS Assembly
CN2-1 ALS_VCC
Nominal 5V Supply for ALS Board Assembly. 3mA maximum output load
CN2-2 ALS_IN Brightness Control Voltage input from light sensor board.
CN2-3 ASL_GND
ALS Board Power Supply Return.
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S
P
RODUCTION
D
ATASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2008
Rev 1.0, 2008-11-14
WWW.Microsemi .COM
PanelMatch™ VEasyLIT™ LXMG1811-05-6xS
5V 6W CCFL Programmable Inverter Module
TM ®
FUNCTIONAL PIN DESCRIPTION
CONN PIN DESCRIPTION
CN3 for LXMG1811-05-61S and -62S (JST SM02(8.0)B-BHS-1-TB(LF)(SN) ; Yeon Ho 20015WR-05A00, SM02B-BHSS-1-TB(LF)(SN) ; Yeon
Ho 35001WR-02A00) or equivalent
CN3-1 VHI High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT
connect to Ground.
CN3-2 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
TABLE 1
OUTPUT CURRENT SETTINGS
SET1
(Pin 7) SET2
(Pin 8) Nominal Output Current
Open* Open* 7.0mA
Open* Ground 6.0mA
Ground Open* 5.0mA
Ground Ground 4.0mA
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS
LXMG1811-05-6xS
1.0mm ±0.1
0.0394in.
Weight: (9g) typ.
6.0mm Max
0.236in.
110mm
4.33in.
GROUNDED MOUNTING
HOLE 3.18MM ±.08 DIA.
CN2
19.5mm
0.768in.
3.5mm
0.138in.
16mm
0.63in.
93.5mm
3.68in.
12.5mm
0.492in
MOUNTING HOLE
3.18MM ±.08 DIA.
PCB tolerances ± 0.5mm , M3 recommended mounting screws
74mm ±0.2mm
2.91in
R1.0
9mm ±0.2
0.354in.
X
Warning
High Voltage is present at high
side of transformer, its core
and the high side of the output
connector, please provide at
least 3 mm clearance (in all
directions) on the component
side of the board to any
conductor when mounting
CN2
X
CN3
CN1
X
All dimensions are in millimeters, inches are for reference only
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TA
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P
RODUCTION
D
ATASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright © 2008
Rev 1.0, 2008-11-14
WWW.Microsemi .COM
PanelMatch™ VEasyLIT™ LXMG1811-05-6xS
5V 6W CCFL Programmable Inverter Module
TM ®
SIMPLIFIED BLOCK DIAGRAM
Control
Circuitry
BRITE
SET1
SET2
0.1µF
43.2k
20k
VIN
LAMP
+4.2V
2.2µF
ALS_IN
ALS_VCC
10k
10k
+4.2V
LAMP HI
SLEEP
VIN
LAMP LO
ISENSE
OVSENSE
5V
+4.2V
VeasyLIT™ LXMG1800_LS APPLICATION
Light Sensor board should
be mounted on the same
plane with LCD panel for
best results
Key LXMG1800_LS
Features
Small Size 9.5 x 31 x 2.5 mm
Flush Mount on Sensor Side
Board is Powered by Inverter
User Customizable Light Gain
Human Eye Light Response
Flexible Mounting Location
LXMG1800_LS
B
BL
LO
OC
CK
K
D
DI
IA
AG
GR
RA
AM
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P
RODUCTION
D
ATASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 6
Copyright © 2008
Rev 1.0, 2008-11-14
WWW.Microsemi .COM
PanelMatch™ VEasyLIT™ LXMG1811-05-6xS
5V 6W CCFL Programmable Inverter Module
TM ®
TYPICAL APPLICATION
LXMG1811-05-6xS
5V
SET2GND
VHI
VLO
BRITE
VIN
SLEEP
SET1
CCFL
TUBE
NC NC
500k
Figure 1 – Brightness Control
(Output current set to maximum)
LXMG1811-05-6xS
SET2GND
VHI
VLO
SLEEP
SET1
CCFL
TUBE
BRITE
5V
VIN
L L 4.0mARMS
L H 5.0mARMS
H L 6.0mARMS
H H 7.0mARMS
L=GND; H=Open
Figure 2 – Max Output Current
(SET1 and SET2 Inputs)
It is recommended to use LXMG1811-05-6xS only with
the LXMG1800_LS external light sensor assembly. A
500k potentiometer may be added to the inverter’s BRITE
input pin to allow a degree of manual override to the light
sensor. Adjustment of the potentiometer will only dim the
display further; it cannot increase the maximum brightness
level set by the light sensor. If full manual control of
dimming is required by the application we recommend the
use of the LXMG1811-05-6x (non-S) version.
If you need to turn the inverter ON/OFF remotely, connect
to TTL logic signal to the SLEE
P
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
manufacture’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. 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
the inverter will attempt to strike the lamp up to about two
seconds, after which (without success) the inverter will
shutdown. In this mode the inverter will draw about 5mA
from VIN. In order to restart the inverter it is necessary to
toggle the sleep input or cycle the VIN input supply.
A
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N
P
RODUCTION
D
ATASHEET
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 800-877-6458, 714-898-8121, Fax: 714-893-2570
Page 7
Copyright © 2008
Rev 1.0, 2008-11-14
WWW.Microsemi .COM
PanelMatch™ VEasyLIT™ LXMG1811-05-6xS
5V 6W CCFL Programmable Inverter Module
TM ®
NOTES
PRODUCTION DATA – Information contained in this document is proprietary to
Microsemi and is current as of publication date. This document may not be modified in
any way without the express written consent of Microsemi. Product processing does not
necessarily include testing of all parameters. Microsemi reserves the right to change the
configuration and performance of the product and to discontinue product at any time
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