MICROSEMI LXMG1618-05-42

PanelMatch™
®
TM
LXMG1618-05-4x
5V 4W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
KEY FEATURES
DESCRIPTION
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 (LXMG1618-12-4x).
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, consult MICROSEMI’s website: http://www.microsemi.com
Protected by U.S. Patents: 5,923,129; 5,930,121; 6,198,234; Patents Pending
WWW . Microsemi .C OM
The LXMG1618-05-4x 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.
LXMG1618 modules unlike the
LXMG1617 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 Externally Programmable
Maximum Output Current
ƒ Easy to Use Brightness
Control
ƒ Output Short-Circuit
Protection and Automatic
Strike-Voltage Regulation
and Timeout
ƒ Analog Current Amplitude
Dimming Method
ƒ Fixed Frequency Operation
ƒ Rated From -20 to 70°C
ƒ UL60950 E175910
ƒ RoHS Compliant
APPLICATIONS
ƒ
ƒ
ƒ
ƒ
Notebook And Sub-Notebook
Portable Instrumentation
Desktop Displays
Industrial Display Controls
BENEFITS
ƒ Compact, Low Profile Design
ƒ Mates to Wide Variety of
LCD Panels
ƒ Output Open Circuit Voltage
Regulation Minimizes
Corona Discharge For High
Reliability
PRODUCT HIGHLIGHT
UNIVERSAL DIMMING INPUT
"PWM",
Potentiometer
PWM
Signal
2
1
Microsemi
W
SELECTABLE MAXIMUM OUPUT CURRENT
5MA TO 6.5MARMS
PACKAGE ORDER INFO
PART NUMBER
OUTPUT CONNECTOR
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
LXMG1618-05-41
LXMG1618-05-42
JST SM02(8.0)B-BHS-1-TB(LF)(SN) or Yeon Ho 20015WR-05A00
JST SM02B-BHSS-1-TB(LF)(SN) or Yeon Ho 35001WR-02A00
JST BHR-03VS-1
JST BHSR-02VS-1
Copyright © 2002
Rev. 1.0a, 2006-11-13
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LXMG1618-05
3
DC Voltage
Source
VDC, OR POTENTIOMETER
PanelMatch™
®
TM
LXMG1618-05-4x
5V 4W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
Input Signal Voltage (VIN1) ................................................................................................................................... -0.3V to 6.5V
Input Power ...................................................................................................................................................................... 5.5W
Output Voltage, no load .............................................................................................................Internally Limited to 1600VRMS
Output Current............................................................................................................................ 7.5mARMS (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.
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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
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
4.75
5
5.25
4.5
5
3.5
5.5
4.0
2.0
635*
6.5
70
0.65 to 0.9
465
5
-20
550
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
² Total output power must not exceed 4W. Higher voltage lamps may require maximum output current to be set lower than 6.5mARMS
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
LXMG1618-05-4x
Min
Typ
Max
Units
OUTPUT PIN CHARACTERISTICS
IL(MAX)
Full Bright Lamp Current
IL(MAX)
Full Bright Lamp Current
IL(MAX)
Full Bright Lamp Current
IL(MAX)
Min. Average Lamp Current
Lamp Start Voltage
Operating Frequency
IL(MIN)
VLS
fO
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Ground, ISET2 = Ground
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Ground, ISET2 = Open
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Open, ISET2 = Ground
VBRT_ADJ > 2.0VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = Open, ISET2 = Open
VBRT_ADJ =0.65VDC, SLEEP > 2.0V, VIN1 = 5VDC
ISET1 = ISET2 = Ground
-20°C < TA < 70°C, VIN1 > 4.5VDC
VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 5V
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
1.5 *
1300
1400
76
80
mARMS
VRMS
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.
Copyright © 2002
Rev. 1.0a, 2006-11-13
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
ELECTRICALS
Full Bright Lamp Current
PanelMatch™
®
TM
LXMG1618-05-4x
5V 4W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
Parameter
`
Symbol
`
`
LXMG1618-05-4x
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
Minimum Input for Min. Lamp Current
VBRT_ADJ
IO(LAMP) = Minimum Lamp Current
2.0
2.05
VDC
0.65*
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 = 5VDC, SLEEP < 0.8V
0.0
VIN1 = 5VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 550VRMS
VIN1 = 5VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 550VRMS
5
20
µADC
830
mADC
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
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
VIN1
Main Input Power Supply (4.75V < VIN1 < 5.25V)
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
VHI
High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT
connect to Ground.
CN2-2
VLO
Connection to low side of lamp. Connect to lamp terminal with longer lead length.
DO NOT connect to Ground
Copyright © 2002
Rev. 1.0a, 2006-11-13
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
ELECTRICALS
CN2 for LXMG1618-05-41 and -42 (JST SM02(8.0)B-BHS-1-TB(LF)(SN) / Yeon Ho 20015WR-05A00 or SM02B-BHSS-1-TB(LF)(SN) / Yeon
Ho 35001WR-02A00)
PanelMatch™
®
TM
LXMG1618-05-4x
5V 4W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
WWW . Microsemi .C OM
TABLE 1 SETTING OUTPUT CURRENT
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
LXMG1618-05-4X
86mm
71mm
3.39in
MOUNTING HOLE
2.80in
2.44MM ±0.08 DIA.
X CN1
16mm
3.5mm
0.63in.
0.138in.
9mm ±2mm
0.354 in.
CN2
12.5mm
0.492in
W
11mm
GROUNDED MOUNTING
HOLE 2.44MM ±0.08 DIA.
0.433in.
60mm ±0.2mm
2.36in.
0.8mm
4.6mm Max
0.0315in.
0.181in.
PCB tolerances ± 0.5mm, M2 or 2-56 recommended mounting screws
R1.0
Warning
High Voltage Present at
high side of transformer
Weight: (5.7g) typ. and Output Connector
All dimensions are in millimeters, inches are for reference only
SIMPLIFIED BLOCK DIAGRAM
High Voltage
Transformer
Controller
10K
V BRITE
Comparator
+
0.65 2V DC
Ramp
-
Ramp
Gen
V IN1
OC SENSE
PACKAGE DATA
+3V
Transformer
Driver
V HI
LAMP
+3V
10K
SET 1
SET 2
Copyright © 2002
Rev. 1.0a, 2006-11-13
+3V
OV SENSE
10K
I SENSE
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
V LO
Page 4
PanelMatch™
®
TM
LXMG1618-05-4x
5V 4W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
5V
DAC or
Pot
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 and efficiency 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 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.
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.
VHI
LXMG1618-05-4x
2.7K
SLEEP
SET1
SET2
CCFL
TUBE
VLO
GND
NC
NC
Figure 1 – Brightness Control
(output current set to maximum)
PWM Signal
from System
BRITE
P.W.
LXMG1618-05-4x
10µs to 125µS
~26 < P.W. < 100%
of period
Figure 1A – PWM Brightness Control
5V
VIN1
BRITE
VHI
CCFL
TUBE
LXMG1618-05-4x
SLEEP
SET1
L
L
H
H
SET2
GND
VLO
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. 1.0a, 2006-11-13
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
APPLICATION
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.
VIN1
BRITE
0.65V
20K
to
2.0V
ƒ
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TYPICAL APPLICATION
PanelMatch™
TM
®
LXMG1618-05-4x
5V 4W CCFL Programmable Inverter Module
P RODUCTION D ATASHEET
NOTES
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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. 1.0a, 2006-11-13
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6