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Copyright © 2002
Rev. 1.1a, 2005-01-17
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PanelMatch
™
LXM1618-05-4x
5V 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
DESCRIPTION
The LXM1618-05-4x is a Single
Output 4W Direct Drive™ CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module specifically designed for driving
LCD backlight lamps. It is ideal for
driving typical 8.4” to 12.1” panels.
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.
The modules are include a dimming input
that permits brightness control from either
a DC voltage source, a PWM signal or an
external potentiometer.
LXM1618 modules unlike the
LXM1617 series does not provide wide
range ‘burst’ mode dimming, rather
dimming is provided by amplitude control
of the output cu rrent wavefo rm, 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 dimming.
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. A 12V input inverter is also
available (LXM1618-12-4x).
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 and shorted lamp
protection with fault timeout.
IMPORTANT: For the most current data, co nsult 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
Output Short-Circuit
Protection and Automatic
Strike-Voltage Regulation
and Timeout
Analog Current Amplitude
Dimming Method
Fixed Frequency Operation
Rated From -20 to 70°C
UL60950 E175910
APPLICATIONS
Notebook And Sub-Notebook
Portable Instrumentation
Desktop Displays
Industrial Display Controls
BENEFITS
Compact, Low Profile Design
Mates to Wide Variety of
LCD Panels
Output Open Circuit Voltage
Regulation Minimizes
Corona Discharge For High
Reliability
PRODUCT HIGHLIGHT
UNIVERSAL D IM M IN G INPUT
"PW M ", VDC,
OR
P
OTENTIOMETER
DC Voltage
Source Potentiom eter PWM
Signal
S
ELECTABLE
M
AXIMUM
O
UPUT
C
URRENT
5
M
A
TO
6.5
M
ARMS
123
W
PACKAGE ORDER INFO
P
ART
N
UMBER
O
UTPUT
C
ONNECTOR
I
NVERTER
M
ATES
D
IRECTLY TO
P
ANEL
C
ONNECTORS
LXM1618-05-41 JST SM02(8.0)B-BHS-1-TB or Yeon Ho 20015WR-05A00 JST BHR-03VS-1
LXM1618-05-42 JST SM02B-BHSS-1-TB or Yeon Ho 35001WR-02A00 JST BHSR-02VS-1
LXM1618-05-43 Honda QZ-19-A3MYL #02 Honda QZ-19-3F01
L
LX
XM
M1
16
61
18
8-
-0
05
5
P
RODUCTI
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ATASHEET
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Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2002
Rev. 1.1a, 2005-01-17
WWW.Microsemi .COM
PanelMatch
™
LXM1618-05-4x
5V 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
ABSOLUTE MAXIMUM RATINGS
(NOTE 1)
Input Signal Voltage (V
IN1
) ................................................................................................................................... -0.3V to 6.5V
Input Power ......................................................................................................................................................................5.5W
Output Voltage, no load .............................................................................................................Internally Limited to 1600V
RMS
Output Current............................................................................................................................ 7.5mA
RMS
(Internally Limited)
Output Power....................................................................................................................................................................4.0W
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
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)
V
IN1
4.5 5 5.5
V
Output Power P
O
3.5 4.0 W
Linear BRITE Control Input Voltage Range¹ V
BRT_ADJ
0.65 to 0.9 2.0 V
Lamp Operating Voltage V
LAMP
465 550 635* V
RMS
Lamp Current (Full Brightness) I
OLAMP
5 6.5 mA
RMS
Operating Ambient Temperature Range T
A
-20 70 °C
¹ The minimum V
BRT ADJ
voltage depends on the panel characteristics, depending on the panel it can vary from 0.65V to 0.9V
² Total output power must not exceed 4W. Higher voltage lamps may require maximum output current to be set lower than 6.5mA
RMS
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25°C except where otherwise noted.
LXM1618-05-4x
Parameter Symbol Test Conditions Min Typ Max
Units
`
OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current I
L(MAX)
V
BRT_ADJ
> 2.0V
DC
, SLEEP > 2.0V, V
IN1
= 5V
DC
I
SET1
= Ground, I
SET2
= Ground 4.5 5 5.5 mA
RMS
Full Bright Lamp Current I
L(MAX)
V
BRT_ADJ
> 2.0V
DC
, SLEEP > 2.0V, V
IN1
= 5V
DC
I
SET1
= Ground, I
SET2
= Open 5.0 5.5 6.0 mA
RMS
Full Bright Lamp Current I
L(MAX)
V
BRT_ADJ
> 2.0V
DC
, SLEEP > 2.0V, V
IN1
= 5V
DC
I
SET1
= Open, I
SET2
= Ground 5.5 6 6.5 mA
RMS
Full Bright Lamp Current I
L(MAX)
V
BRT_ADJ
> 2.0V
DC
, SLEEP > 2.0V, V
IN1
= 5V
DC
I
SET1
= Open, I
SET2
= Open 6.0 6.5 7.0 mA
RMS
Min. Average Lamp Current
I
L(MIN)
V
BRT_ADJ
=0.65V
DC
, SLEEP > 2.0V, V
IN1
= 5V
DC
I
SET1
= I
SET2
= Ground 1.5 * mA
RMS
Lamp Start Voltage V
LS
-20°C < T
A
< 70°C, V
IN1
> 4.5V
DC
1300 1400 V
RMS
Operating Frequency f
O
V
BRT_ADJ
= 2.5V
DC
, SLEEP > 2.0V, V
IN1
= 5V 76 80 83 kHz
* The Inverter is capable of a lower output current than may be recommended by the panel manufacturer. It is the user responsibility to set the minimum
brightness (BRITE) input at or above the panel specification for minimum current
.
E
EL
LE
EC
CT
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RI
IC
CA
AL
LS
S
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RODUCTI
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ATASHEET
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Page 3
Copyright © 2002
Rev. 1.1a, 2005-01-17
WWW.Microsemi .COM
PanelMatch
™
LXM1618-05-4x
5V 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
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.
LXM1618-05-4x
Parameter Symbol Test Conditions Min Typ Max
Units
`
BRITE INPUT
V
BRT_ADJ
= 0V
DC
-300 µA
DC
Input Current I
BRT
V
BRT_ADJ
= 3V
DC
50 µA
DC
Minimum Input for Max. Lamp Current V
BRT_ADJ
I
O(LAMP)
= Maximum Lamp Current 2.0 2.05 V
DC
Minimum Input for Min. Lamp Current V
BRT_ADJ
I
O(LAMP)
= Minimum Lamp Current 0.65* V
DC
`
SLEEP INPUT
RUN Mode
SLEEP
V
2.0 V
IN1
V
DC
SLEEP Mode
SLEEP
V
-0.3 0.8 V
DC
`
SET
1,2
INPUT
SET
1,2
Low Threshold
V
L
0.4 V
Input Current I
SET
V
SET
≤ 0.4V -300 µA
`
POWER CHARACTERISTICS
Sleep Current I
IN(MIN)
V
IN1
= 5V
DC
, SLEEP < 0.8V 0.0 5 20 µA
DC
Run Current I
RUN
V
IN1
= 5V
DC
, SLEEP ≥ 2.0V, I
SET1
= Open
I
SET2
= Ground, V
LAMP
= 550V
RMS
830 mA
DC
Efficiency η V
IN1
= 5V
DC
, SLEEP ≥ 2.0V, I
SET1
= Open
I
SET2
= Ground, V
LAMP
= 550V
RMS
80 %
* 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
C
ONN
P
IN
D
ESCRIPTION
CN1
(Molex 53261-0890) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501 input cable assembly
CN1-1
CN1-2 V
IN1
Main Input Power Supply (4.75V < V
IN1
< 5.25V)
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 2.0V
DC
). 2.0V
DC
gives maximum lamp current.
CN1-7 SET
1
SET
1
MSB Connecting this pin to ground decreases the output current (see Table 1)
CN1-8 SET
2
SET
2
LSB Connecting this pin to ground decreases the output current (see Table 1)
CN2 for LXM1618-05-41 and -42
(JST SM02(8.0)B-BHS-1-TB / Yeon Ho 20015WR-05A00 or SM02B-BHSS-1-TB / Yeon Ho 35001WR-02A00)
CN2-1 V
HI
High voltage connection to high Side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-2 V
LO
Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
CN2 for LXM1618-05-43
(Honda QZ-19-A3MYL #02)
CN2-3 V
HI
High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-1 V
LO
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
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RODUCTI
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ATASHEET
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Rev. 1.1a, 2005-01-17
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PanelMatch
™
LXM1618-05-4x
5V 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
TABLE 1 SETTING OUTPUT CURRENT
OUTPUT CURRENT SETTINGS
SET
1
(Pin 7) SET
2
(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
LXM1618-05-4X
0.8mm
0.0315in.
Weight: (5.7g) typ
.
4.6mm Max
0.181in.
86mm
3.39in
CN1
CN2
W
11mm
0.433in.
3.5mm
0.138in.
16mm
0.63in.
71mm
2.80in
12.5mm
0.492in
X
PCB tolerances ± 0.5mm, M2 or 2-56 recommended mounting screws
Warning
High Voltage Present at
high side of transformer
and Output Connector
G
ROUNDED
M
OUNTING
H
OLE 2.44MM ±0.08
DIA
.
M
OUNTING
H
OLE
2.44MM ±0.08
DIA
.
60mm ±0.2mm
2.36in.
9mm ±2mm
0.354 in.
R1.0
All dimensions are in millimeters, inches are for reference only
SIMPLIFIED BLOCK DIAGRAM
Controller
and
Transformer
Driver
0.65 -
2V
DC
LAMP
V
LO
V
HI
V
BRITE
SET
1
High Voltage
Transformer
I
SENSE
OV
SENSE
SET
2
+3V
10K
10K
10K
+3V
+3V
V
IN1
OC
SENSE
P
PA
AC
CK
KA
AG
GE
E
D
DA
AT
TA
A
P
RODUCTI
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ATASHEET
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Copyright © 2002
Rev. 1.1a, 2005-01-17
WWW.Microsemi .COM
PanelMatch
™
LXM1618-05-4x
5V 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
TYPICAL APPLICATION
LXM1618-05-4x
5V
SET
2
GND
V
HI
V
LO
BRITE V
IN1
SLEEP
SET
1
0.65V
to 2.0V
2.7K
20K
DAC or
Pot
CCFL
TUBE
NC NC
Figure 1 – Brightness Control
(output current set to maximum)
P.W.
10µs to 125µS
BRITE
LXM1618-05-4x
~26% < P.W. < 100% o f
period
PWM Signal
from System
Figure 1A – PWM Brightness Control
LXM1618-05-4x
SET
2
GND
V
HI
V
LO
SLEEP
SET
1
CCFL
TUBE
BRITE
5V
V
IN1
L L 5.0mA
RMS
L H 5.5mA
RMS
H L 6.0mA
RMS
H H 6.5mA
RMS
L=GND; H=Open
Figure 2 – Max Output Current
(SET
1
and SET
2
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 resistor 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 V
HI
to high voltage wire from the lamp. Connect
V
LO
to the low voltage wire (wire with thinner insulation).
Never connect V
LO
to circuit ground as this will defeat
lamp current regulation. If both lamp wires have heavy
high voltage insulation, connect the longest wire to V
LO
.
This wire is typically white.
Use the SET
1
and SET
2
(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 and efficiency correlates with driving the
CCFL at the manufactures nominal current setting.
However the SET
1
and SET
2
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 the peak output current, using this
technique the effective dim ratio can be increased.
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 as 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 V
IN1
input
supply.
A
AP
PP
PL
LI
IC
CA
AT
TI
IO
ON
N
P
RODUCTI
ON
D
ATASHEET
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
Copyright © 2002
Rev. 1.1a, 2005-01-17
WWW.Microsemi .COM
PanelMatch
™
LXM1618-05-4x
5V 4W CCFL Programmable Inverter Module
INTEGRATED PRODUCTS
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 t o discontinue product at any time.
N
NO
OT
TE
ES
S
