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Not Recommended For New Design
RangeMAXTM
TM (R)
LXMG1611-01
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
DESCRIPTION RangeMAXTM Wide Range Dimming, Single Output Inverter. The LXMG1611 series of Direct DriveTM CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules are specifically designed for driving LCD backlight lamps. Similar to the LXM1610, the LXMG1611 excels in applications where critical parameters include very wide range dimmability, high efficiency and reliable fail-safe design in a small form factor. Unlike the LXM1610 or any traditional dimming CCFL inverters, the LXMG1611 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 LXMG1611 is recommended for use in panels with low-voltage insulation on the lamp return wire. RangeMAXTM Digital Dimming Technique. Digital dimming provides flicker free brightness control in any widerange 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 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 "How RangeMAXTM Works" Section) Wide Input Voltage Range. The modules convert unregulated DC voltage from the system battery or AC adapter directly to high frequency, 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 LXMG1611-01 series Direct DriveTM inverters eliminate the classic resonant inductor and capacitors, thus reducing cost and allowing a 30% reduction in module size. 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 LXMG1611 modules feature both open and shorted lamp protection. The LXMG1611 is fully customizable (electronically and mechanically) to specific customer requirements.
KEY FEATURES
RangeMAXTM Wide Range Dimming 8V to 18V Input Voltage Range 30% Smaller Than CS-ZVS Models Easy to Use Brightness Control MicroAmp SLEEP Mode Output Short-Circuit Protection and Automatic Strike-Voltage Regulation 7.3mm Maximum Module Height, 16mm Module Width Fixed Frequency Operation RoHS Compliant UL 60950 E175910
APPLICATIONS
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Notebook and Sub-Notebook Computers Portable Instrumentation Desktop Displays Low Ambient Light Conditions (i.e. Aircraft Cabins, Automobile)
BENEFITS High Efficiency and Sleep mode Feature Extends Computer Battery Life Smooth, Flicker Free 1-100% FullRange Brightness Control Gives 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
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
RangeMAXTM vs. Analog Dimming
5 Power Used (Watts) 4 3 2 1
Standard Analog Dimming Inverter
Microsemi's RangeMAXTM
0
30
45
60
75
90
105
RangeMAXTM technology allows the designer to operate in a lower "brightness" and therefore at lower "power consumption" than can be reached using traditional analog dimming inverters. Dotted line indicates area where panel variations and parasitics will impact minimum light level with analog dimming. Data presented for a RangeMAXTM inverter driving a 13.3" LCD with a 1.2 Nit to 120 Nit brightness range. The minimum power levels were 0.4 watts (RangeMAXTM) vs. 2.1 watts (analog dimming) for a power consumption savings of 1.7 watts.
LXMG1611-01 LXMG1611-01
Light Output (Nits)
PACKAGE ORDER INFO
LXMG1611-01
Copyright (c) 1999 Rev. 1.0b, 2006-11-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Not Recommended For New Design
RangeMAXTM
TM (R)
LXMG1611-01
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
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Input Supply Voltage (VIN).....................................................................................................................................................-0.3V to 18V Output Voltage, no load ..............................................................................................................................Internally Limited to 1800VRMS Output Current ..............................................................................................................................................10mARMS (Internally Limited) Output Power .......................................................................................................................................................................................... 6W Input Signal Voltage (BRITE Input) .......................................................................................................................................-0.3V to 6.5V Input Signal Voltage ( SLEEP , VSYNC(-), VSYNC(+) Inputs) ........................................................................................................ -0.3V to VIN Ambient Operating Temperature Range ................................................................................................................................... 0C to 70C Storage Temperature Range .................................................................................................................................................-40C to +85C
Note: 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, bet 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 function optimally.
Parameter
Input Supply Voltage Range (Functional) Input Supply Voltage (Fully Regulated Lamp Current) Output Power Brightness Control Input Voltage Range Lamp Operating Voltage Lamp Current (Full Brightness) Operating Ambient Temperature Range
Symbol
VIN PO VBRT ADJ VLAMP IOLAMP TA
LXMG1611-01 Min R.C. Max
8 9 0 300 0 12 12 4 675 7 18 16 5 2.5 800 70
Units
V 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 LXMG1611.
Parameter
OUTPUT PIN CHARACTERISTICS Full Bright Lamp Current Minimum Lamp Current (Note 2) Lamp Start Voltage Operating Frequency BRITE INPUT Input Current Input Voltage for Max. Lamp Current Input Voltage for Min. Lamp Current
Symbol
Test Conditions
VBRT ADJ = 2.5VDC, SLEEP = HIGH, Burst Duty = 100%, VIN = 9VDC VBRT ADJ = 0VDC, SLEEP = HIGH, Burst Duty = 2%, VIN = 9VDC 0C < TA < 40C, VIN > 7VDC VBRT ADJ = 2.5VDC, SLEEP = HIGH, VIN = 12VDC VBRT ADJ = 0VDC IO(LAMP) = 100% Duty Cycle IO(LAMP) = Minimum Duty Cycle
LXMG1611-01 Min Typ Max
6.3 7.0 0.14 1500 52 -10 57 -12 2.5 0 1800 62 -14 2.6 0 VIN 0.8 7.7
Units
IL(MAX) IL(MIN) VLS fO IBRT VC VC
V SLEEP (HI) V SLEEP (LO)
mARMS mARMS VRMS kHz ADC VDC VDC VDC VDC
SLEEP INPUT RUN Mode SLEEP Mode
2.2 -0.3
PACKAGE DATA PACKAGE DATA
ISLEEP Input Current SLEEP = 5V VSYNC(-) / VSYNC(+) CHARACTERISTICS Logic High Level VSYNCH(HI) 4.0 Logic Low Level VSYNCH(LO) -0.3 Input Impedance ZIN 60 Pulse Width (Note 3) tPW 25 Input Frequency fSYNC 49 POWER CHARACTERISTICS Sleep Current IIN(MIN) VIN = 15VDC, SLEEP < 0.8V Note: 2. Minimum lamp current required to maintain even light output may vary with display panel. 3. The module will be functional with pulse widths much larger than 250s, but will have limited dimming.
Copyright (c) 1999 Rev. 1.0b, 2006-11-10
120
180 6.5 1.0 75 250 150 50
ADC VDC VDC k s Hz ADC
66
10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Not Recommended For New Design
RangeMAXTM
TM (R)
LXMG1611-01
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
FUNCTIONAL PIN DESCRIPTION
WWW .Microsemi .C OM
Conn. CN1 CN1-1 CN1-2 CN1-3 CN1-4 CN1-5 CN1-6 CN1-7 CN1-8 CN2 CN2-1 CN2-2
Pin VIN GND
SLEEP
Description Input Power Supply (8V < VIN < 18V). Power Supply Return. ON/OFF Control. (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF) Vertical Synchronization Input, negative going Vertical Synchronization Input, positive going
25s < tPW < 250s, 49Hz < fSYNC < 150Hz
VSYNC(-) VSYNC(+) VHI VLO
High Voltage connection to high side of lamp. Connect to lamp 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
100mm (3.93in.) 60mm (2.36in.) 52.25mm (2.06in.) 30mm (1.20in.)
16mm
(0.64in.)
CN1
3.85mm (0.15in.) O 2.95mm (0.116in.) Grounded Mounting Hole
CN2
7.3mm (0.287in.)
Warning!! High Voltage Present
0.79mm (0.031in.)
All dimensions are in millimeters, inches are for reference only.
BLOCK DIAGRAM BLOCK DIAGRAM
Connectors: CN1 CN2 Molex 53261-0871 JST SM02(8.0)B-BHS-1-TB
Or
Recommended Mate Pins: 50079-8100*, Housing: 51021-0800
*Loose (-8000, Chain) Recommended #26 AWG wiring
Yeon Ho 20015WR-05A00
Pins: 5BH-001T-P0.5, Housing: BHR-03VS-1
Copyright (c) 1999 Rev. 1.0b, 2006-11-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
Not Recommended For New Design
RangeMAXTM
TM (R)
LXMG1611-01
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
HOW RANGEMAXTM WORKS
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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, RangeMAXTM 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.
Comparator + 0 - 2.5VDC Ramp -
Figure 3 - 2% Burst Duty Cycle (Expanded Time Base)
High Voltage Transformer
VBRITE
VHI
Transformer Driver
LAMP
Ramp Gen
VSYNC(-) VSYNC(+)
VSENSE ISENSE
VLO
Figure 4 - RangeMAXTM Block Diagram
APPLICATIONS APPLICATIONS
Copyright (c) 1999 Rev. 1.0b, 2006-11-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
Not Recommended For New Design
RangeMAXTM
TM (R)
LXMG1611-01
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
HOW RANGEMAXTM WORKS (CONTINUED) On-board 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. An on-board oscillator operates the inverter BURST rate above 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. 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 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 inputs are provided for negative and positive vertical sync pulses so external inversion is not needed. 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.
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TYPICAL APPLICAITON
2.5VDC
10K
9-18VDC VIN
BRITE
VHI
LXMG1611-01
0V 5V SLEEP VSYNC(-) VSYNC(+) GND VLO
CCFL LAMP
VSYNC(-) VSYNC(+)
Figure 5 - Potentiometer Brightness Control
PWM Signal from System
P.W. 100s
The brightness control may be a simple 10k potentiometer or a voltage output DAC. A PWM signal from a microcontroller may also be used with a suitable filter such as shown in Figure 5A. If synchronization to the video framerate is desired, connect the vertical sync pulse from the system video controller to the appropriate VSYNC input. If the pulse is ), connect it to VSYNC(-). If negative going ( positive going ( ), connect it to VSYNC(+). If no video synchronization is desired, leave both VSYNC(-) and VSYNC(+) floating. 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 needed, connect 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 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.
4.99k
BRITE
4.99k* 4.7F
LXMG1611-01
0 P.W. 100% of Period
* Use 4.99k for 5V PWM amplitude, 15k for 3.3V PWM amplitude, and omit for 2.5V PWM amplitude.
Figure 5a - PWM Brightness Control
APPLICATIONS APPLICATIONS
RangeMAXTM Inverters
Also available in Dual Output LXMG1621-01 and Quad Output LXMG164312-6x versions for multiple lamp applications.
Copyright (c) 1999 Rev. 1.0b, 2006-11-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
Not Recommended For New Design
RangeMAXTM
TM (R)
LXMG1611-01
Digital Dimming CCFL Inverter Module
PRODUCTION DATA SHEET
NOTES
WWW .Microsemi .C OM
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 (c) 1999 Rev. 1.0b, 2006-11-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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