Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright © 2007
Rev. 1.2, 2010-08-20
WWW.Microsemi .COM
RangeMAX
™
LXMG1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
P
RODUCTION
D
ATA
S
HEET
TM ®
DESCRIPTION
The LXMG1621 Direct Drive™ CCFL
(Cold Cathode Fluorescent Lamp)
Inverter Modules are specifically
designed for driving two lamp LCD
backlight displays.
Similar to the LXMG1620, the
LXMG1621 excels in applications where
critical parameters include very wide
range dimmability, high efficiency, and
reliable fail-safe design in a small form
factor. These 12 volt modules are
specifically designed with desktop and
industrial applications in mind.
Unlike the LXMG1620 or any
traditional dimming CCFL inverters, the
LXMG1621 provides the designer a
vastly superior display brightness range.
100:1+ brightness range is achievable
with a standard LCD display (see Product
Highlight). Our wide range dimming
provides exceptio n al d isplay read ab ility at
less than 1% of full brightness, allowing
both power savings and low ambient light
operating capability(i.e. “night readable”).
Digital dimming provides flicker-free
brightness control in any wide-range
dimming appl icat i on.
Incorporation of a video synch-
ronization feature allows wide ratio
dimming without the display disturbances
and interference seen with competitive
products.
The modules are equipped with a
dimming input that permits brightness
control from an external potentiometer or
DC voltage source. The resultant “burst
drive” that energizes the lamp was
designed specifically to ensure that no
premature lamp degradation occurs (see
the “How RangeMAX works” section).
The module design is based on a new
Direct Drive topology, which provides a
number of cost and performance
advantages.
Microsemi’s multiple lamp inverters
include a built in connector array for the
most common LCD lamp configurations.
Other benefits of this new topology are
fixed-frequency operation and secondary-
side strike-voltage regulation.
The LXMG1621 is fully customizable
(electronically and mechanically) to
specific customer requirements.
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
KEY FEATURES
RangeMAX Wide Range Dimming
8V to 16V Input Voltage Range
Small Form Factor
Easy To Use Brightness Control
MicroAmp SLEEP Mode
Output Short-Circuit Protection
And Automatic Strike-Voltage
Regulation
Fixed Frequency Operation
Universal Connector
Configuration
RoHS Compliant
UL 60950 E17590
APPLICATIONS
Hi-Brite Displays
Desktop Displays
Low Ambient Light Conditions
(i.e. Aircraft Cabins, Automobile)
Industrial Applications
BENEFITS
High Efficiency Reduces Heating
Problems
Smooth, Flicker Free 0-100% Full-
Range Brightness Control Gives
Your Product A High Quality
Image
Output Open Circuit Voltage
Regulation Minimizes Corona
Discharge For Long Life And High
Reliability
Power Efficient, “Low Brightness”
Capability Allows For Advanced
Power Management
PRODUCT HIGHLIGHT
UNIVERSAL DIMMING INPUT
VDC OR POTENTIOMETER
123
W
1
2
3
W
BRITE
DC Voltage
Source Potentiometer
MODULE ORDER INFO
PART NUMBER LAMP
CURRENT LAMP RUN VOLTAGE (RMS)
LXMG1621-01 7mA 500-750
LXMG1621-02 6mA 350-550
LXMG1621-04 6mA 470-640
L
LX
XM
MG
G1
16
62
21
1-
-X
XX
X
Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright © 2007
Rev. 1.2, 2010-08-20
WWW.Microsemi .COM
RangeMAX
™
LXMG1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
P
RODUCTION
D
ATA
S
HEET
TM ®
ABSOLUTE MAXIMUM RATINGS (NOTE 1)
Input Supply Voltage (VIN) ................................................................................................................................ -0.3V to 18V
Output Voltage, no load ....................................................................................................... Internally Limited to 1800VRMS
Output Current ........................................................................................................................ 10mARMS (Internally Limited)
Output Power (pe r lam p) .................................................................................................................................................. 6W
Input Signal Voltage (BRITE Input) ................................................................................................................. -0.3V to 6.5V
Input Signal Voltage (SLEEP, VSYNC) ............................................................................................................... -0.3V to VIN
Ambient Operating Temp erature, zero airflow ................................................................................................... 0°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
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
Recommended Operating Conditions Units
Min R.C. Max
Input Supply Voltage Range (Functional) VIN 8 12 16 V
Input Supply Voltage (Fully Regulated Lamp Current) 10.2 12 13.8 V
Output Power (Per Lamp) LXMG1621-01
LXMG1621-02
LXMG1621-04 PO 4 5 W
2.5 3 W
2.75 3.5 W
Brightness Control Input Voltage Range VBRT
_
ADJ 0.0 2.5 V
Lamp Operating Voltage LXMG1621-01
LXMG1621-02
LXMG1621-04 VLAMP 500 625 750 VRMS
350 425 500 VRMS
470 550 640 VRMS
Lamp Current LXMG1621-01
(Full Brightness – Per Lamp) LXMG1621-02
LXMG1621-04 IOLAMP 7.0 mARMS
6.0 mARMS
6.0 mARMS
Operating Ambient Temperature Range T
A
0 70 °C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXMG1621-xx.
Parameter Symbol Test Conditions LXMG1621-xx Units
Min Typ Max
` OUTPUT PIN CHARACTERISTICS
Full Brightness Current LXMG1621-01
IL(MAX)
VBRT_ADJ = 2.5VDC, SLEEP = HIGH,
Burst Duty = 100%, VIN = 12VDC 6.3 7.0 7.7 mARMS
LXMG1621-02 VBRT_ADJ = 2.5VDC, SLEEP = HIGH,
Burst Duty = 100%, VIN = 12VDC 5.5 6.0 6.5 mARMS
LXMG1621-04 VBRT_ADJ = 2.5VDC, SLEEP = HIGH,
Burst Duty = 100%, VIN = 12VDC 5.5 6.0 6.5 mARMS
Minimum Lamp Current (Per Lamp)
(Notes 2 & 3) IL(MIN)
VBRT_ADJ = 0VDC, SLEEP = HIGH,
Burst Duty = 2%, VIN = 9VDC 0.14 mARMS
VBRT_ADJ = -50mVDC, SLEEP= HIGH,
Burst Duty =0.5%, VIN = 9VDC 0.035 mARMS
Lamp Start Voltage VLS 0°C < T
A
< 40°C, VIN > 10.8VDC 1500 1800 VRMS
Operating Frequency fO VBRT_ADJ = 2.5VDC, SLEEP= HIGH,
VIN = 12VDC 52 57 62 kHz
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Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Copyright © 2007
Rev. 1.2, 2010-08-20
WWW.Microsemi .COM
RangeMAX
™
LXMG1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
P
RODUCTION
D
ATA
S
HEET
TM ®
ELECTRICAL CHARACTERISTICS (CONTINUED)
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXMG1621-xx.
Parameter Symbol Test Conditions LXMG1621-xx Units
Min Typ Max
` BRITE INPUT
Input Current IBRT V
BRT_ADJ = 0V -6 -8 -10 µADC
Input Voltage For Max. Lamp Current VC I
O(LAMP) = 100% Duty Cycle 2.5 2.6 VDC
Input Voltage For Min. Lamp Current
(Note 3) VC IO(LAMP) = 2% Duty Cycle 0 0 VDC
I
O(LAMP) = 0.5% Duty Cycle -50 mVDC
` SLEEP INPUT
RUN Mode (HI)SLEEP
V 2.2 VIN V
DC
SLEEP Mode (LO)SLEEP
V -0.3 0.8 VDC
Input Current SLEEP
I SLEEP = 5.0V 70 75 100 µADC
` VSYNC CHARACTERISTICS
Logic High Level VSYNC(HI) 4.0 6.5 VDC
Logic Low Level VSYNC(LO) -0.3 1.0 VDC
Input Impedance ZIN 60 66 75
KΩ
Pulse Width (Note 4) tPW 25 250 µs
Input Frequency fSYNC 49 150 Hz
` POWER CHARACTERISTICS
Sleep Current IIN(MIN) VIN = 12VDC, SLEEP < 0.8V 5 50 µADC
Note 2: Minimum lamp current required to maintain even light output may vary with display panel.
Note 3: See 200:1 Dimming Application section for details.
Note 4: The module will be functional with pulse widths much larger than 250µs.
FUNCTIONAL PIN DESCRIPTION
Conn. Pin Description
CN1
CN1-1 VIN Input Power Supply (8V < VIN < 16V)
CN1-2
CN1-3 GND Power Supply Return
CN1-4
CN1-5 SLEEP ON / OFF Control. (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF)
CN1-6 BRITE Brightness Control (-0.3V to 2.5VDC). 2.5VDC gives maximum lamp current.
CN1-7, 8 VSYNC Vertical synchronization input 49Hz < fSYNC < 150Hz
CN2 thru CN5: Refer to Connection Schematic Section
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Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Copyright © 2007
Rev. 1.2, 2010-08-20
WWW.Microsemi .COM
RangeMAX
™
LXMG1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
P
RODUCTION
D
ATA
S
HEET
TM ®
PHYSICAL DIMENSIONS
LXMG1621-01 / 02
38mm
1.50 in 48mm
1.89 in
32mm
1.26 in.
124mm
4.88 in
CN2 CN3
W
Warning
High Voltage Present at
all Output Connectors
Weight: 23 (g) typ.
CN1
Backside
Connectors
CN2, CN3
6mm
0.24 in
∅3.0mm ±0.08 (0.12in)
Grounded Mounting Hole - 2plcs
1.52mm
0.60 in
PCB tolerances ±0.5mm
W
CN4 CN5
W
W
LXMG1621-04
38mm
1.50 in 48mm
1.89 in
32mm
1.26 in.
124mm
4.88 in
CN2 CN3
W
Warning
High Voltage Present at
all Output Connectors
Weight: 23 (g) typ.
CN1
Backside
Connectors
CN2, CN3
6mm
0.24 in
∅3.0mm ±0.08 (0.12in)
Grounded Mounting Hole - 2plcs
1.52mm
0.60 in
PCB tolerances ±0.5mm
W
All dimensions are in millimeters (inches for reference on ly)
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Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Copyright © 2007
Rev. 1.2, 2010-08-20
WWW.Microsemi .COM
RangeMAX
™
LXMG1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
P
RODUCTION
D
ATA
S
HEET
TM ®
TYPICAL CONNECTION CONFIGURATIONS
CCFL Lamps
Desktop Display
CN1
CN4
CN5
LXMG1621-01 / 02
CCFL Lamps
Desktop Display
CN1
CN4
CN5
LXMG1621-01 / 02
CCFL Lamps
Desktop Display
CN1
CN4
CN5
LXMG1621-01 / 02
CCFL Lamps
Desktop Display
CN1
CN4
CN5
LXMG1621-01 / 02
CCFL Lamps
Desktop Display
CN1
CN4
CN5
LXMG1621-01 / 02
CCFL Lamps
Desktop Display
CN1
CN4
CN5
LXMG1621-01 / 02
* Connectors CN2 and CN3 are on the bottom side of the inverter. View shown is looking through the board
Figure 1 – Connectivity Configuration Examples
These examples illustrate six typical LCD wiring configurations that are accommodated by Microsemi’s unique connector array.
Microsemi inverters have multiple lamp connector styles that are common to the industry, which are duplicated at both ends of the
module. This permits over 14 variations of module mounting and interconnectivity configuration.
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Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
Copyright © 2007
Rev. 1.2, 2010-08-20
WWW.Microsemi .COM
RangeMAX
™
LXMG1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
P
RODUCTION
D
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S
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TM ®
CONNECTION SCHEMATIC
CN1
W
CN4
WCN5
Inverter
Output 1
Inverter
Output 2
VHI1 VHI2
CN2 CN3
1
2
31
2
3
N.C
.N.C
.
1
2
3
4
4
3
2
1
W
W
Figure 2a – LXMG1621-01 / 02 Connection Schematic
CN1
W
CN2
W
CN3
Inverter
Output 1
Inverter
Output 2
VHI1 VHI2
1
2
3
3
2
1
Figure 2b – LXMG1621-04 Connection Schematic
Connectors: Mates With
CN1
Molex 53261-0871 Pins: 50079-8100*, Housing: 51021-0800
*Loose(-8000, Chain) Recommended #26 AwG wiring
Connection for LXMG1621-0 1 / 02
CN2, CN3
JST SM04(4.0)B-BHS-1-TB(LF )(SN)
or Yeon Ho 20015WR-07A00 JST BHR-04VS-1
CN4, CN5
JST SM03(4.0)B-BHS-1-TB(LF )(SN)
or Yeon Ho 20015WR-05A01 JST BHR-03VS-1
Connection for LXMG1621-04
CN2, CN3
JST SM03(4.0)B-BHS-1-TB(LF )(SN)
or Yeon Ho 20015WR-05A01 JST BHR-03VS-1
Connection Rules
1. Always insta ll two (2) la mps. Operating with only one lamp may overdrive lamp current at maximum brightness settings.
2. Verify lamp wiring before connecting lamps to the inverter module. Connecting both lamps to one of the two inverter output
circuits will result in reduced brightness. The LXMG1621-01 / 02 module connectors are wired per industry standard. The lamp
hot wires (high voltage wires) are always on pin 1 and / or 2, and the cold wire (low voltage wire) is always on pin 3 or 4.
3. The LXMG1621-04 uses the reverse pinout found in some panels. The lamp hot wires (high voltage wires) are on pins 2 and 3
and the cold (low voltage wire) is on pin 1.
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Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
Copyright © 2007
Rev. 1.2, 2010-08-20
WWW.Microsemi .COM
RangeMAX
™
LXMG1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
P
RODUCTION
D
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TM ®
HOW THE RANGEMAX WORKS
LAMP VOLTAGE & LAMP CURRENT – BURST MODE OPERATION
Figure 3 – 50% Burst Duty Cycle
Figure 4 – 2% Burst Duty Cycle
Rather than using the traditional dimming technique of
varying lamp current magnitude to adjust light output,
RangeMAX inverters use 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 1% of its full brightness.
As can be seen in Trace 3 of Figure 5 photo at right, 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 5 – 2% Burst Duty Cycle (Expanded Time Base)
Ramp Gen. Transformer
Driver
High Voltage
Transformer
Comparator
Ramp +
-
ISENSE
VSENSE
VBRITE
0.25 -
2.2VDC
VSYNC
LAMP
VLO
VHI
LAMP
VLO
VHI
Figure 6 – RangeMAX Simplified Block Diagram
HIGHLIGHTS
• Integrated 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 ex ternally ind uc ed no ise, wh ich
can cause lamp flicker.
• An on-board oscillator operates the inverter BURST rate
about 95Hz, well beyond standard 50/60Hz video refresh
rates where the eye can perceive pulsing light.
• 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.
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Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
Copyright © 2007
Rev. 1.2, 2010-08-20
WWW.Microsemi .COM
RangeMAX
™
LXMG1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
P
RODUCTION
D
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S
HEET
TM ®
HOW THE RANGEMAX WORKS (CONTINUED)
HIGHLIGHTS (CONTINUED)
• In applications with no access to a vertical sync, the
inverter burst frequency can be allowed to “free run” at
95Hz. In this non-synchronous mode, minor display
disturbances may be found under certain video conditions.
This performance is 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 ove r-voltage prev ention with brok en
or failed lamp s, and accurate lamp current regulation.
TYPICAL APPLICATION
LXMG1621-xx
12V
VSYNC
VSYNC GND
VHI1
VLO
BRITE
Figure 7- Brightness Control
VIN
SLEEP
5V
0
< 10k
2.5VDC
VHI2
P.W.
< 100µs
BRITE
LXMG1621-
xx
0 < P.W. < 100% of period
PWM Signal
from System
Figure 8 - PW M Brightness Control
4.7µF
4.99k*
4.99k
* use 4.99k for 5V PWM amplitude, 15k for 3.3V PWM
amplitude, and omit f or 2.5V PW M ampli tute.
• The brightness control may be a simple 10k potentiometer
or a voltage output DAC. A PWM signal from a micro-
controller may also be used with a suitable filter such as
shown in figure 8.
• If synchronization to the video frame rate is desired,
connect the vertical sync pulse from the system video
controller to the appropriate VSYNC input. If no video
synchronization is desired, connect VSYNC to ground.
• If you need to turn the inverter ON/OFF remotely, connect
a 3V or 5V logic signal to the SLEEP input. If remote
ON/OFF is not need ed, connec t the SLEEP input to VIN or
any other voltage greater than 2.2VDC.
• Connect VHI to high voltage wire from the lamp. Connect
VLO to the low voltag e wire (wire with thinner insulation).
If both lamp wires have heavy high voltage insulation,
connect the longest wire to VLO. VLO is connected directly
to ground (GND pin) on the inverter PCB. Always insure
a good lamp return by using a wire. Do not rely on a
chassis ground connection.
RangeMAX INVERTERS
Also available in single lamp inverters are the
LXMG1612-12-xx or LXMG1615-xx-xx, as well as the
12V dual lamp LXMG1623-xx-xx, LXMG1622-12-xx,
and the Quad output LXMG1643-12-6x versions for
multiple lamp applications .
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Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
Copyright © 2007
Rev. 1.2, 2010-08-20
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RangeMAX
™
LXMG1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
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TM ®
WIDER DIMMING APPLICATION
The following application defines techniques capable of
delivering dimming ranges in the 250:1 range. As is widely
understood, these techniques will provide general capabilities
and actual system performance will vary with panel design,
CCFTs, ambient temperature and a number of other variables
outside the control of the inverter. These me thods can be used
in conjunction with other techniques such as lamp heating and
matching.
Wide ratio (250:1) dimming can be accomplished using the
Microsemi inverter in two ways:
1. By varying the input voltage on the brightness pin as
indicated in Figure 9. Caution must be exercised when
applying negative voltage to the brightness control input.
Applying more then –300mV to any inverter input will cause
inverter malfunction (see Absolute Maximum Rating s ).
-100mV 0V 2.5V
.070
.14
0.7
7
VBRT_ADJ(V)
IOLAMP(mA)
Figure 9 – Average Lamp Current vs. VBRITE Voltage (per Lamp)
CN2
C30
U9
T1
R58
C32
C33
R59
C35
R22
R48
R62
R63 R60
R31
R57
R55R52
R54
R53
R56
R51
Q11
R50
C39
R49
R89
C37
R61
Q10
Backside of Module
U7
Figure 10 – Locating The Resistor on the LXMG1621-xx
2. By making a resistor value change on the module.
Remove R61 for maximum dimming range or increase R61
value to desired minimum dim range setting (see figure 10).
Care should be exercised since at a low enou gh dim setting the
inverter will be unable to detect that the lamp has started and
will initiate lamp strike (kickoff) voltage. This will result in
lamp flicker. For repeatable low light levels the BRITE input
DC supply must be a very clean stable voltage source, at low
dim inputs.
If you plan to completely remove R61 it is recommended tha
t
you ensure that a minimum voltage above zero remain on the
BRITE input to prevent the above flicker problem. This
minimum voltage may need to be adjusted for each individual
inverter module. If you are using a pot to control the BRITE
input then a separate trim pot on the low side would accomplish
the same goal.
Both methods discussed will provide a lower duty cycle
operation than is necessary in a 100:1 dimming application.
Careful consideration should be made with regard to display
quality at these dimming levels. At very low brightness levels,
even very small amounts of noise on the VBRITE line can cause
flicker on the display, so special care must be given to
grounding, filtering, and shielding the inverter from the digital
logic and clock signals.
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Microsemi
Analog Mixed Signal Group
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10
Copyright © 2007
Rev. 1.2, 2010-08-20
WWW.Microsemi .COM
RangeMAX
™
LXMG1621-xx
DIGITAL DIMMING DUAL LAMP CCFL INVERTER MODULE
P
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TM ®
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 test ing of all parameters. Microsemi reserves the right to change the
configuration and performance of the product and to discontinue product at any time.
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