MICROSEMI LXMG1614E-14-11

RangeMAX™
®
TM
LXMG1614E-14-11
DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE
P RODUCTION D ATASHEET
LXMG1614E series of Direct Drive™
CCFL (Cold Cathode Fluorescent Lamp)
Inverter Modules is specifically designed
for driving LCD backlight lamps.
Although similar to the RangeMAX
LXMG1612 wide range dimming
inverters, the LXMG1614E family offers
two separate brightness controls for lamp
current amplitude and duty cycle. This
innovation of dual brightness control with
extended dimming, combined with
Microsemi’s high efficiency Direct Drive
topology, provides the industry’s most
feature rich, small form factor inverter
available. The wide range dimming provides exceptional display readability at
less than 1% of full brightness, allowing
both power savings and low ambient light
operating capability.
KEY FEATURES
The
adjustments utilizing standard lamp current
amplitude control as well as supporting
Microsemi’s RangeMAX wide range
dimming technique. Combining both
brightness controls into a single inverter
supports the “self heating” lamp technology by using a “boost” current
feature and still offers duty cycle control
for low brightness operation.
This
controlled
overdrive
capability
eliminates the need for traditional
resistive heater wire methods to ensure
light output at extremely low
temperatures. The LXMG1614E brightness controls support temperature
monitoring
with
look-up
table
applications by accepting either a PWM
input or DC voltage. Large panel lamps
with greater thermal inertia can also
utilize this “instant-bright” feature and
minimize warm up time.
(continued next page)
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; Patents Pending
PRODUCT HIGHLIGHT
ƒ Independent Brightness
Controls For Lamp Current
Amplitude and Duty Cycle
ƒ RangeMAX 1-100% Wide
Range Dimming with
Controlled Overdrive Boost
ƒ On-Board Thermister Automatically Limits Maximum
Lamp Current
ƒ Supports Wide Input Voltage
Range 9-16V
ƒ High Efficiency, Single Stage
Direct Drive Topology
ƒ -40°C to +85°C Ambient
Temperature Operation
ƒ Output Open/Short Circuit
Protection
ƒ Up to 2000V Output Voltage
Capability
ƒ Single Side PCB Component
Layout
ƒ RoHS Compliant
ƒ UL60950 E175910
APPLICATIONS
ƒ Self Heating And High
Pressure Lamp Technology
ƒ Automotive Navigation, GPS
Systems, Auto PC
ƒ Extended Cold Temperature
Operation
ƒ Aircraft Cabin Displays
ƒ Low Ambient Light Conditions
Requiring Wide Range
Dimming
ƒ “Instant On” To Full
Brightness For Large LCD
Backlight Panels
ƒ Industrial Notebook And
Workstations
LXMG1614E-14-11
Controlled overdrive mode of
LXMG1614E Inverter accelerates
lamp warm-up time to provide
maximum light output even in
extreme temperature environments
MODULE ORDER INFO
PART NUMBER
OUTPUT CONNECTOR
INVERTER MATES DIRECTLY TO
PANEL CONNECTORS
LXMG1614E-14-11
JST SM02(8.0)B-BHS-1-TB (LF)(SN)
JST BHR-03VS-1
Copyright © 2005
Rev. 1.0a,2006-09-13
WWW . Microsemi .C OM
DESCRIPTION
Dual Drive, RangeMAX™ Wide Range
Dual Drive Dimming Control.
Dimming, Single Output Inverter. The inverters
provide brightness
Microsemi
Microsemi Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
RangeMAX™
DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE
®
TM
LXMG1614E-14-11
P RODUCTION D ATASHEET
Direct Drive Technology.
An on-board thermister monitors the inverter’s relative
The module design is based on the Direct Drive topology,
temperature and limits the maximum allowable lamp
current. This current limit automatically protects the lamp which provides a number of cost, performance, and form
The LXMG1614E series inverters
and inverter as a function of temperature, which helps factor advantages.
eliminate
the
classic
resonant inductor/capacitors and
control the system during Boost mode.
integrate
the
wide
range
dimming
logic into the controller.
RangeMAX Digital Dimming Technique.
Digital dimming provides flicker-free brightness control
in any wide range dimming application. With many panels
dimming ratios greater than 100:1 can be achieved. A
video synchronization feature allows wide ratio dimming
without the display disturbances and interference seen with
competitive products. The resultant “burst drive” that
energized the lamp was designed specifically to ensure that
no premature lamp degradation occurs. Even in overdrive
boost mode, the waveform is carefully controlled to
minimize the effects that are detrimental to lamp life.
Individual panel specifications should be referenced for
specific thermal and electrical parameters.
Additional Features.
Other benefits of this new topology are fixed-frequency
operation and secondary-side strike-voltage regulation.
Strike-voltage regulation minimizes corona discharge in the
output transformer and related circuitry, providing longer life
and higher reliability. All LXMG1614E modules feature
both open and shorted lamp protection. The dual drive
LXMG1614E is fully customizable (electronically and
mechanically) to specific customer requirements.
WWW . Microsemi .C OM
DESCRIPTION (CONTINUED)
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Input Supply Voltage (VIN) ................................................................................................................................... -0.3V to 17V
Output Voltage, no load .......................................................................................................... Internally Limited to 2000VRMS
Output Current full boost ................................................................................................... 13mARMS (<2 minutes @TA<25°C)
Output Current nominal boost ................................................................................................................................. 6.1mARMS
Output Power ......................................................................................................................................... 10W (-40°C to 25°C)
Output Power ............................................................................................................................................ 6W (26°C to 85°C)
Input Signal Voltage (BRITE, BOOST)............................................................................................................... -0.3V to 5.5V
Input Signal Voltage (SLEEP, VSYNC) ................................................................................................................. -0.3V to 5.5V
Ambient Operating Temperature, zero airflow ..................................................................................................-40°C to 85°C
Operating Relative Humidity, non-condensing ...............................................................................................................≤90%
Storage Temperature Range ..........................................................................................................................-40°C to 125°C
RECOMMENDED OPERATING CONDITIONS
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
VIN
Output Power
PO
Brightness Control Input Voltage Range
VBRT_ADJ
BOOST Control Input Voltage Range
9.0
12
0.0
Units
16.0
V
6.0
W
5.0
V
VBST_ADJ
0.0
5.0
V
Lamp Operating Voltage
VLAMP
500
1000
VRMS
Lamp Current Full Brightness
IOLAMP
3.5
9.0
mARMS
TA
-40
85
°C
Operating Ambient Temperature Range
Copyright © 2005
Rev. 1.0a,2006-09-13
1.5
Microsemi
Microsemi Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
DESCRIPTION
VIN Voltage Range
Recommended Operating Conditions
Min
R.C.
Max
Page 2
RangeMAX™
®
TM
LXMG1614E-14-11
DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE
P RODUCTION D ATASHEET
ELECTRICAL CHARACTERISTICS
Parameter
`
Lamp Current, Full Boost
IL(BOOST5)
Lamp Current, Full Boost
IL(BOOST1.5)
Lamp Current, No Boost
IL(BOOST0)
Lamp Start Voltage
VIN=9V, BRITE= 5V, BOOST= 5V, TA per
Figure 9
VIN=9V, BRITE= 5V, BOOST= 1.5V, TA per
Figure 9
VIN=9V, BRITE= 5V, BOOST= 0V, TA per
Figure 9
Units
8
8.8
9.4
mARMS
5
5.7
6.4
mARMS
3
3.8
4.6
mARMS
BRITE = BOOST = 0V
.12
mARMS
2000
BRITE= 5V
55
TFAULT
65
75
1.0
VRMS
KHz
SEC
BRITE INPUT
Linear Dim Control Range
Input Current
VBRT
IBRT
0.5
BRITE= 0V
BRITE= 5V
Input Voltage for Max. Lamp Current
VBRT_ADJ
IO(LAMP) = 100% Duty Cycle
Input Voltage for Min. Lamp Current
VBRT_ADJ
IO(LAMP) = Minimum Duty Cycle
4.5
10
10
VDC
µADC
µADC
4.5
5.0
VDC
0
0.5
VDC
BOOST INPUT
Linear Dim Control Range
Input Current
`
IL(MIN)
FO
Fault Timeout
`
LXMG1614E-14-11
Min
Typ Max
VLS
Operating Frequency
`
Test Conditions
OUTPUT PIN CHARACTERISTICS
Min. Average Lamp Current (Note 2)
`
Symbol
WWW . Microsemi .C OM
Unless otherwise specified, these specifications apply over the recommended operating conditions and TA = -40 to 85°C ambient temperature for the
LXMG1614E-14-11.
VBST
IBOOST
0.5
BOOST= 0V
BOOST= 5V
4.5
10
10
VDC
µADC
µADC
Input Voltage for Max. Boost Current
VBST_ADJ
4.5
5.0
VDC
Input Voltage for Min. Boost Current
VBST_ADJ
0
0.5
VDC
RUN Mode
VSLEEP
2.4
VIN
VDC
OFF Mode
VSLEEP
0
0.8
VDC
Input Current
IISLEEP
SLEEP INPUT
SLEEP = 5V
110
SLEEP = 0V
0
µA
VSYNC CHARACTERISTICS
VSYNC (HI)
2.4
5.5
VDC
Logic Low Level
VSYNC (LO)
-0.3
0.8
VDC
Input Impedance
ZIN
Input Frequency
FVSYNC
Minimum pulse width >1µS
50
Output Burst Rate
FBURST
VSYNC=0V, Free Run Frequency
135
KΩ
10
170
120
Hz
195
Hz
Note 2: Minimum lamp current required to maintain even light output may vary with display panel.
Average RMS current = (burst duty cycle) X (burst amplitude of full lamp current)
Copyright © 2005
Rev. 1.0a,2006-09-13
Microsemi
Microsemi Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
ELECTRICALS
Logic High Level
RangeMAX™
DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE
®
TM
LXMG1614E-14-11
P RODUCTION D ATASHEET
FUNCTIONAL PIN DESCRIPTION
Pin
WWW . Microsemi .C OM
Conn.
Description
CN1 (Molex 53261-0871)*
CN1-1,2
CN1-3,4
VIN
GND
Main Input Power Supply (9V to 16V)
Power Supply Return
CN1-5
SLEEP > 2.4V (Backlight on), < 0.8V (Backlight off), IISLEEP=110µA @ 5.0V
CN1-6
BOOST Lamp Current Amplitude Control (0.5-4.5VDC) 4.5VDC gives maximum boost
CN1-7
BRITE Brightness Control (0.5- 4.5VDC) 4.5VDC gives maximum lamp current
CN1-8
VSYNC
Vertical Synchronization Input (50 < fSYNC < 120Hz), minimum pulse width 10µS
CN2 (JST SM02(8.0)B-BHS-1-TB(LF)(SN))
CN2-1
CN2-2
VOUT1
VOUT2
High Voltage CCFL Lamp Supply
High Voltage CCFL Lamp Return
* LX9501G Mating Connector Assembly Available
PHYSICAL DIMENSIONS
120mm
10mm
4.724in.
0.394in.
X CN1
23mm
20mm
0.905in.
0.787in.
3mm ± .08mm
CN2
W
0.118in.
10mm
0.394in.
130mm
5.118in.
8.5mm
0.335in.
PCB tolerances ± 0.5mm
Weight: 12.5(g) typ.
1mm
0.0393in.
All Dimensions are millimeters. Inches for reference only
MECHANICALS
Copyright © 2005
Rev. 1.0a,2006-09-13
Microsemi
Microsemi Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
RangeMAX™
®
TM
LXMG1614E-14-11
DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE
P RODUCTION D ATASHEET
High Voltage
Transformer
Gain &
Summing
Comparator
VBRT
0.5 4.5VDC
VSYNC
Ramp
VOUT1
Transformer
Driver
LAMP
VBST
0.5 4.5VDC
WWW . Microsemi .C OM
HOW THE RANGEMAX WORKS
VSENSE
ISENSE
+
Ramp Gen.
& PLL
Temperature
Sense
I/V
VOUT2
Figure 1 – RangeMAX Simplified Block Diagram
HIGHLIGHTS
•
Copyright © 2005
Rev. 1.0a,2006-09-13
•
In applications with no access to a vertical sync, an
onboard oscillator operates the inverter burst rate at
about 170Hz. In this non-synchronous mode, minor
display disturbances can be found under certain video
conditions. This performance may be acceptable for
many applications, but synchronization must be used
when no disturbance can be tolerated.
• Separate feedback loops for lamp current and open
circuit voltage regulation insure reliable strike under all
operating conditions, automatic over-voltage prevention
with broken or failed lamps, and accurate lamp current
regulation.
• A single input will accommodate negative and positive
vertical sync pulses at any pulse width.
Microsemi
Microsemi Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
DESCRIPTION
Integrated dual brightness control circuit includes a DC
voltage to pulse width converter that minimizes system
design work and system noise susceptibility. This provides
a familiar and convenient interface while reducing the
potential for externally induced noise, which can cause
lamp flicker.
• RangeMAX inverter modules are designed to operate with
the burst frequency synchronized to the video frame rate.
This provides operation with no visible display disturbances
caused by beat frequencies between the lamps and video
frame rates. In this synchronous mode, the inverter burst
rate operates at twice the video refresh rate; well beyond
standard 50/60Hz video refresh rates where the eye can
perceive pulsing light. The frequency at the VSYNC input
will affect the minimum dimming level. Generally, the
potential dimming (or brightness) range is inversely
proportional to the VSYNC frequency.
RangeMAX™
®
TM
LXMG1614E-14-11
DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE
P RODUCTION D ATASHEET
WWW . Microsemi .C OM
HOW THE RANGEMAX WORKS (CONTINUED)
LAMP VOLTAGE & LAMP CURRENT – BURST MODE OPERATION
Figure 2 – LXMG1614E Combines Current Amplitude and Digital Techniques
The LXMG1614E provides both lamp current amplitude
control (BOOST) and a brightness control (BRITE) for
dimming. Please see following sections for dimming and
amplitude boost control. To achieve extremely wide dimming
ranges, rather than only using the traditional dimming technique
of varying lamp current magnitude to adjust light output,
RangeMAX inverters utilize a fixed lamp current value with a
duty cycle control method.
The lamp current burst width can be modulated from 100%
(continuous lamp current) down to a 2% duty cycle, allowing
the lamp to be dimmed to less than 2% of its full brightness
As can be seen in Trace 4 of Figure 5, careful design
consideration was given to controlling lamp start voltage to
softly start current flow. This eliminates current overshoot
that can result in premature cathode wear and reduce lamp
life.
Figure 3 – 50% Burst Duty Cycle
Figure 4 – 2% Burst Duty Cycle
DESCRIPTION
Figure 5 – 2% Burst Duty Cycle (Expanded Time Base)
Copyright © 2005
Rev. 1.0a,2006-09-13
Microsemi
Microsemi Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
RangeMAX™
DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE
®
TM
LXMG1614E-14-11
P RODUCTION D ATASHEET
DUAL DIMMING CAPABILITY
As seen in the Brightness vs. Time graphs, the boost mode
operation can improve the performance of cold cathode
florescent lamps in any LCD application by reducing the time it
takes to warm up lamps to their optimum operating
temperature. This feature is helpful in large LCD multi-lamp
monitors as well as automotive or industrial extreme
temperature applications.
The “boost” control provides a timed overdrive mode to
maximize light output over temperature. After a panel is
characterized with a profile of the user’s application (such as
desired light output as a function of ambient light and
temperature), the appropriate boost level, and duration of the
boost can be set. Further wide range dimming control is
provided by the Brite input dimming function.
WWW . Microsemi .C OM
HOW THE RANGEMAX WORKS (CONTINUED)
Figure 6
DESCRIPTION
Figure 7
Copyright © 2005
Rev. 1.0a,2006-09-13
Microsemi
Microsemi Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
RangeMAX™
DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE
®
TM
LXMG1614E-14-11
P RODUCTION D ATASHEET
WIDE RANGE DIMMING FUNCTION
AMPLITUDE BOOST FUNCTION
Dimming can be controlled by a DC voltage (like a voltage
output DAC) or by a PWM signal (5V logic level PWM signal
from a micro controller). The PWM signal should be 400Hz to
4kHz, 0V to 5V, 0% to 100% duty cycle.
The Boost Function Control signal levels are the same as
the Dimming Control. Less than 0.5V provides 4mA
maximum lamp current while 4.5V on Boost provides “max
boost” with a max lamp current of 9mA. Please note that
these maximum lamp current levels are protected by the onboard thermistor, which limits the maximum lamp current
automatically as a function of temperature as seen in Figure
9.
Brightness
Lamp Current (mArms)
control range
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HOW THE RANGEMAX WORKS (CONTINUED)
control range
100%
boost mode
9
VIN = 9V
4
no boost mode
Typical curve for 5.8” panel. Other
panels may be different.
1%
BRITE
0.0 V
0.5 V
4.5 V
IBOOST
5.0 V
0.0
Figure 8 – Typical brightness as a function of the BRITE control
(CN1-7)
0.5
4.5
5.0
Figure 9 – Typical maximum lamp current as a function of the Boost
control (CN1-6)
Lamp Current (mArms)
9.0
7.5
5.5
VIN = 9V
4.0
Temp
-40
25
85°C
0
Figure 10 – Typical maximum lamp current as a function of ambient
temperature
Copyright © 2005
Rev. 1.0a,2006-09-13
Microsemi
Microsemi Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
DESCRIPTION
Typical curve for 5.8” panel.
Other panels may be different.
RangeMAX™
®
TM
LXMG1614E-14-11
DUAL DIMMING, EXTENDED TEMPERATURE CCFL INVERTER MODULE
P RODUCTION D ATASHEET
•
9V-16V
BOOST
VIN
BRITE
VOUT1
LXMG1614E-14-11
0V
2.5V
SLEEP
SYNC
GND
CCFL
TUBE
V OUT2
V SYNC
Figure 11 - Brightness Control
PWM Signal
from System
The BRITE/BOOST control may be a voltage output
DAC, or other voltage source as shown in Figure 11. A
5V Logic Level PWM signal from a micro-controller may
also be used as shown in Figure 12.
• If synchronization to the video frame rate is desired,
connect the vertical sync pulse from the system video
controller to the VSYNC input. If no video synchronization
is desired, connect VSYNC to ground.
• If you need to turn the inverter ON/OFF remotely, connect
a 2.4V to 5V logic signal to the SLEEP input. If remote
ON/OFF is not needed, connect the SLEEP input to VIN or
other voltage source between 2.4V and 5V.
• Connect VOUT1 to the high voltage supply wire from the
lamp. Connect VOUT2 to the high voltage return wire from
the lamp.
WWW . Microsemi .C OM
TYPICAL APPLICATION
RangeMAX INVERTERS
BOOST
BRITE
P.W.
LXMG1614E-14-11
2.5mS to 250µS
0 < P.W. < 100% of period
Also available in other wide range dimming single lamp
inverters
LXMG1612-xx-xx,
LXMG1615-03-xx,
LXMG1617/8-xx-xx, Dual Output, LXMG1623/4-xxxx, LXMG1626-xx-xx, and Quad Output LXMG164312-6x versions for multiple lamp applications. See the
Microsemi website www.microsemi.com for a current
list of available inverters products.
Figure 12 - PWM Brightness Control
APPLICATION
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,2006-09-13
Microsemi
Microsemi Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9