Microsemi LXMG1618A-12-41 12v 4w ccfl programmable inverter module Datasheet

PanelMatch™ "A Series"
12V 4W CCFL Programmable Inverter Module
®
TM
LXMG1618A-12-4x
P RODUCTION D ATASHEET
KEY FEATURES
DESCRIPTION
from the system battery, or AC adapter
directly to high frequency, high-voltage
waveform required to ignite and operate
CCFL lamps. A 5V input inverter is also
available (LXMG1618A-05-4x).
The LXMG1618A modules contain
the newer highly integrated LX1691B
CCFL backlight controller IC to provide a
wider temperature range (-30°C to 80°C)
compared to the existing solutions offered
by Microsemi.
Other benefits of the inverter’s
topology include stable fixed-frequency
operation, secondary-side strike voltage
regulation and both open/shorted lamp
protection with fault timeout.
The new LXMG1618A (“A Series”)
modules are designed therefore as a
higher
performance
near
drop-in
replacement (see BRITE minimum input)
for those customers and applications
currently using the LXMG1618 inverters.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
Protected By U.S. Patents: 5,923,129; 59320,121; 6,198,234; Patents Pending
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 -30°C to 80°C
ƒ UL60950 E175910
ƒ RoHS Compliant
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The LXMG1618A-12-4x™ is a Single
Output 4W Direct Drive™ CCFL (Cold
Cathode Fluorescent Lamp) Inverter
Module designed for driving LCD
backlight lamps. It is ideal for driving
typically 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 (PanelMatch) to
allow the inverter to properly match to a
wide array of LCD panel lamp current
specifications. The modules include a
dimming input that permits brightness
control from a DC voltage source, a PWM
signal or an external potentiometer.
LXMG1618A modules unlike the
LXMG1617A series do not provide wide
range ‘burst’ mode dimming, rather
dimming is provided by amplitude control
of the output current waveform, and this
limits the potential dim range to typically
less than 5:1.
The module converts a DC voltage
APPLICATIONS
ƒ Medical Instrument Displays
ƒ Portable Instrumentation
ƒ Industrial Display Controls
BENEFITS
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
PRODUCT HIGHLIGHT
UNIVERSAL DIMMING INPUT
"PWM", VDC,
Potentiometer
POTENTIOMETER
PWM
Signal
1
W
SELECTABLE MAXIMUM OUPUT CURRENT
5MARMS TO 6.5MARMS
PACKAGE ORDER INFO
PART NUMBER
LXMG1618A-12-41
LXMG1618A-12-42
Copyright © 2007
Rev. 1.1, 2009-11-03
OUTPUT CONNECTOR
JST SM02(8.0)B-BHS-1-TB (LF)(SN), Yeon Ho 20015WR-05A00 or equivalent
JST SM02B-BHSS-1-TB (LF)(SN), Yeon Ho 35001WR-02A00 or equivalent
INVERTER MATES DIRECTLY
TO PANEL CONNECTORS
JST BHR-03VS-1
JST BHSR-02VS-1
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 1
LXMG1618A-12-4X
2
3
DC Voltage
Source
OR
PanelMatch™ "A Series"
12V 4W CCFL Programmable Inverter Module
®
TM
LXMG1618A-12-4x
P RODUCTION D ATASHEET
Input Signal Voltage (VIN) ......................................................................................................................................-0.3V to 15V
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 VIN
Input Signal Voltage (BRITE) ...............................................................................................................................-0.3V to 5.5V
Ambient Operating Temperature, zero airflow.....................................................................................................-30°C to 80°C
Storage Temperature Range...............................................................................................................................-40°C to 85°C
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
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, may 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
VIN
PO
VBRT_ADJ
VLAMP
IO(LAMP)
TA
Recommended Operating Conditions
Min
R.C.
Max
10.8
12
13.2
10.2
12
3.5
13.8
4.0
2.0
635*
6.5
80
0
465
5
-30
550
Units
V
W
V
VRMS
mARMS
°C
¹ The BRITE minimum input voltage level is 0V, whereas it is 0.65V in the original LXMG1618-12-4x inverter, see application info on page 5. The minimum
VBRT ADJ voltage depends on the panel characteristics and minimum lamp current specification, depending on the panel requirement it can vary from 0V to 0.5V
* Total output power must not exceed 4W. Higher voltage lamps may require maximum output current to be set lower than 6.5mARMS
ELECTRICAL CHARACTERISTICS
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
LXMG1618A-12-4x
Min
Typ
Max
Units
OUTPUT PIN CHARACTERISTICS
fO
VBRT_ADJ = 2.0V, SLEEP ≥ 2.0V, VIN = 12V
IL(MAX)
Full Bright Lamp Current
IL(MAX)
Full Bright Lamp Current
IL(MAX)
Full Bright Lamp Current
IL(MAX)
Min. Average Lamp Current²
Lamp Start Voltage
Operating Frequency
IL(MIN)
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
1.6
mARMS
1300
1400
VRMS
76
80
83
kHz
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 lamp current.
Copyright © 2007
Rev. 1.1, 2009-11-03
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 2
ELECTRICALS
VLS
VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 12V
ISET1 = Ground, ISET2 = Ground
VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 12V
ISET1 = Ground, ISET2 = Open
VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 12V
ISET1 = Open, ISET2 = Ground
VBRT_ADJ ≥ 2.0V, SLEEP ≥ 2.0V, VIN = 12V
ISET1 = Open, ISET2 = Open
VBRT_ADJ = 0V, SLEEP ≥ 2.0V, VIN = 12V
ISET1 = ISET2 = Gnd
-30°C < TA < 80°C, VIN > 10.8V
Full Bright Lamp Current
PanelMatch™ "A Series"
12V 4W CCFL Programmable Inverter Module
®
TM
LXMG1618A-12-4x
P RODUCTION D ATASHEET
The following specifications apply over the recommended operating condition and ambient temperature of 0°C to 60°C except where
otherwise noted.
Parameter
`
Symbol
`
`
LXMG1618A-12-4x
Min
Typ
Max
Units
-9
0
µA
µA
BRITE INPUT
Input Current
`
Test Conditions
IBRT
VBRT_ADJ = 0V
VBRT_ADJ = 3V
Minimum Input for Max. Lamp Current
VBRT_ADJ
IO(LAMP) = Maximum Lamp Current
Maximum Input for Min. Lamp Current³
VBRT_ADJ
IO(LAMP) = Minimum Lamp Current
Minimum PWM Input Frequency
1.8
2.0
V
0
V
FBRT_PWM
2
kHz
RUN Mode
VSLEEP
2.0
V
SLEEP Mode
VSLEEP
-0.3
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ELECTRICAL CHARACTERISTICS (CONTINUED)
SLEEP BAR INPUT
0.8
V
SET1,2 INPUT
SET1,2 Low Threshold
VL
Input Current
ISET
VSET = 0V
0
V
-270
µA
POWER CHARACTERISTICS
Sleep Current
IIN(MIN)
Run Current
IRUN
Run Current Ripple Voltage
Typical Efficiency
IRIPPLE
η
5
VIN = 12V, SLEEP ≤ 0.8V
VIN = 12V, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 550VRMS
VIN = 12V, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 550VRMS
VIN = 12V, SLEEP ≥ 2.0V, ISET1 = Open
ISET2 = Ground, VLAMP = 550VRMS
20
µA
343
mA
330
mVpp
85
%
³ The BRITE minimum input voltage level is 0V, whereas it is 0.65V in the original LXMG1618-12-4x inverter.
FUNCTIONAL PIN DESCRIPTION
CONN
PIN
DESCRIPTION
CN1 (Molex 53261-0871 or equivalent) Mates with 51021-0800 housing, 50079-8100 pins. Mates with LX9501G input cable
assembly
CN1-1
CN1-2
CN1-3
CN1-4
VIN
GND
Main Input Power Supply (10.8V < VIN < 13.2V)
Power Supply Return
SLEEP
ON/OFF Control. (0V < SLEEP ≤ 0.8V = OFF, SLEEP ≥ 2.0V = ON)
CN1-6
BRITE
Brightness Control (0V to 2.0V). 2.0V gives maximum lamp current.
CN1-7
SET1
SET1 MSB Connecting this pin to ground decreases the output current (see Table 1)
SET2
SET2 LSB Connecting this pin to ground decreases the output current (see Table 1)
CN1-8
CN2 for LXMG1618A-12-41 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) or equivalent
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 © 2007
Rev. 1.1, 2009-11-03
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 3
ELECTRICALS
CN1-5
PanelMatch™ "A Series"
12V 4W CCFL Programmable Inverter Module
®
TM
LXMG1618A-12-4x
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
LXMG1618A-12-4X
86mm
71mm
3.39in.
MOUNTING HOLE
2.44MM ±0.08 DIA.
2.80in.
X
CN1
16mm
3.5mm
0.63in.
0.138in.
9mm
±0.2mm
12.5mm
0.354in.
0.492in.
Warning
High Voltage is present at high
side of transformer, its core
and the high side of the output
connector, please provide at
least 2 mm clearance (in all
directions) on the component
side of the board to any
conductor when mounting
CN2
W
GROUNDED MOUNTING
HOLE 2.44MM ±0.08
11mm
DIA.
60mm ± 0.2mm
2.36in.
0.433in.
0.8mm ±0.1mm
0.0315in.
6.2mm Max
0.244in.
Weight: (6g) typ.
R1.0
PCB tolerances ± 0.5mm, M2 or 2-56 recommended mounting screws
All dimensions are in millimeters, inches are for reference only
SIMPLIFIED BLOCK DIAGRAM
High
Voltage
Transformer
267k
V BRITE
0 to 2V
Controller &
Transformer
Driver
71.5k
DC
220nF
HI
V IN
OC SENSE
PACKAGE DATA
+3V
V
LAMP
+3V
10k
SET 1
SET 2
Copyright © 2007
Rev. 1.1, 2009-11-03
+3V
10k
OV SENSE
I SENSE
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
V
LO
Page 4
PanelMatch™ "A Series"
12V 4W CCFL Programmable Inverter Module
®
TM
LXMG1618A-12-4x
P RODUCTION D ATASHEET
TYPICAL APPLICATION
0V to
2.0V
VIN
BRITE
VHI
500k
LXMG1618A-12-4x
SLEEP
SET1
SET2
GND
CCFL
TUBE
VLO
ƒ
NC
NC
ƒ
Figure 1 – Brightness Control
(output current set to maximum)
ƒ
PWM Signal
from System
BRITE
P.W.
LXMG1618A-12-4x
10µs to 500µS
0 < P.W. < 100% of period
Figure 1A – PWM Brightness Control
VIN
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 up to about one
second, after which (without success) the inverter will
shutdown. Supply current draw in the shutdown mode is
about 10mA. In order to restart the inverter it is necessary
to toggle the sleep input or cycle the VIN input supply.
CCFL
TUBE
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 © 2007
Rev. 1.1, 2009-11-03
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 5
APPLICATION
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 an 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 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 user’s responsibility since
not all lamps are designed to be overdriven.
VHI
LXMG1618A-12-4x
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.
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 manufacturers. Generally the best
lamp lifetime correlates with driving the CCFL at the
manufacturer’s 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
12V
BRITE
The brightness control may be a voltage output DAC or
other voltage source, a digital pot or 500K manual pot. The
inverter contains effectively an internal 338k pull-up to 3V
to bias the pot, if desired; add a resistor to set the lower
threshold voltage above the absolute minimum dim level
capability. A PWM logic level signal (figure 1A) may be
used up to 5V; however the inverter will reach maximum
current at less than 100% duty cycle. This can be
calculated as approximately 2V divided by the logic high
voltage level; with 3.3V logic level this corresponds to
about 60% duty cycle for maximum lamp current.
If you need to turn the inverter ON/OFF remotely, connect
to TTL logic signal to the SLEEP input.
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ƒ
12V
DAC or
Pot
PanelMatch™ "A Series"
TM
LXMG1618A-12-4x
12V 4W CCFL Programmable Inverter Module
®
P RODUCTION D ATASHEET
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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. 1.1, 2009-11-03
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, 800-877-6458, Fax: 714-893-2570
Page 6
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