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RangeMAX
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LXM1612-05-XX
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5V HIGHLY-INTEGRATED, DIGITAL DIMMING CCFL INVERTER MODULE
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DESCRIPTION RangeMAX Wide Range Dimming, Single Output Inverter. The LXM1612-05-XX series of Direct DriveTM CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules are specifically designed for driving LCD backlight lamps. Similar to the RangeMAX LXM161101 wide range dimming inverter, the LXM1612-05-XX integrates the Direct Drive and brightness control, providing a small form factor, high-efficiency, extended dimming inverter. Unlike the LXM1610 or any traditional dimming CCFL inverters, the LXM1612-05-XX provides the designer a vastly superior display brightness range. 100:1+ brightness range is achievable with virtually any LCD display. Our wide range dimming provides exceptional display readability at less than 1% of full brightness, allowing both power savings and low ambient light operating capability (i.e. "night readable"). The LXM1612-05-XX is recommended for use in panels with low-voltage insulation on the lamp return wire. RangeMAX Digital Dimming Technique. Digital dimming provides flicker-free brightness control in any wide-range dimming application. Dimming ratios greater than 100:1 can be achieved. Incorporation of a video synchronization 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 either an external potentiometer, DC voltage source, or PWM signal. The resultant "burst drive" that energizes the lamp was designed specifically to ensure that no premature lamp degradation occurs. (See "How RangeMAX Works" Section) Input Voltage Range. The modules convert DC voltage from the system battery or AC adapter directly to highfrequency, high-voltage waves required to ignite and operate CCFL lamps. Direct Drive Technology. The module design is based on a new Direct Drive topology, which provides a number of cost and performance advantages. The LXM1612-05-XX series Direct Drive inverters eliminate the classic resonant inductor/capacitors, and integrate the wide range dimming logic into the controller, thus lowering cost, decreasing component count and allowing a substantial reduction in module size. Additional Features. Other benefits of this new topology are fixedfrequency operation and secondaryside strike-voltage regulation. Strike-voltage regulation minimizes corona discharge in the output transformer and related circuitry, providing longer life and higher reliability. All LXM1612-05-XX modules feature both open and shorted lamp protection. The LXM1612-05-XX is fully customizable (electronically and mechanically) to specific customer requirements.
K E Y F E AT U R E S
s RangeMAX Wide Range Dimming s Single 5V Input Voltage s Fully Integrated Direct Drive And Dimming Control s Single Sided PCB Layout s Easy To Use Brightness Control s MicroAmp SLEEP Mode s Output Short-Circuit Protection And Automatic Strike-Voltage Regulation s Fixed Frequency Operation
A P P L I C AT I O N S
s s s s Notebook And Sub-Notebook Computers Portable Instrumentation Desktop Displays Low Ambient Light Conditions (i.e. Aircraft Cabins, Automobile)
BENEFITS
s High Efficiency And Sleep Mode Feature Extends Computer Battery Life s Smooth, Flicker Free 1-100% Full-Range Brightness Control Gives Your Product A High Quality Image s Output Open Circuit Voltage Regulation Minimizes Corona Discharge For Long Life And High Reliability s Power Efficient, "Low Brightness" Capability Allows For Advanced Power Management s Reduced Component Count For High MTBF Performance
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
M O D U L E O R D E R I N F O R M AT I O N Inverter Mates Directly Part Number Output Connector to Panel Connectors
LXM1612-05-01 LXM1612-05-02 LXM1612-05-03
JST SM02(8.0)B-BHS-TB JST SM02B-BHSS-1-TB Honda QZ-19-A3MYL #02
BHR-03VS-1 BHSR-02VS-1 QZ-19-3F01
Copyright (c) 1999 Rev. 0.4a 7/99
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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PRODUCT DATABOOK 1996/1997
LXM1612-05-XX
5V HIGHLY-INTEGRATED, DIGITAL DIMMING CCFL INVERTER MODULE
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RangeMAX
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(Note 1)
A B S O L U T E M A X I M U M R AT I N G S
Input Supply Voltage (VIN1) .................................................................................................................................................... -0.3V to 6.5V Output Voltage, no load .............................................................................................................................. Internally Limited to 1800VRMS Output Current .............................................................................................................................................. 8.0mARMS (Internally Limited) Output Power ........................................................................................................................................................................................ 6.0W Input Signal Voltage (BRITE Input) ............................................................................................................................... -0.3V to VIN1+0.3V Input Signal Voltage (SLEEP, VSYNC Inputs) ................................................................................................................... -0.3V to VIN1+0.3V Ambient Operating Temperature, zero airflow ........................................................................................................................ 0C to 70C Storage Temperature Range ................................................................................................................................................... -40C to 85C
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 the specified terminal.
R E C O M M E N D E D O P E R A T I N G C O N D I T I O N S (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
Input Supply Voltage Range Output Power Brightness Control Input Voltage Range Lamp Operating Voltage Lamp Current (Full Brightness) Operating Ambient Temperature Range
Symbol
VIN1 PO VBRT ADJ VLAMP IOLAMP TA
Recommended Operating Conditions Min. R.C. Max.
4.5 0.0 300 0 5 3.5 2.5 600 5.8 5.5 4.0 VIN 650 70
Units
V W V VRMS mARMS C
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the recommended operating conditions and 25C ambient temperature for the LXM1612-05-XX.
Parameter Output Pin Characteristics
Full Bright Lamp Current Min. Average Lamp Current (Note 2) Lamp Start Voltage Operating Frequency
Symbol
Test Conditions
LXM1612-05-XX Min. Typ. Max.
5.8 0.12 1650 68 -728 -282 2.35
Units
IL (MAX) IL (MIN) VLS fO IBRT VBRT ADJ VBRT ADJ VSLEEP (HI) VSLEEP (LO) ISLEEP
VBRT ADJ = 2.5VDC, SLEEP = HIGH, Burst Duty=100%, VIN1 =5VDC VBRT ADJ = 0VDC, SLEEP = HIGH, Burst Duty = 2.0%, VIN1 =5VDC 0C < TA < 40C, VIN1 5.0VDC VBRT ADJ = 2.5VDC, SLEEP = HIGH, VIN1 = 5VDC VBRT ADJ = 0VDC VBRT ADJ = 2.5VDC IO (LAMP) = 100% Duty Cycle IO (LAMP) = Minimum Duty Cycle VIN1 = 4.5V VIN1 = 5.5V SLEEP = 5.0V SLEEP = 0V VIN1 = 4.5V VIN1 = 5.5V
1500 63 -685 -260 2.30 0.0 1.9 -5.0 390 0.0 1.50 -3.0 25 20 0.0
1800 73 -775 -305 2.40
mARMS mA RMS VRMS KHz ADC ADC VDC VDC VDC VDC ADC ADC VDC VDC k Hz ADC
BRITE Input
Input Current Input Voltage for Max. Lamp Current Input Voltage for Min. Lamp Current
SLEEP Input
RUN Mode SLEEP Mode Input Current 2.1 1.9 410 0.0 2.5 0.0 27 VIN1 2.0 435 0.0 5.0 1.2 29 200 10
VSYNC Characteristics
Logic High Level Logic Low Level Input Impedance Input Frequency VSYNCH (HI) VSYNCH (LO) ZIN fSYNC IIN (MIN)
Power Characteristics
Sleep Current VIN1 = 5VDC , SLEEP = 0.0V 0.5
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 5.8mARMS)
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Copyright (c) 1999 Rev. 0.4a 7/99
PRODUCT DATABOOK 1996/1997
PATENT PENDING
RangeMAX
TM
LXM1612-05-XX
5V HIGHLY-INTEGRATED, DIGITAL DIMMING CCFL INVERTER MODULE
P
RELIMINARY
D
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FUNCTIONAL PIN DESCRIPTION
Conn. Pin Description CN1 (Molex 53261-0890)
CN1-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8 CN2-1 CN2-2 SLEEP BRITE BRITE RTN VSYNC VHI VLO ON/OFF Control. (2.1V < SLEEP < VIN1 = ON, 0V < SLEEP < 0.8V = OFF, SLEEP Floating = OFF) Brightness Control (0.0V to 2.5VDC). 2.5VDC gives maximum lamp current. Analog Ground. Use for BRITE signal return ONLY. Vertical Synchronization Input. 2.5 to 5.0V Logic Level. (20Hz < fSYNC < 200Hz) High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to Ground. Connection to low side of lamp. Connect to lamp terminal with longer lead length. DO NOT connect to Ground. High voltage connection to high side of lamp. Connect to lamp terminal with shortest lead length. DO NOT connect to Ground. Connection to low side of lamp. Connect to lamp terminal with longer lead length. DO NOT connect to Ground. PHYSICAL DIMENSIONS GND Power Supply Return. VIN1 Main Input Power Supply. (4.5V VIN1 5.5V)
CN2 for LXM1612-05-01 and -02 (JST SM02(8.0)B-BHS-TB or SM02B-BHSS-1-TB)
CN2 for LXM1612-05-03 (Honda QZ-19-AMYL#02)
CN2-3 CN2-1 VHI VLO
LXM1612-05-XX All dimensions are in inches (mm).
4 .9 6 (1 2 6 ) 0 .6 6 (1 6 .7 5 ) 0 .6 3 (1 6 ) 0 .1 3 (3 .3 ) 0 .3 1 5 (8 .0 ) C N -1 0 .1 2 (3 .0 ) G r o u n d e d M o u n tin g H o le O 0 .5 (1 2 .7 ) 3 .6 4 (9 2 .5 ) 0 .1 2 (3 .0 ) O -0 1
S M 0 2 (8 .0 )B -B H S -T B (J S T )
-0 2
S M 0 2 B -B H S S -1 -T B (J S T )
-0 3
1 3
Q Z -1 9 -A 3 M Y L -0 2 ( H o n d a T s u s h in )
C N -2
1
1
W a r n in g !! H ig h V o lta g e P re s e n t
0 .0 6 0 ( 1 .5 2 ) T h ic k
Copyright (c) 1999 Rev. 0.4a 7/99
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P AT E N T P E N D I N G
PRODUCT DATABOOK 1996/1997
LXM1612-05-XX
5V HIGHLY-INTEGRATED, DIGITAL DIMMING CCFL INVERTER MODULE
P
RELIMINARY
RangeMAX
D
ATA
TM
S
HEET
HOW RANGEMAX WORKS
LAMP VOLTAGE & LAMP CURRENT -- Burst Mode Operation
FIGURE 1 -- 50% Burst Duty Cycle
FIGURE 2 -- 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 4 of Figure 3 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 3 -- 2% Burst Duty Cycle (Expanded Time Base)
VBRITE 0.0V-2.5V DC Ramp
Comparator Transformer Driver
High Voltage Transformer
VHI
Ramp Gen. VSYNC ISENSE
VSENSE VLO
FIGURE 4 -- RangeMAX Block Diagram
LAMP
Copyright (c) 1999 Rev. 0.4a 7/99
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PRODUCT DATABOOK 1996/1997
PATENT PENDING
RangeMAX
TM
LXM1612-05-XX
5V HIGHLY-INTEGRATED, DIGITAL DIMMING CCFL INVERTER MODULE
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RELIMINARY
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H O W R A N G E M A X W O R K S (continued)
HIGHLIGHTS
s 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 externally induced noise which can cause lamp flicker. s 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. s In applications with no access to a vertical sync, an onboard oscillator operates the inverter burst rate at 250Hz. 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. s A single input will accommodate negative and positive vertical sync pulses at any pulse width. s 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.
T Y P I C A L A P P L I C AT I O N
DAC or Pot 10k R 5V VSYNC BRITE
5VDC
VIN1
VHI CCFL TUBE VLO
LXM1612-05-01
BRITE RTN
0V
SLEEP
VSYNC
GND
FIGURE 5 -- Potentiometer Brightness Control
PWM Signal from System
P.W. 2ms
s The brightness control may be a voltage output DAC, digital resistor or a simple 10k potentiometer. If desired, an additional series resistor with the 10k potentiometer can be used to set a higher minimum brightness setting as shown in Figure 5. A 2.5V to 5V Logic Level PWM signal from a micro-controller may also be used as shown in Figure 5A. s If synchronization to the video framerate 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. s If you need to turn the inverter ON/OFF remotely, connect a 2.5V to 5V logic signal to the SLEEP input. If remote ON/OFF is not needed, connect the SLEEP input to VIN1 or any other voltage greater than 2.5VDC. s 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. RangeMAX INVERTERS
BRITE
LXM1612-05-01
0 P.W. 100% of period
FIGURE 5A -- PWM Brightness Control
Also available in Wide Input Voltage, Dual Output LXM1621-01 and Quad Output LXM1641-01 versions for multiple lamp applications.
RangeMAX and Direct Drive are trademarks of Linfinity Microelectronics Inc.
PRELIMINARY DATA - Information contained in this document is pre-production data, and is proprietary to LinFinity. It may not modified in any way without the express written consent of LinFinity. Product referred to herein is offered in sample form only, and Linfinity reserves the right to change or discontinue this proposed product at any time.
Copyright (c) 1999 Rev. 0.4a 7/99
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