P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2005
Rev. 1.1, 2006-11-16
WWW.Microsemi .COM
PanelMatch
™
LXMG1624-12-4x
12V Dual 4W CCFL Programmable Inverter Module
TM ®
DESCRIPTION
The LXMG1624-12-4x is a Dual 4W
Output Direct Drive™ CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module specifically designed for driving
LCD backlight lamps. It is ideal for
driving typical 6.4” to 10.4” TFT panels.
The modules are available with a
dimming input that permits brightness
control from either a DC voltage source or
a PWM signal or external Potentiometer.
The maximum output current is externally
programmable over a range of 5 to 6.5mA
in 0.5mA steps to allow the inverter to
properly match to a wide array of LCD
panel lamp current specifications.
LXMG1624 modules unlike the
LXMG1623 series does not provide wide
range ‘burst’ mode dimming, rather
dimming is provided by amplitude control
of the output curren t waveform, this limits
the potential dim range to typically less
than 5:1.
For applications not requiring wide
range dimming, amplitude control results
in lower ripple on the input supply and
reduced potential transient noise
generation. Many STN type panels are
particularly well suited for current
amplitude dimmi ng.
The modules convert DC voltage from
the system battery or AC adapter directly
to high frequency, high-voltage waves
required to ignite and operate CCFL
lamps.
The modules design is based on
Microsemi’s new LX1689 backlight
controller, which provides a number of
cost and performance advantages due to
the controller’s high level of integration.
Other benefits of this new topology
are 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
Analog Current Amplitude
Dimming Method
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
High Brightness Displays
Portable Instrumentation
Desktop Displays
Industrial Display Controls
BENEFITS
Compact, Low Profile Design
Programmable Output Current
Allows Inverter to Mate With a
Wide Variety of LCD Panels
specifications
Output Open Circuit Voltage
Regulation Minimizes Corona
Discharge For High Reliability
PRODUCT HIGHLIGHT
UNIVERSAL DIMMING INPUT
"PWM", VDC, OR POTENTIOMETER
SELECTABLE MAXIMUM OUTPUT CURRENT 5MA TO 6.5MA RMS
123
W
123
W
DC Voltage
Source Potentiometer PWM
Signal
PACKAGE ORDER INFO
PART NUMBER OUTPUT CONNECTOR INVERTER MATES DIRECTLY
TO PANEL CONNECTORS
LXMG1624-12-41 JST SM02(8.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-05A00 JST BHR-03VS-1
LXMG1624-12-42 JST SM02B-BHSS-1-TB(LF)(SN) or Yeon Ho 35001WR-02A00 JST BHSR-02VS-1
L
LX
XM
MG
G1
16
62
24
4-
-1
12
2-
-4
4X
X
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2005
Rev. 1.1, 2006-11-16
WWW.Microsemi .COM
PanelMatch
™
LXMG1624-12-4x
12V Dual 4W CCFL Programmable Inverter Module
TM ®
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Input Signal Voltage (VIN1).....................................................................................................................................-0.3V to 15V
Input Power ....................................................................................................................................................................... 10W
Output Voltage, no load ............................................................................................................ Internally Limited to 1500VRMS
Output Current ............................................................................................................................7.5mARMS (Internally Limited)
Output Power (each output) ............................................................................................................................................. 4.0W
Input Signal Voltage ( SLEEP Input) ...................................................................................................................... -0.3V to VIN1
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) 10.8 12 13.2
Input Supply Voltage Range (Functional)
VIN1
10.2 12 13.8
V
Output Power (each output) PO 3.5 4.0 W
Linear BRITE Control Input Voltage Range¹ VBRT_ADJ 0.65 to 0.9 2.0 V
Lamp Operating Voltage VLAMP 350 440 530 VRMS
Lamp Current (Full Brightness) IOLAMP 5 6.5 mARMS
Operating Ambient Temperature Range TA -20 70 °C
¹ The minimum VBRT ADJ voltage depends on the panel characteristics, depending on the panel it can vary from 0.65V to 0.9V
ELECTRICAL CHARACTERISTICS
The following specifications apply over the recommended operating condition and ambient temperature of 25°C except where otherwise
noted.
LXMG1624-12-4x
Parameter Symbol Test Conditions Min Typ Max
Units
` OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current (each output) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Ground, ISET2 = Ground 4.5 5 5.5 mARMS
Full Bright Lamp Current (each output) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Ground, ISET2 = Open 5.0 5.5 6.0 mARMS
Full Bright Lamp Current (each output) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Ground 5.5 6 6.5 mARMS
Full Bright Lamp Current (each output) IL(MAX) VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Open 6.0 6.5 7.0 mARMS
Output Current Lamp to Lamp
Deviation ILL%DEV VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Open 3 10 %
Min. Average Lamp Current
(each output) IL(MIN) VBRT_ADJ =0.65VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = ISET2 = Ground 2² mARMS
Lamp Start Voltage VLS -20°C < TA < 70°C, VIN1 > 10.8VDC 1250 1400 VRMS
Operating Frequency fO VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 12V 76 80 83 kHz
² The inverter is capable of a lower output current than may be recommended by the panel manufacturer. It is the user’s responsibility to set the
minimum brightness (BRITE) input at or above the panel specification for minimum current.
E
EL
LE
EC
CT
TR
RI
IC
CA
AL
LS
S
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2005
Rev. 1.1, 2006-11-16
WWW.Microsemi .COM
PanelMatch
™
LXMG1624-12-4x
12V Dual 4W CCFL Programmable Inverter Module
TM ®
ELECTRICAL CHARACTERISTICS (CONTINUED)
The following specifications apply over the recommended operating condition and ambient temperature of 25°C except where otherwise
noted.
LXMG1624-12-4x
Parameter Symbol Test Conditions Min Typ Max
Units
` BRITE INPUT
VBRT_ADJ = 0VDC -300 µADC
Input Current IBRT VBRT_ADJ = 3VDC 50 µADC
Minimum Input for Max. Lamp Current VBRT_ADJ I
O(LAMP) = Maximum Lamp Current 2.0 2.05 VDC
Minimum Input for Min. Lamp Current VBRT_ADJ I
O(LAMP) = Minimum Lamp Current 0.65* VDC
` SLEEP INPUT
RUN Mode SLEEP
V 2.0 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 = 12VDC, SLEEP < 0.8V 0.0 10 50 µADC
Run Current IIN(RUN) VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 440VRMS 530 mADC
Efficiency η VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 440VRMS 85 %
* The Inverter is capable of a lower output current than may be recommended by the panel manufacturer. It is the user’s responsibility to set the minimum brightness
(BRITE) input at or above the panel specification for minimum current. This is likely greater than the 0.65V minimum input.
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 (10.8V < VIN1 < 13.2V)
CN1-3
CN1-4 GND Power Supply Return
CN1-5 SLEEP ON/OFF Control. (0V < SLEEP < 0.8 = OFF, SLEEP >= 2.0V = ON
CN1-6 BRITE Brightness Control (0.65V 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, CN3 for LXMG1624-12-41 and -42 (JST SM02(8.0)B-BHS-1-TB(LF)(SN), Yeon Ho 20015WR-05A00 or SM02B-BHSS-
1-TB(LF)(SN), Yeon Ho 35001WR-02A00)
CN2-1
CN3-1 VHI High voltage connection to high Side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-2
CN3-2 VLO Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
E
EL
LE
EC
CT
TR
RI
IC
CA
AL
LS
S
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2005
Rev. 1.1, 2006-11-16
WWW.Microsemi .COM
PanelMatch
™
LXMG1624-12-4x
12V Dual 4W CCFL Programmable Inverter Module
TM ®
TABLE 1
OUTPUT CURRENT SETTINGS
SET1
(Pin 7) SET2
(Pin 8) Nominal Output Current
Open* Open* 6.5mA
Open* Ground 6.0mA
Ground Open* 5.5mA
Ground Ground 5.0mA
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS
LXMG1624-12-4X
115mm
4.53in.
CN1
1.0mm
0.0394in.
30mm
1.18in.
GROUNDED MOUNTING HOLE
3MM X 2 DIA. ±0.08
6MM SCREW HEAD CLEARANCE
Weight: (15g) typ.
109mm
4.29in.
26mm
1.02in. CN3
CN2
4mm
0.157in.
6mm
0.23in.
6.5mm Max
0.256in.
Warning
High Voltage
Present at high
side of transformer
and Output
Connector
PCB tolerances ± 0.5mm
22mm
0.866in.
103mm ±0.2mm
4.055in.
Dimensions are in millimeters (inches are for reference only)
SIMPLIFIED BLOCK DIAGRAM
Controller
and
Transformer
Driver
0.65 -
2V DC
LAMP
VLO
VHI
VBRITE
SET 1
High Voltage
Transformer
ISENSE
OV SENSE
SET 2
+3V
10K
10K
10K
+3V
+3V
VIN1
OC SENSE
One of Two
P
PA
AC
CK
KA
AG
GE
E
D
DA
AT
TA
A
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright © 2005
Rev. 1.1, 2006-11-16
WWW.Microsemi .COM
PanelMatch
™
LXMG1624-12-4x
12V Dual 4W CCFL Programmable Inverter Module
TM ®
TYPICAL APPLICATION
LXMG1624-12-4x
12V
SET2GND
VHI
VLO
BRITE VIN1
SLEEP
SET1
Rx*
20K
DAC or
Pot
CCFL
TUBE
NC NC
ONE OF
TWO
*Set Rx from 2.7K to 3.9K depending on panel
minimum lamp current requirements
Figure 1 – Brightness Control
(Output current set to maximum)
P.W.
10us to 125uS
BRITE
LXMG1624-12-4x
26% > P.W. < 100% of
period
PWM Signal
from System
Figure 1A – PWM Brightness Control
LXMG1624-12-4x
SET2GND
VHI
VLO
SLEEP
SET1
CCFL
TUBE
BRITE
12V
VIN1
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 – Maximum 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 2.7K to 3.9K 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 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 users
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 for several
seconds. After about 2 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
A
AP
PP
PL
LI
IC
CA
AT
TI
IO
ON
NS
S
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
Copyright © 2005
Rev. 1.1, 2006-11-16
WWW.Microsemi .COM
PanelMatch
™
LXMG1624-12-4x
12V Dual 4W 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.
N
NO
OT
TE
ES
S
