MICROSEMI LXMG1643-12-61

PanelMatch™
®
TM
LXMG1643-12-61
12V Quad 6W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
KEY FEATURES
DESCRIPTION
The resultant “burst drive” that
energizes the lamp was 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 adapter directly
to high frequency, high-voltage waves
required to ignite and operate CCFL
lamps.
The LXMG1643-12-61 inverter is
intended for panel assemblies where lamp
pairs share close proximity with one
another. The LXMG1643-12-62 inverter
should be considered for panel
applications with individual lamp
connections or where lamps are spaced
well apart from each other.
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
ƒ Externally Programmable
Maximum Output Current
ƒ Easy to Use Brightness
Control
ƒ RangeMAX Wide Range
Dimming
ƒ Output Short-Circuit Protection
and Automatic Strike-Voltage
Regulation and Timeout
ƒ Fixed Frequency Operation
ƒ Rated From -20 to 70°C
ƒ UL 60950 E175910
ƒ RoHS Compliant
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The LXMG1643-12-61 is a Quad 6W
Output Direct Drive™ CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module specifically designed for driving
LCD backlight lamps. It is ideal for
driving typical 12.1” to 18.1” TFT panels.
LXMG1643 modules provides the
designer with a vastly superior display
brightness range then typical with analog
(amplitude control) dimming.
The inverter includes 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 10 to 16mA (per lamp pair)
in 2mA steps to allow the inverter to
properly match to a wide array of LCD
panel lamp current specifications.
RangeMAX
Digital
Dimming
Technique provides flicker-free brightness
control in any wide range typically (50:1+)
dimming application.
APPLICATIONS
ƒ High Brightness Displays
ƒ Desktop Displays
ƒ Industrial Display Controls
BENEFITS
ƒ Smooth, Flicker Free 2%100% Full-Range
Brightness Control
ƒ Programmable output
current allows inverter to
mate with a wide variety of
LCD panel’s specifications
PRODUCT HIGHLIGHT
Universal Dimming Input PWM, VDC, or Potentiometer
Potentiometer
PWM
Signal
1
4
DC
Voltage
Source
W
4
1
2
3
‘
3
Selectable Maximum Output Current 10mA to 16mARMS
PACKAGE ORDER INFO
PART NUMBER
LXMG1643-12-61
Copyright © 2005
Rev. 1.0a, 2006-11-16
OUTPUT CONNECTORS
INVERTER MATES DIRECTLY
TO PANEL CONNECTORS
Two JST SM04(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR07A00
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
JST BHR-04VS-1
Page 1
LXMG1643-12-61
2
W
PanelMatch™
®
TM
LXMG1643-12-61
12V Quad 6W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
Input Signal Voltage (VIN1).....................................................................................................................................-0.3V to 15V
Input Power ....................................................................................................................................................................... 30W
Output Voltage, no load ............................................................................................................ Internally Limited to 2000VRMS
Output Current (each output) ......................................................................................................9.5mARMS (Internally Limited)
Output Power (each output) ............................................................................................................................................. 6.0W
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.
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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
Symbol
Input Supply Voltage Range (Fully Regulated
Lamp Current)
Input Supply Voltage Range (Functional)
Output Power (each lamp)
Linear BRITE Control Input Voltage Range
Lamp Operating Voltage
Lamp Current (Each pair, Full Brightness)
Operating Ambient Temperature Range
VIN1
PO
VBRT_ADJ
VLAMP
IOLAMP
TA
Recommended Operating Conditions
Min
R.C.
Max
10.8
12
13.2
10.2
12
5.0
13.8
6.0*
2.0
720
16
70
0.5
530
10
-20
625
Units
V
W
V
VRMS
mARMS
°C
*Total output power must not exceed 12W per lamp pair. Higher voltage lamps may require the maximum output current to be set lower than 16mA.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of
25°C except where otherwise noted.
Parameter
`
Symbol
Test Conditions
LXMG1643-12-61
Min
Typ
Max
Units
OUTPUT PIN CHARACTERISTICS
IL(MAX)
Full Bright Lamp Current (two lamps)
IL(MAX)
Full Bright Lamp Current (two lamps)
IL(MAX)
Full Bright Lamp Current (two lamps)
IL(MAX)
Output Current pair of Lamps to pair of
Lamps Deviation
ILL%DEV
Min. Average Lamp Current
(two lamps)
Lamp Start Voltage
Operating Frequency
Burst Frequency
Copyright © 2005
Rev. 1.0a, 2006-11-16
IL(MIN)
VLS
fO
fBURST
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Ground, ISET2 = Ground
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Ground, ISET2 = Open
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Ground
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Open
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = Open, ISET2 = Open
VBRT_ADJ ≤0.5VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = ISET2 = Ground
-20°C < TA < 70°C, VIN1 > 10.8VDC
VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 12V
Output Burst Frequency
9
10
11
mARMS
10.8
12
13
mARMS
12.8
14
15
mARMS
14.7
16
17
mARMS
3
10
%
0.8
mARMS
1500
1650
69
72
75
kHz
269
281
293
Hz
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
VRMS
Page 2
ELECTRICALS
Full Bright Lamp Current (two lamps)
PanelMatch™
®
TM
LXMG1643-12-61
12V Quad 6W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
Parameter
`
Symbol
`
`
LXMG1643-12-61
Min
Typ
Max
Units
-300
50
µADC
µADC
BRITE INPUT
Input Current
`
Test Conditions
IBRT
VBRT_ADJ = 0VDC
VBRT_ADJ = 3VDC
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
2.0
0.4
2.05
0.5
VDC
VDC
SLEEP INPUT
RUN Mode
VSLEEP
2.0
VIN1
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.
SET1,2 INPUT
SET1,2 Low Threshold
VL
Input Current
ISET
VSET ≤ 0.4V
-300
µA
POWER CHARACTERISTICS
Sleep Current
IIN(MIN)
Run Current
IRUN
η
Efficiency
VIN1 = 12VDC, SLEEP < 0.8V
0.0
VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 625VRMS
VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 625VRMS
10
30
µADC
1750
mADC
85
%
FUNCTIONAL PIN DESCRIPTION
CONN
PIN
DESCRIPTION
CN1 (Molex 53261-1271) Mates with 51021-1200 housing, 50079-8100 pins. Mates with LX9508G input cable assembly
CN1-1,2,3
VIN1
Main Input Power Supply (10.8V < VIN1 < 13.2V)
CN1-4,5,6
GND
Power Supply Return
CN1-7
AGND
Analog Signal Ground
CN1-8
NC
CN1-9
SLEEP
CN1-10
BRITE
CN1-11
SET1
SET1 MSB Connecting this pin to ground decreases the output current (see Table 1)
CN1-12
SET2
SET2 LSB Connecting this pin to ground decreases the output current (see Table 1)
No Connect
ON/OFF Control. (0V < SLEEP < 0.8 = OFF, SLEEP >= 2.0V = ON
Brightness Control (0.5V to 2.0VDC). 2.0VDC gives maximum lamp current.
CN2,3-1
VHI1
High voltage connection to high Side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2,3-2
VHI2
High voltage connection to high Side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2,3-3
NC
Open Pin
CN2,3-4
VLO
Connection to low side of lamps. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
Copyright © 2005
Rev. 1.0a, 2006-11-16
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
ELECTRICALS
CN2 (JST SM04(4.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-07A00 )
PanelMatch™
®
TM
LXMG1643-12-61
12V Quad 6W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
WWW . Microsemi .C OM
TABLE 1
OUTPUT CURRENT SETTINGS (TWO LAMPS)
SET1
(Pin 11)
Open*
Open*
Ground
Ground
SET2
(Pin 12)
Open*
Ground
Open*
Ground
Nominal Output Current
16.0mA
14.0mA
12.0mA
10.0mA
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS
188mm
7.40in.
182mm
6mm
7.165in.
4mm
0.24in.
0.16in
W
4mm
CN1
0.16in
W
28mm ±.02mm
36mm
1.10in.
1.42in.
W
94mm
GROUNDED MOUNTING HOLES
3.18MM ±.08 DIA.
4mm
3.70in.
0.16in
88mm ± 0.2mm
SM04(4.0)B-BHS-1-TB
(JST) × 2
Warning
High Voltage Present at
high side of both
Transformers and Output
Connectors
3.465 in.
1.7mm
0.67in.
8.0mm Max
0.315in.
PCB tolerances ± 0.5mm
Weight: 44g typ.
All dimensions are in millimeters, inches are for reference only.
SIMPLIFIED BLOCK DIAGRAM
High Voltage Transformers
10K
Comparator
+
0.5 2V
V
BRITE
Ramp
DC
IN1
V
HI
Output
Driver
LAMP
V
V HI
Controller
+3V
-
Gen
10K
SET
SET
1
Z
LAMP
OC
SENSE
OV
PACKAGE DATA
Z
Ramp
+3V
SENSE
+3V
10K
2
I SENSE
V
LO
One of two
Copyright © 2005
Rev. 1.0a, 2006-11-16
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
PanelMatch™
®
TM
LXMG1643-12-61
12V Quad 6W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
12V
DAC or
Pot
0.45V
to
2.0V
BRITE
VIN1
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 1.8K 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.
ƒ
If you need to turn the inverter ON/OFF remotely, connect
to TTL logic signal to the SLEEP input.
ƒ
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.
ƒ
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.
ƒ
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.
ƒ
The inverter has a built in fault timeout function. If the
output return is open (lamp disconnected or broken) or
shorted the inverter will attempt to strike the lamp for
several seconds. After about a second 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. In the timeout shutdown mode input drain current
will be about 8mA.
V Hx
V Hx
20K
LXMG1643-12-61
1.8K
SLEEP
SET1
SET 2
GND
V LO
NC
NC
One
of
two
Figure 1 – Brightness Control
(Output current set to maximum)
PWM Signal
from System
BRITE
P.W.
LXMG1643-12-61
10µs to 125µS
0 < P.W. < 100% of period
Figure 1A – PWM Brightness Control
12V
V IN1
BRITE
LXMG1643-12-61
SLEEP
SET 1
SET
2
GND
One
of two
L
L
H
H
L
10.0mARMS
H
12.0mARMS
L
14.0mARMS
H
16.0mARMS
L=GND; H=Open
Figure 2 – Max Output Current (Two Lamps)
(SET1 and SET2 Inputs)
Copyright © 2005
Rev. 1.0a, 2006-11-16
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
APPLICATION
ƒ
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TYPICAL APPLICATION
PanelMatch™
TM
®
LXMG1643-12-61
12V Quad 6W 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 © 2005
Rev. 1.0a, 2006-11-16
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6