MICROSEMI LXMG1626-05-46

PanelMatch™ StayLit™
5V 6W Dual CCFL Programmable Inverter Module
®
TM
LXMG1626-05-46
P RODUCTION D ATASHEET
KEY FEATURES
DESCRIPTION
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.
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.
ƒ Externally Programmable
Maximum Output Current
ƒ Easy to Use Brightness Control
ƒ RangeMAX Wide Range Dimming
ƒ Output Open & Short-Circuit
Protection and Automatic StrikeVoltage Regulation and Timeout
ƒ Continued Operation with Single
Open Lamp Failure
ƒ Fixed Frequency Operation
ƒ Fault Output Signal
ƒ Rated From -30 to 80°C
ƒ RoHS Compliant
ƒ UL60950 E175910
WWW . Microsemi .C OM
The LXMG1626-05-46 is a 6W Dual
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.
ƒ
APPLICATIONS
ƒ Dual Lamp LCD’s Requiring a
Shared Common Lamp Return
ƒ Mates to a Single JST BHR04VS-1 Lamp Connector
ƒ Industrial Display Controls
BENEFITS
ƒ Smooth, Flicker Free 1%-100%
Full-Range Brightness Control
ƒ Programmable Output Current
Allows Inverter to Mate with a
Wide Variety of LCD Panel’s
Specifications
ƒ 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
DC Voltage
Source
PWM
Signal
3
2
1
W
"PWM",
HI
UNIVERSAL DIMMING INPUT
HI
Lamp
Fault
Signal
OUTPUT
Microsemi
VDC, OR POTENTIOMETER
Lamp current 5 or 6mA per Lamp
PACKAGE ORDER INFO
PART NUMBER
OUTPUT CONNECTOR
INVERTER MATES DIRECTLY
TO PANEL CONNECTORS
LXMG1626-05-46
JST SM04(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00
JST BHR-04VS-1
Copyright © 2007
Rev. 1.0, 2007-03-30
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LXMG1626-05-46
4
Potentiometer
INPUT
PRODUCT HIGHLIGHT
PanelMatch™ StayLit™
5V 6W Dual CCFL Programmable Inverter Module
®
TM
LXMG1626-05-46
P RODUCTION D ATASHEET
Input Signal Voltage (VIN )......................................................................................................................................-0.3V to 6V
Input Power ......................................................................................................................................................................... 8W
Output Voltage, no load ............................................................................................................ Internally Limited to 1500VRMS
Output Current (per lamp) ...........................................................................................................6.6mARMS (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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ABSOLUTE MAXIMUM RATINGS (NOTE 1)
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
Recommended Operating Conditions
Min
R.C.
Max
Symbol
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
VIN
PO
VBRT_ADJ
VLAMP
IOLAMP
TA
4.75
5
5.25
4.5
5
4.5
5.5
5.5
2.0
420
6.0
80
0
320
5.0
-30
370
Units
V
W
V
VRMS¹
mARMS²
°C
¹ Based on single lamp voltage measurement.
²At input voltages below 5V the inverter may not be able to output the full 6mARMS 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
`
Symbol
Test Conditions
LXMG1626-05-46
Min
Typ
Max
Units
OUTPUT PIN CHARACTERISTICS
IL(MAX)
Full Bright Lamp Current (two lamps)
IL(MAX)
Output Current Lamp to Lamp
Deviation
ILL%DEV
Min. Average Lamp Current
Lamp Start Voltage
IL(MIN)
VLS
Operating Frequency
fO
Burst Frequency
fBURST
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN = 5VDC
ISET = Ground
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN = 5VDC
ISET = Open
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN = 5VDC
ISET = Open
VBRT_ADJ = 0VDC, SLEEP > 2.0V, VIN = 5VDC
ISET = Ground; IOUT = IMAX * SQRT of % duty cycle
VIN > 4.5VDC
1250
1400
VBRT_ADJ = 2.0VDC,
55.2
57.6
60
kHz
Output Burst Frequency
215
225
235
Hz
2.9
3.1
0.8
V
FAULT Output Voltage High
FAULTVH
FAULT = -10uA
FAULT Output Voltage Low
FAULTVL
FAULT = 10uA
Copyright © 2007
Rev. 1.0, 2007-03-30
SLEEP
> 2.0V, VIN = 5V
9
10
11
mARMS
11
12
13
mARMS
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
5
%
1.6
mARMS
0.3
VRMS
V
Page 2
ELECTRICALS
Full Bright Lamp Current (two lamps)
PanelMatch™ StayLit™
5V 6W Dual CCFL Programmable Inverter Module
®
TM
LXMG1626-05-46
P RODUCTION D ATASHEET
Parameter
`
`
`
Units
VBRT_ADJ = 0VDC
VBRT_ADJ = 3VDC
-13
1
µADC
µADC
2.0
Test Conditions
BRITE INPUT
Input Current
`
LXMG1626-05-46
Min
Typ
Max
Symbol
IBRT
Minimum Input for Max. Lamp Current
VBRT_ADJ
IO(LAMP) = Maximum Lamp Current
Maximum Input for Min. Lamp Current
VBRT_ADJ
IO(LAMP) = Minimum Lamp Current
2.05
VDC
0
VDC
SLEEP INPUT
RUN Mode
VSLEEP
2.1
VIN
VDC
SLEEP Mode
VSLEEP
-0.3
0.8
VDC
0.4
V
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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.
SET INPUT
SET Low Threshold
VL
Input Current
ISET
VSET ≤ 0.4V
-420
µA
POWER CHARACTERISTICS
Sleep Current
IIN(MIN)
Run Current
IIN(RUN)
η
Efficiency
VIN = 5VDC,
SLEEP <
0.8V
0.0
VIN = 5VDC, SLEEP ≥ 2.0V, ISET = Ground
VLAMP = 370VRMS
VIN = 5VDC, SLEEP ≥ 2.0V, ISET = Ground
VLAMP = 370VRMS
12
50
µADC
870
mADC
85
%
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
CN1-3
CN1-4
VIN
Main Input Power Supply (4.75V < VIN < 5.25V)
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
SET
CN1-8
FAULT
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)
CN2-1
CN2-2
CN2-3
CN2-4
Copyright © 2007
Rev. 1.0, 2007-03-30
VHI1
High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to ground.
VHI2
High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to ground.
NC
VLO
No Connect
Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to ground
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
ELECTRICALS
CN2 for LXMG1626-05-46 (JST SM03(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00 )
PanelMatch™ StayLit™
5V 6W Dual CCFL Programmable Inverter Module
®
TM
LXMG1626-05-46
P RODUCTION D ATASHEET
WWW . Microsemi .C OM
TABLE 1
OUTPUT CURRENT SETTINGS
SET1
(Pin 7)
Open*
Ground
Nominal Output Current
12mA
10mA
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS
LXMG1626-05-46
UNPLATED MOUNTING HOLE 3MM ± 0.1 DIA.
6MM HEAD CLEARANCE BOTH HOLES
113mm
4.45in.
CN1
W
83mm ± 0.2
22mm
± 0.2
0.866in.
1.181in.
W
4.0mm
0.157in.
30mm
CN2
3.27in.
16mm
GROUNDED MOUNTING
HOLE 3MM ± 0.1 DIA.
0.630in.
1.0mm
0.0394in.
6.5mm
0.265in.
Max
weight: 15g
Outside PCB tolerances ± 0.5mm , 4-40 recommended mounting screws
SIMPLIFIED BLOCK DIAGRAM
+3V
Ramp
-
Transformer
Driver
VIN
OCSENSE
PACKAGE DATA
Ramp
Gen
+3V
VHI
LAMP
+
9.09K
VHI
LAMP
Comparator
VBRITE
0 - 2VDC
High Voltage
Transformer
Controller
215K
10K
SET
~+5V
10K
10K
OVSENSE
ISENSE
VLO
FAULT
Copyright © 2007
Rev. 1.0, 2007-03-30
One of two
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
PanelMatch™ StayLit™
®
TM
LXMG1626-05-46
5V 6W Dual CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
TYPICAL APPLICATION
VIN
BRITE
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 microcontroller may also be used as shown in Figure 1A.
ƒ
If you need to turn the inverter ON/OFF remotely, connect
to TTL logic signal to the SLEEP input.
ƒ
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.
ƒ
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.
ƒ
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 temporarily to facilitate faster
lamp warm up at initial lamp turn on. 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.
ƒ
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 VIN input
supply. In fault induced shutdown mode the inverter will
draw about 15mA from VIN supply.
VHI2
500K
LXMG1626-05-46
SLEEP
SET FAULT
`
NC
NC
GND
VLO
Figure 1 – Brightness Control
(Output current set to maximum)
PWM Signal
BRITE
from System
P.W .
LXMG 1626 -05-46
10 µs to 200 µS
0 < P . W . < 100 % of period
Figure 1A – PWM Brightness Control
5V
VHI1
VIN
BRITE
VHI2
LXMG1626-05-46
SLEEP
SET1 FAULT
GND VLO
Lamp(s) Status
FAULT
Inverter Operation
Normal Operation
Low
Normal full lamp current
Normal @ ~½ lamp
current*
Shutdown
One Lamp Open
High
Both Lamps Open
One Lamp High
Side Short to
Ground
Both Lamps High
Side Short to
Ground
High
High
Normal @ ~½ lamp
current*
High
Shutdown
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.
Copyright © 2007
Rev. 1.0, 2007-03-30
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
APPLICATION
ƒ
VHI1
WWW . Microsemi .C OM
5V
DAC or
Pot
PanelMatch™ StayLit™
TM
®
LXMG1626-05-46
5V 6W Dual CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
WWW . Microsemi .C OM
NOTES
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
Copyright © 2007
Rev. 1.0, 2007-03-30
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6