Microsemi LXMG1618-12-61 12v 6w ccfl programmable inverter module Datasheet

PanelMatch™
12V 6W CCFL Programmable Inverter Module
®
TM
LXMG1618-12-6x
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 a DC voltage
from the system battery or AC adapter
directly to high frequency, high-voltage
waves required to ignite and operate
CCFL lamps. A 5V input inverter is also
available (LXMG1618-05-6x).
The inverter’s 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 LXMG1618-12-6x is a Single
Output 6W 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 15” panels.
The maximum output current is
externally programmable over a range of 5
to 8mA in 1mA 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
Notebook Computers
Portable Instrumentation
Desktop Displays
Industrial Display Controls
STN Topology LCD Panels
ƒ
ƒ
ƒ
ƒ
ƒ
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",
VDC, OR POTENTIOMETER
Potentiometer
PWM
Signal
2
1
SELECTABLE MAXIMUM
5MA TO 8MARMS
W
OUPUT CURRENT
PACKAGE ORDER INFO
PART NUMBER
LXMG1618-12-61
LXMG1618-12-62
Copyright © 2002
Rev. 1.0a, 2006-11-13
OUTPUT CONNECTOR
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
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
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
JST BHR-03VS-1
JST BHSR-02VS-1
Page 1
LXMG1618-12-6X
3
DC Voltage
Source
PanelMatch™
12V 6W CCFL Programmable Inverter Module
®
TM
LXMG1618-12-6x
P RODUCTION D ATASHEET
Input Signal Voltage (VIN1).....................................................................................................................................-0.3V to 15V
Input Power .................................................................................................................................................................... 8.25W
Output Voltage, no load ............................................................................................................ Internally Limited to 1800VRMS
Output Current .............................................................................................................................10mARMS (Internally Limited)
Output Power ................................................................................................................................................................... 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
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
10.8
12
13.2
10.2
12
13.8
6.0
2.0
735*
8
70
0.65 to 0.9
545
5
-20
640
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
* Total output power must not exceed 6W. Higher voltage lamps may require maximum output current to be set lower than 8mARMS
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
LXMG1618-12-6x
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
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 = 0.65VDC, SLEEP > 2.0V, VIN1 = 12VDC
ISET1 = ISET2 = Ground
-20°C < TA < 70°C, VIN1 > 10.8VDC
4.4
5
5.6
mARMS
5.4
6
6.6
mARMS
6.4
7
7.6
mARMS
7.4
8
8.6
mARMS
1400
1.5 *
mARMS
1650
VRMS
Operating Frequency
fO
57
60
63
kHz
VBRT_ADJ = 2.5VDC, SLEEP > 2.0V, VIN1 = 12V
* 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. 1.0a, 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™
12V 6W CCFL Programmable Inverter Module
®
TM
LXMG1618-12-6x
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
µADC
µADC
VDC
VDC
2.05
0.65
SLEEP INPUT
RUN Mode
VSLEEP
2.0
5
VDC
SLEEP Mode
VSLEEP
-0.3
0.8
VDC
0.4
V
µA
20
µADC
SET1,2 INPUT
SET1,2 Low Threshold
Input Current
`
LXMG1618-12-6x
Min
Typ
Max
BRITE INPUT
Input Current
`
Test Conditions
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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.
VL
ISET
VSET ≤ 0.4V
-300
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 = 640VRMS
VIN1 = 12VDC, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 640VRMS
8
428
mADC
88
%
* 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 (10.8V < VIN1 < 13.2V)
GND
Power Supply Return
CN1-5
SLEEP
ON/OFF Control. (0V < SLEEP < 0.8 = OFF, SLEEP >= 2.0V = ON
CN1-6
BRITE
Brightness Control (0.65V to 2.0VDC). 2.0VDC gives maximum lamp current.
CN1-7
SET1
SET1 MSB Connecting this pin to ground decreases the output current 2 mA (see Table 1)
CN1-8
SET2
SET2 LSB Connecting this pin to ground decreases the output current 1 mA (see Table 1)
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 LXMG1618-12-61 and -62 (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™
12V 6W CCFL Programmable Inverter Module
®
TM
LXMG1618-12-6x
P RODUCTION D ATASHEET
WWW . Microsemi .C OM
TABLE 1
OUTPUT CURRENT SETTINGS
SET1
SET2
Nominal Output Current
(Pin 7)
(Pin 8)
Open*
Open*
8.0mA
Open*
Ground
7.0mA
Ground
Open*
6.0mA
Ground
Ground
5.0mA
* If driven by a logic signal it should be open collector or open drain only, not a voltage source.
PHYSICAL DIMENSIONS
LXMG1618-12-6X
100mm
85mm
3.94in.
MOUNTING HOLE
2.44MM –.08 DIA.
3.35in
X CN1
16mm
12.5mm
0.63in.
0.492in
CN2
X
3.5mm
0.138in.
GROUNDED MOUNTING HOLE
2.44MM –.08 DIA.
11mm
74mm –0.2mm
Warning
2.91in
High Voltage Present at
high side of Transformer
and Output Connector
0.433in.
1.0mm
0.0394in.
7.5mm Max
0.295in.
PCB tolerances – 0.2mm , M2 or 2-56 recommended mounting screws
Weight: (9g) typ .
All dimensions are in millimeters, inches for reference only
SIMPLIFIED BLOCK DIAGRAM
High Voltage
Transformer
Controller
VBRITE
10K
Comparator
+
0.65 2VDC
Ramp
-
Ramp
Gen
VIN1
OCSENSE
PACKAGE DATA
+3V
Transformer
Driver
VHI
LAMP
+3V
10K
SET1
SET2
Copyright © 2002
Rev. 1.0a, 2006-11-13
+3V
OVSENSE
10K
ISENSE
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
VLO
Page 4
PanelMatch™
12V 6W CCFL Programmable Inverter Module
®
TM
LXMG1618-12-6x
P RODUCTION D ATASHEET
12V
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 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 to 4 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
LXMG1618-12-6x
2.7K
CCFL
TUBE
VLO
SLEEP
SET1
SET2
GND
NC
NC
Figure 1 – Brightness Control
(Output current set to maximum)
PWM Signal
from System
BRITE
P.W.
LXMG1618-12-6x
10µs to 125µS
~26 < P.W. < 100% of period
Figure 1A – PWM Brightness Control
12V
BRITE
VIN1
VHI
CCFL
TUBE
LXMG1618-12-6x
SLEEP
SET1
SET2
GND
VLO
L
L
H
H
L
5.0mARMS
H
6.0mARMS
L
7.0mARMS
H
8.0mARMS
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 microcontroller 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
LXMG1618-12-6x
12V 6W 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
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