PRODUCTION DATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2005
Rev. 1.0, 2007-01-04
WWW.Microsemi .COM
PanelMatch
™
LXMG1626-05-67
5V 10W Dual CCFL Programmable Inverter Module
TM ®
DESCRIPTION
The LXMG1626-05-67 is a 10W dual
Output Direct Drive™ CCFL (Cold Cathode
Fluorescent Lamp) Inverter Module
specifically designed to be compatible with a
variety of LCD panels that have both lamps
on one side of the panel and use a single
common lamp return wire.
LXMG1626 modules provide the
designer with a vastly superior display
brightness range. This brightness range is
achievable with virtually any LCD display.
The modules are available with a
dimming input that permits brightness
control from either: a DC voltage source,
a PWM signal, or external Potentiometer.
The maximum output current is
externally programmable (through the input
connector) over a range of 10 to 14mA in
steps. This allows the inverter to match the
panel’s lamp current specifications or it can
be used to purposely drive the lamps at a
lower or higher current to decrease or
increase nominal brightness.
RangeMAX™ Digital Dimming Technique
provides flicker-free b rightness contro l in any
wide range (typically 100:1+) dimming
application.
The resultant “burst drive” that
energizes the lamp is designed specifically
to ensure that no premature lamp
degradation occurs, while allowing
significant power savings at lower dim
levels.
The modules convert DC voltage from
the system battery or AC adap ter directly to
high frequency, high-voltage waves
required to ignite and operate CCFL lamps.
The modules design utilizes
Microsemi’s LX1691B backlight con-
troller, which provides a number of cost and
performance advantages due to the
controller’s high level of integration. A
12V input supply version (LXMG1626-12-
67) is also available.
Other benefits of this new 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
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
Dual Lamp LCD’s Requiring a
Shared Common Lamp Return
Mates to a Single JST BHR-
04VS-1 Lamp Connector
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
PRODUCT HIGHLIGHT
HI
HI
UNIVERSAL DIMMING INPUT
"PWM ", VDC, OR POTENTIOMETER
Lamp Current 10 to 14mA in Steps
DC Voltage
Source Potentiometer PWM
Signal
INPUT
Microsemi
123
W
4
PACKAGE ORDER INFO
PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
LXMG1626-05-67 JST SM04(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00 JST BHR-04VS-1
L
LX
XM
MG
G1
16
62
26
6-
-0
05
5-
-6
67
7
PRODUCTION DATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2005
Rev. 1.0, 2007-01-04
WWW.Microsemi .COM
PanelMatch
™
LXMG1626-05-67
5V 10W Dual CCFL Programmable Inverter Module
TM ®
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Input Signal Voltage (VIN1)....................................................................................................................................-0.3V to 6.5V
Input Power ....................................................................................................................................................................... 14W
Output Voltage, no load ............................................................................................................ Internally Limited to 1800VRMS
Output Current ............................................................................................................................7.5mARMS (Internally Limited)
Output Power ................................................................................................................................................................... 10W
Input Signal Voltage ( SLEEP Input)....................................................................................................................-0.3V to 5.5V
Input Signal Voltage (BRITE) ...............................................................................................................................-0.3V to 5.5V
Ambient Operating Temperature, zero airflow.....................................................................................................-20°C to 70°C
Operating Relative Humidity, non-condensing ................................................................................................................ ≤90%
Storage Temperature Range...............................................................................................................................-40°C to 85°C
Note 1: 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, will not function optimally.
Recommended Operating Conditions
Parameter Symbol
Min R.C. Max Units
Input Supply Voltage Range (Fully Regulated
Lamp Current) 4.75 5 5.25
Input Supply Voltage Range (Functional)
VIN1
4.5 5 5.5
V
Output Power PO 8 9 W
Linear BRITE Control Input Voltage Range VBRT_ADJ 0 2.0 V
Lamp Operating Voltage VLAMP 460 540 620* VRMS
Lamp Current (Full Brightness) IOLAMP 10 14 mARMS
Operating Ambient Temperature Range TA -20 70 °C
* At higher lamp voltages the maximum lamp current is limited to about 12mA @ VIN1 = 4.75V, lamp voltage is based on single lamp measurements
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25°C except where otherwise noted.
LXMG1626-05-67
Parameter Symbol Test Conditions Min Typ Max
Units
` OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current (two lamps) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Ground, ISET2 = Ground 8.8 10 11 mARMS
Full Bright Lamp Current (two lamps) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Ground, ISET2 = Open 10.3 11.5 12.5 mARMS
Full Bright Lamp Current ((two lamps) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Open, ISET2 = Ground 11.3 12.8 13.8 mARMS
Full Bright Lamp Current ((two lamps) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Open, ISET2 = Open 12.3 14 15 mARMS
Output Current Lamp to Lamp
Deviation ILL%DEV VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Open, ISET2 = Open 5 %
Min. Average Lamp Current
(each output) IL(MIN) VBRT_ADJ = 0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = ISET2 = GND; IMIN = IMAX * √ of % Duty Cycle 1.4 mARMS
Lamp Start Voltage VLS -20°C < TA < 70°C, VIN1 > 4.5VDC 1350 1500 VRMS
Operating Frequency fO VBRT_ADJ = 2.0VDC, SLEEP > 2.0V, VIN1 = 5V 62 65 68 kHz
Burst Frequency fBURST Output Burst Frequency 242 254 266 Hz
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PRODUCTION DATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2005
Rev. 1.0, 2007-01-04
WWW.Microsemi .COM
PanelMatch
™
LXMG1626-05-67
5V 10W Dual CCFL Programmable Inverter Module
TM ®
ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25°C except where otherwise noted.
LXMG1626-05-67
Parameter Symbol Test Conditions Min Typ Max
Units
` BRITE INPUT
VBRT_ADJ = 0VDC -13.2 µADC
Input Current IBRT VBRT_ADJ = 3VDC 1 µADC
Minimum Input for Max. Lamp Current VBRT_ADJ I
O(LAMP) = Maximum Lamp Current 2.0 2.05 VDC
Maximum Input for Min. Lamp Current VBRT_ADJ I
O(LAMP) = Minimum Lamp Current 0 VDC
` SLEEP INPUT
RUN Mode SLEEP
V 2.1 VIN1 V
DC
SLEEP Mode SLEEP
V -0.3 0.8 VDC
` SET1,2 INPUT
SET1,2 Low Threshold V
L 0.4 V
Input Current ISET V
SET ≤ 0.4V -300 µA
` POWER CHARACTERISTICS
Sleep Current IIN(MIN) VIN1 = 5VDC, SLEEP < 0.8V 0.0 10 50 µADC
Run Current IIN(RUN) VIN1 = 5VDC, SLEEP ≥ 2.0V, ISET1 = Ground
ISET2 = Open, VLAMP = 520VRMS 1490 mADC
Efficiency η VIN1 = 5VDC, SLEEP ≥ 2.0V, ISET1 = Ground
ISET2 = Open, VLAMP = 520VRMS 80 %
FUNCTIONAL PIN DESCRIPTION
CONN PIN DESCRIPTION
CN1 (Molex 53261-0871) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501G input cable assembly
CN1-1
CN1-2 VIN1 Main Input Power Supply (4.75V < VIN1 < 5.25V)
CN1-3
CN1-4 GND Power Supply Return
CN1-5 SLEEP ON/OFF Control. (0V < SLEEP < 0.8 = OFF, SLEEP >= 2.1V = ON
CN1-6 BRITE Brightness Control (0V to 2.0VDC). 2.0VDC gives maximum lamp current.
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 for LXMG1626-05-67 (JST SM04(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00 )
CN2-1 VHI1 High voltage connection to high Side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-2 VHI2 High voltage connection to high Side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-3 NC No Connect
CN2-4 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
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PRODUCTION DATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2005
Rev. 1.0, 2007-01-04
WWW.Microsemi .COM
PanelMatch
™
LXMG1626-05-67
5V 10W Dual CCFL Programmable Inverter Module
TM ®
TABLE 1
OUTPUT CURRENT SETTINGS
SET1
(Pin 7) SET2
(Pin 8) Nominal Output Current
Open* Open* 14.0mA
Open* Ground 12.8mA
Ground Open* 11.5mA
Ground Ground 10.0mA
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS
LXMG1626-05-67
CN1
16mm
0.630in.
4.0mm
0.157in.
119mm
4.69in.
25mm
0.984in.
133mm
5.24in.
1.0mm
0.0394in.
7.5mm
0.295in.
Max weight: 18g
21mm
0.827in.
PCB tolerances ± 0.5mm , 4-40 recommended mounting screws
UNPLATED MOUNTING HOLE 3MM ±.08 DIA.
6MM HEAD CLEARANCE BOTH HOLES
GROUNDED MOUNTING HOLE
3MM ±.08 DIA.
CN2
Dimensions are in millimeters, inches for reference only.
SIMPLIFIED BLOCK DIAGRAM
Ramp
Gen
Transformer
Driver
0 - 2VDC
+
-
LAMP
VLO
VHI1
Comparator
Ramp
VBRITE
SET1
High Voltage
Transformer
ISENSE
OVSENSE
SET2
+3V
215K
10K
+3V
+3V
VIN1
OCSENSE
10K
Controller
One of two
LAMP
VHI2
9.09K
P
PA
AC
CK
KA
AG
GE
E
D
DA
AT
TA
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PRODUCTION DATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright © 2005
Rev. 1.0, 2007-01-04
WWW.Microsemi .COM
PanelMatch
™
LXMG1626-05-67
5V 10W Dual CCFL Programmable Inverter Module
TM ®
TYPICAL APPLICATION
LXMG1626-05-67
5V
SET2GND
VHI2
VLO
BRITE VIN1
SLEEP
SET1
500K
DAC or
Pot
NC NC
VHI1
Figure 1 – Brightness Control
(Output current set to maximum)
P.W.
5µs to 100µS
BRITE
LXMG1626-05-67
0 < P.W. < 100% of period
PWM Signal
from System
Figure 1A – PWM Brightness Control
LXMG1626-05-67
SET2GND
VHI2
VLO
SLEEP
SET1
BRITE
5V
VIN1 VHI1
L L 10.0mARMS
L H 11.5mARMS
H L 12.8mARMS
H H 14.0mARMS
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 SLEE
P
input.
Connect VHI1 and VHI2 to high voltage wires from the
lamps. Connect VLO to the low voltage wire lamp return
(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. 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 both
outputs are open (lamps disconnected or broken) or shorted
to ground the inverter will attempt to strike the lamp for a
number of cycles. After about one to two seconds 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
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PRODUCTION DATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
Copyright © 2005
Rev. 1.0, 2007-01-04
WWW.Microsemi .COM
PanelMatch
™
LXMG1626-05-67
5V 10W Dual 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 produc t at any time.
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