PanelMatch™ StayLit™
TM
®
LXMG1626-05-45
5V Dual 6W CCFL Programmable Inverter Module
P
RODUCTION
D
ATASHEET
DESCRIPTION
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
StayLit™ Continued Operation
with Single Open Lamp Failure
Fixed Frequency Operation
Fault Output Signal
Rated From -30°C to 80°C
RoHS Compliant
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Microsemi
.C
OM
The LXMG1626-05-45 is a Dual 6W
Output Direct Drive™ CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module specifically designed to be
compatible with 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) at either 10mA or 12mA
(5mA or 6mA per lamp). 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. The inverter also has
a dedicated FAULT pin that indicates an
open/shorted lamp condition.
In addition when only one of the two
lamps in the LCD fails open, the second
lamp will continue to operate with a
FAULT signal toggling to indicate the
failed condition, StayLit™feature.
RangeMAX
Digital
Dimming
Technique
provides
flicker-free
brightness control 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 design utilizes Microsemi’s
highly integrated LX1691B backlight
controller to convert DC voltage from the
system battery or AC adapter directly to
high frequency, high-voltage waves
required to ignite and operate CCFL
lamps.
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.
UL60950 E175910
APPLICATIONS
Dual lamp LCD’s requiring a
shared common lamp return
Mates to a single JST BHR-04
VS-1 lamp connector
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
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
INPUT
DC Voltage
Source
Potentiometer
PWM
Signal
LXMG1626-05-45
LXMG1626-05-45
Microsemi
HI
Lamp
Fault
Signal
OUTPUT
"PWM", V
DC
,
OR
P
OTENTIOMETER
Lamp current 5 or 6mA per Lamp
PACKAGE ORDER INFO
P
ART
N
UMBER
LXMG1626-05-45
Copyright
©
2007
Rev. 1.1, 2007-07-19
O
UTPUT
C
ONNECTOR
JST SM04(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00
I
NVERTER
M
ATES
D
IRECTLY
TO
P
ANEL
C
ONNECTORS
JST BHR-04VS-1
Page 1
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
HI
U
NIVERSAL
D
IMMING
I
NPUT
1
2
3
4
PanelMatch™ StayLit™
TM
®
LXMG1626-05-45
5V Dual 6W CCFL Programmable Inverter Module
P
RODUCTION
D
ATASHEET
ABSOLUTE MAXIMUM RATINGS
(NOTE 1)
Input Signal Voltage (V
IN
) ........................................................................................................................................-0.3V to 6V
Input Power ......................................................................................................................................................................... 8W
Output Voltage, no load ............................................................................................................ Internally Limited to 1500V
RMS
Output Current (per lamp) ...........................................................................................................6.6mA
RMS
(Internally Limited)
Output Power ..................................................................................................................................................................... 6W
Input Signal Voltage (
SLEEP
Input) ....................................................................................................................-0.3V to 5.5V
Input Signal Voltage (BRITE) ...............................................................................................................................-0.3V to 5.5V
Ambient Operating Temperature, zero airflow.....................................................................................................-30°C to 80°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.
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OM
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.
Parameter
Input Supply Voltage Range (Fully Regulated
Lamp Current)
Input Supply Voltage Range (Functional)
Output Power
Linear BRITE Control Input Voltage Range
Lamp Operating Voltage
Lamp Current (Full Brightness, per Lamp)
Operating Ambient Temperature Range
Symbol
V
IN
P
O
V
BRT_ADJ
V
LAMP
I
OLAMP
T
A
0
385
5.0
-30
Recommended Operating Conditions
Min
R.C.
Max
4.75
4.5
5
5
4.5
435
5.25
5.5
5.5
2.0
485
6.0
80
Units
V
W
V
V
RMS
¹
mA
RMS
²
°C
¹ Based on single lamp voltage measurement, use of lamps outside of this range may result is false triggering of the fault detection circuitry.
²At input voltages below 5V the inverter may not be able to output the full 6mA
RMS
per lamp in all configurations.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
0°C to 60°C except where otherwise noted.
Parameter
OUTPUT PIN CHARACTERISTICS
Full Bright Lamp Current (two lamps)
Full Bright Lamp Current (two lamps)
Output Current Lamp to Lamp
Deviation
Min. Average Lamp Current
Lamp Start Voltage
Operating Frequency
Burst Frequency
FAULT Output Voltage High
FAULT Output Voltage Low
I
L(MAX)
I
L(MAX)
I
LL%DEV
I
L(MIN)
V
LS
f
O
f
BURST
FAULT
VH
FAULT
VL
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN
= 5V
DC
I
SET
= Ground
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN
= 5V
DC
I
SET
= Open
V
BRT_ADJ
> 2.0V
DC
,
SLEEP
> 2.0V, V
IN
= 5V
DC
I
SET
= Open
V
BRT_ADJ
= 0V
DC
,
SLEEP
> 2.0V, V
IN
= 5V
DC
I
SET
= Ground; I
OUT
= I
MAX
* SQRT of % duty cycle
V
IN
> 4.5V
DC
V
BRT_ADJ
= 2.0V
DC
,
FAULT = -10uA
FAULT = 10uA
SLEEP
Symbol
Test Conditions
LXMG1626-05-45
Min
Typ
Max
9
11
10
12
5
1.6
1250
55.2
215
2.9
1400
57.6
225
3.1
0.3
0.8
60
235
11
13
Units
mA
RMS
mA
RMS
%
mA
RMS
V
RMS
kHz
Hz
V
V
E
LECTRICALS
E
LECTRICALS
> 2.0V, V
IN
= 5V
Output Burst Frequency
Copyright
©
2007
Rev. 1.1, 2007-07-19
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
PanelMatch™ StayLit™
TM
®
LXMG1626-05-45
5V Dual 6W CCFL Programmable Inverter Module
P
RODUCTION
D
ATASHEET
ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
0°C to 60°C except where otherwise noted.
Parameter
BRITE INPUT
Input Current
Minimum Input for Max. Lamp Current
Maximum Input for Min. Lamp Current
SLEEP BAR INPUT
Run Mode
Sleep Mode
SET INPUT
SET Low Threshold
Input Current
POWER CHARACTERISTICS
Sleep Current
Run Current
Efficiency
I
IN(MIN)
I
IN(RUN)
η
V
IN
= 5V
DC
,
SLEEP
< 0.8V
V
IN
= 5V
DC
,
SLEEP
≥
2.0V, I
SET
= Ground
V
LAMP
= 435V
RMS
V
IN
= 5V
DC
,
SLEEP
≥
2.0V, I
SET
= Ground
V
LAMP
= 435V
RMS
0.0
12
1090
80
50
µA
DC
mA
DC
%
V
L
I
SET
V
SET
≤
0.4V
-420
0.4
V
µA
I
BRT
V
BRT_ADJ
V
BRT_ADJ
V
BRT_ADJ
= 0V
DC
V
BRT_ADJ
= 3V
DC
I
O(LAMP)
= Maximum Lamp Current
I
O(LAMP)
= Minimum Lamp Current
0
-13
1
2.0
2.05
µA
DC
µA
DC
V
DC
V
DC
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Microsemi
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OM
Symbol
Test Conditions
LXMG1626-05-45
Min
Typ
Max
Units
V
SLEEP
V
SLEEP
2.1
-0.3
V
IN
0.8
V
DC
V
DC
FUNCTIONAL PIN DESCRIPTION
C
ONN
CN1-1
CN1-2
CN1-3
CN1-4
CN1-5
CN1-6
CN1-7
CN1-8
CN2-1
CN2-2
CN2-3
CN2-4
P
IN
D
ESCRIPTION
CN1
(Molex 53261-0871) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501G input cable assembly
V
IN
GND
Main Input Power Supply (4.75V < V
IN
< 5.25V)
Power Supply Return
ON/OFF Control. (0V <
SLEEP
< 0.8 = OFF,
SLEEP
>= 2.1V = ON
Brightness Control (0V to 2.0V
DC
). 2.0V
DC
gives maximum lamp current.
SET Connecting this pin to ground decreases the output current (see Table 1)
High Impedance Output that indicates lamp status, high indicates fault (see figure 2 on page 5)
High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT
connect to ground.
High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT
connect to ground.
No Connect
Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT
connect to ground
SLEEP
BRITE
SET
FAULT
CN2 for LXMG1626-05-45
(JST SM03(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00 )
V
HI1
V
HI2
NC
V
LO
E
LECTRICALS
E
LECTRICALS
Copyright
©
2007
Rev. 1.1, 2007-07-19
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
PanelMatch™ StayLit™
TM
®
LXMG1626-05-45
5V Dual 6W CCFL Programmable Inverter Module
P
RODUCTION
D
ATASHEET
TABLE 1
OUTPUT CURRENT SETTINGS
SET
1
(Pin 7)
Open*
Ground
Nominal Output Current
12mA
10mA
PHYSICAL DIMENSIONS
LXMG1626-05-45
113mm
4.45in.
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Microsemi
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OM
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
U
NPLATED
M
OUNTING
H
OLE
3
MM
± 0.1 DIA.
6
MM HEAD CLEARANCE BOTH HOLES
CN1
22mm
± 0.2
0.866in.
83mm ± 0.2
3.27in.
CN2
30mm
1.181in.
4.0mm
0.157in.
16mm
0.630in.
G
ROUNDED
M
OUNTING
H
OLE
3
MM
± 0.1 DIA.
1.0mm
0.0394in.
6.5mm
0.265in.
Max
weight: 15g
Warning
High Voltage is present at
high side of transformers,
their cores and the high side
of the output connector,
when mounting please
provide at least 2 mm
clearance (in all directions)
on the component side of
the board to any conductor
Outside PCB tolerances ± 0.5mm , 4-40 recommended mounting screws
All dimensions are in millimeters, inches are for reference only
SIMPLIFIED BLOCK DIAGRAM
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
Copyright
©
2007
Rev. 1.1, 2007-07-19
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
PanelMatch™ StayLit™
TM
®
LXMG1626-05-45
5V Dual 6W CCFL Programmable Inverter Module
P
RODUCTION
D
ATASHEET
TYPICAL APPLICATION
5V
DAC or
Pot
BRITE
V
IN
V
HI1
V
HI2
LXMG1626-05-45
WWW .
Microsemi
.C
OM
500K
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
SLEEP
input.
SLEEP
SET FAULT
`
NC
NC
GND
V
LO
Connect V
HI1
and V
HI2
to high voltage wires from the
lamps. Connect V
LO
to the low voltage wire lamp return
(wire with thinner insulation). Never connect V
LO
to circuit
ground as this will defeat lamp current regulation.
Use the SET input to program the desired maximum output
current. Generally the best lamp lifetime correlates with
driving the CCFL at the manufactures nominal current
setting.
Typically the SET pin is permanently wired to ground or
intentionally left open. However it can also be actively
driven, using an open collector, or open drain logic signal.
This will allow dynamic adjustment of 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 dimming ratio is a
factor of both the burst duty cycle and the peak output
current, by using this technique the effective dim ratio can
be increased greater than what the burst duty cycle alone
could provide. Conversely, the SET input could be used to
overdrive the lamp current. Of course, any possible
degradation of lamp life from such practices is the user’s
responsibility since not all lamps are designed to be under
or overdriven.
Input connector (CN1-8) FAULT signal which is normally
low will toggle high to indicate that an output fault
condition has occurred as summarized in the table to the left
figure 2. FAULT will toggle high if one or both lamps are
open or short circuited. If only one lamp opens, or its high
side shorts to ground then the other lamp should continue to
operate with the FAULT signal going high. If both lamps
open and/or both lamps are shorted the FAULT will toggle
high if it is not already high and the inverter output will
shutdown. Also if either low side connection of the lamps
is shorted to ground, or the lamps are shorted high side to
low side, FAULT will go high and the inverter will
shutdown. In order to restart the inverter after a fault it is
necessary to toggle the
SLEEP
input or cycle the V
IN
input
supply. In fault induced shutdown mode the inverter will
draw about 15mA from V
IN
supply.
Figure 1
– Brightness Control
(Output current set to maximum)
PWM Signal
from System
P.W.
10µs to 200µS
0 < P . W . < 100 % of period
BRITE
LXMG 1626 -05-45
Figure 1A
– PWM Brightness Control
5V
BRITE
V
IN
V
HI1
V
HI2
LXMG1626-05-45
SLEEP
SET
1
FAULT
GND V
LO
Lamp(s) Status
FAULT
Inverter Operation
Normal
Normal full lamp
Low
Operation
current
One Lamp
Normal @ ½ lamp
High
Open
current*
Both Lamps
High
Shutdown
Open
One Lamp High
Normal @ ½ lamp
Side Short to
High
current*
Ground
Both Lamps
High
Shutdown
High Side Short
to Ground
Figure 2
– FAULT Output Operation
* Under some conditions the second lamp will also shutdown, this is especially
true if the inverter draws an arc going open or when shorted.
A
PPLICATION
A
PPLICATION
Copyright
©
2007
Rev. 1.1, 2007-07-19
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
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