MICROSEMI LXM1624-12-41

PanelMatch™
I N T E G R A T E D
LXM1624-12-4x
12V Dual 4W CCFL Programmable Inverter Module
P R O D U C T S
P RODUCTION D ATASHEET
KEY FEATURES
DESCRIPTION
APPLICATIONS
WWW . Microsemi .C OM
ƒ Externally Programmable
Maximum Output Current
ƒ Easy to Use Brightness Control
ƒ Analog Current Amplitude
Dimming Method
ƒ Output Open/Short-Circuit
Protection and Automatic StrikeVoltage Regulation and Timeout
ƒ Fixed Frequency Operation
ƒ Rated From -20 to 70°C
ƒ UL60950 E175910
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.
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.
The LXM1624-12-4x 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.
LXM1624
modules
unlike
the
LXM1623 series does not provide wide
range ‘burst’ mode dimming, rather
dimming is provided by amplitude control
of the output current waveform, this limits
the potential dim range to typically less
than 5:1.
ƒ High Brightness Displays
ƒ Portable Instrumentation
ƒ Desktop Displays
ƒ Industrial Display Controls
BENEFITS
ƒ Compact, Low Profile Design
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
PRODUCT HIGHLIGHT
U
N IV E R S A L
"P W M ", V
DC Voltage
Source
DC
,
D
IN P U T
IM M IN G
OR
P
O T E N T IO M E T E R
Potentiom eter
PW M
Signal
W
3
1
2
2
1
3
ELECTABLE
M
A X IM U M
TO
O
UTPUT
6 .5 M A
C
URRENT
LXM1624-12-4X
S
W
5MA
RM S
PACKAGE ORDER INFO
PART NUMBER
LXM1624-12-41
LXM1624-12-42
LXM1624-12-43
Copyright © 2002
Rev. 1.0b, 2005-01-17
OUTPUT CONNECTOR
JST SM02(8.0)B-BHS-1-TB or Yeon Ho 20015WR-05A00
JST SM02B-BHSS-1-TB or Yeon Ho 35001WR-02A00
Honda QZ-19-A3MYL #02
INVERTER MATES DIRECTLY
TO PANEL CONNECTORS
JST BHR-03VS-1
JST BHSR-02VS-1
Honda QZ-19-3F01
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
PanelMatch™
I N T E G R A T E D
LXM1624-12-4x
12V Dual 4W CCFL Programmable Inverter Module
P R O D U C T S
P RODUCTION D ATASHEET
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.
WWW . Microsemi .C OM
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 output)
Linear BRITE Control Input Voltage Range¹
Lamp Operating Voltage
Lamp Current (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
3.5
13.8
4.0
2.0
530
6.5
70
0.65 to 0.9
350
5
-20
440
Units
V
W
V
VRMS
mARMS
°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
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
LXM1624-12-4x
Min
Typ
Max
Units
OUTPUT PIN CHARACTERISTICS
IL(MAX)
Full Bright Lamp Current (each output)
IL(MAX)
Full Bright Lamp Current (each output)
IL(MAX)
Full Bright Lamp Current (each output)
IL(MAX)
Output Current Lamp to Lamp
Deviation
ILL%DEV
Min. Average Lamp Current
(each output)
Lamp Start Voltage
IL(MIN)
VLS
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 =0.65VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = ISET2 = Ground
-20°C < TA < 70°C, VIN1 > 10.8VDC
4.5
5
5.5
mARMS
5.0
5.5
6.0
mARMS
5.5
6
6.5
mARMS
6.0
6.5
7.0
mARMS
3
10
%
1250
2²
mARMS
1400
VRMS
Operating Frequency
fO
76
80
83
kHz
VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 12V
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.
Copyright © 2002
Rev. 1.0b, 2005-01-17
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
ELECTRICALS
Full Bright Lamp Current (each output)
PanelMatch™
I N T E G R A T E D
P R O D U C T S
LXM1624-12-4x
12V Dual 4W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
Parameter
`
Symbol
IBRT
Minimum Input for Max. Lamp Current
Minimum Input for Min. Lamp Current
`
Units
VBRT_ADJ
VBRT_ADJ
VBRT_ADJ = 0VDC
VBRT_ADJ = 3VDC
IO(LAMP) = Maximum Lamp Current
IO(LAMP) = Minimum Lamp Current
-300
50
2.0
2.05
0.65*
µADC
µADC
VDC
VDC
SLEEP INPUT
RUN Mode
VSLEEP
2.0
VIN1
VDC
SLEEP Mode
VSLEEP
-0.3
0.8
VDC
0.4
V
µA
50
µADC
SET1,2 INPUT
SET1,2 Low Threshold
Input Current
`
LXM1624-12-4x
Min
Typ
Max
BRITE INPUT
Input Current
`
Test Conditions
WWW . Microsemi .C OM
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.
VL
ISET
VSET ≤ 0.4V
-300
POWER CHARACTERISTICS
Sleep Current
IIN(MIN)
Run Current
IIN(RUN)
Efficiency
η
VIN1 = 12VDC, SLEEP < 0.8V
0.0
VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 440VRMS
VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 440VRMS
10
530
mADC
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 53261-0890) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501 input cable assembly
CN1-1
CN1-2
CN1-3
CN1-4
VIN1
Main Input Power Supply (10.8V < VIN1 < 13.2V)
GND
Power Supply Return
CN1-5
SLEEP
CN1-6
BRITE
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)
ON/OFF Control. (0V < SLEEP < 0.8 = OFF, SLEEP >= 2.0V = ON
Brightness Control (0.65V to 2.0VDC). 2.0VDC gives maximum lamp current.
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
CN2, CN3 for LXM1624-12-43 (Honda QZ-19-A3MYL #02)
CN2-3
CN3-3
VHI
High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length.
DO NOT connect to Ground.
CN2-1
CN3-1
VLO
Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
Copyright © 2002
Rev. 1.0b, 2005-01-17
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
ELECTRICALS
CN2, CN3 for LXM1624-12-41 and -42 (JST SM02(8.0)B-BHS-1-TB | Yeon Ho 20015WR-05A00 or SM02B-BHSS-1-TB |
Yeon Ho 35001WR-02A00)
PanelMatch™
I N T E G R A T E D
LXM1624-12-4x
12V Dual 4W CCFL Programmable Inverter Module
P R O D U C T S
P RODUCTION D ATASHEET
WWW . Microsemi .C OM
TABLE 1
OUTPUT CURRENT SETTINGS
SET1
(Pin 7)
Open*
Open*
Ground
Ground
SET2
(Pin 8)
Open*
Ground
Open*
Ground
Nominal Output Current
6.5mA
6.0mA
5.5mA
5.0mA
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS
LXM1624-12-4X
115mm
4.53in.
109mm
GROUNDED MOUNTING HOLE
3MM X 2 DIA. ±0.08
4.29in.
6MM SCREW HEAD CLEARANCE
CN1
22mm
CN2
30mm
0.866in.
26mm
1.18in.
1.02in.
CN3
4mm
0.157in.
103mm ±0.2mm
6mm
4.055in.
1.0mm
0.23in.
0.0394in.
Weight: (15g) typ.
PCB tolerances ± 0.5mm
Warning
High Voltage
6.5mm Max Present at high
0.256in.
side of transformer
and Output
Connector
Dimensions are in millimeters (inches are for reference only)
SIMPLIFIED BLOCK DIAGRAM
High Voltage
Transform er
10K
V BRITE
+3V
V IN1
OC SENSE
10K
PACKAGE DATA
Controller
and
Transform er
Driver
0.65 2V DC
V HI
LAMP
+3V
SET 1
+3V
SET 2
Copyright © 2002
Rev. 1.0b, 2005-01-17
OV SENSE
10K
I SENSE
One of Two
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
V LO
Page 4
PanelMatch™
I N T E G R A T E D
P R O D U C T S
LXM1624-12-4x
12V Dual 4W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
12V
DAC or
Pot
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.
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 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
V IN1
BRITE
20K
V HI
LXM1624-12-4x
Rx*
SLEEP
SET 1
SET 2
CCFL
TUBE
GND
V LO
ONE OF
TW O
NC
NC
*Set Rx from 2.7K to 3.9K depending on panel
minimum lamp current requirements
Figure 1 – Brightness Control
(Output current set to maximum)
PW M Signal
from System
BRITE
P.W .
LXM1624-12-4x
10us to 125uS
26% > P.W. < 100% of
period
Figure 1A – PWM Brightness Control
12V
V IN1
BRITE
V HI
CCFL
TUBE
LXM1624-12-4x
SLEEP
SET 1
SET 2
GND
V LO
ONE OF
TW O
L
L
H
H
L
5.0mARMS
H
5.5mARMS
L
6.0mARMS
H
6.5mARMS
L=GND; H=Open
Figure 2 – Max Output Current
(SET1 and SET2 Inputs)
Copyright © 2002
Rev. 1.0b, 2005-01-17
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
APPLICATION
ƒ
WWW . Microsemi .C OM
TYPICAL APPLICATION
PanelMatch™
I N T E G R A T E D
P R O D U C T S
LXM1624-12-4x
12V Dual 4W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
WWW . Microsemi .C OM
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 © 2002
Rev. 1.0b, 2005-01-17
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6