RangeMAX TM LXM1641-01/-02/-03 D IGITAL D IMMING Q UAD L AMP CCFL I NVERTER M ODULE T H E I N F I N I T E P O W E R O F I N N O VA T I O N P D R E L I M I N A R Y DESCRIPTION RangeMAX Wide Range Dimming, Quad Output Inverter. The LXM1641 Direct DriveTM CCFL (Cold Cathode Fluorescent Lamp) Inverter Modules are specifically designed for driving LCD backlight lamps. Similar to the LXM1640, the LXM1641 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 input modules are specifically designed with desktop and industrial applications in mind. Unlike the LXM1640 or any traditional dimming CCFL inverters, the LXM1641 provides the designer a vastly superior display brightness range. 1000:1+ brightness range is achievable with a standard LCD display (see Application Section). 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"). RangeMAX Digital Dimming Technique. Digital dimming provides flicker-free brightness control in any wide-range dimming application. Dimming ratios greater than 1000:1 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 S H E E T K E Y F E AT U R E S lamp was designed specifically to ensure that no premature lamp degradation occurs (see "How RangeMAX Works" Section). Failsafe Feature For Multiple Lamp Applications. Our multi-output inverters are designed to keep your application operating at near normal brightness in the event that a lamp fails. This allows the display to remain "on-line" until lamp replacement is convenient. Direct Drive Technology. The module design is based on a new patented1 Direct Drive topology, which provides a number of cost and performance advantages. The LXM1641-xx Direct Drive inverters eliminate the classic resonant inductor and capacitors, thus reducing cost and allowing a substantial reduction in module size. Universal Connector Configuration. Linfinity's multiple lamp inverters include a built in connector array for the most common LCD lamp configurations. 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 LXM1641 modules feature both open and shorted lamp protection. The LXM1641 is fully customizable (electronically and mechanically) to specific customer requirements. 1 A T A ■ ■ ■ ■ ■ ■ 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 A P P L I C AT I O N S ■ 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 US Patent Numbers: 5923129 & 5930121 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 Application to Panel Connectors Copyright © 1999 Rev. 0.7 12/99 LXM1641-01 Quad Lamp Panels JST BHR-03VS-1 (3-pin) & JST BHR-04VS-1 (4-pin) LXM1641-02 Sharp 18.1" Panel JST XHP-9 (9-pin) LXM1641-03 LG Electronics 18.1" Panel JST BHSR-02VS-1 (2-pin) LINFINITY MICROELECTRONICS INC. 11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570 1 PRODUCT DATABOOK 1996/1997 RangeMAX TM LXM1641-01/-02/-03 D IGITAL D IMMING Q UAD L AMP CCFL I NVERTER M ODULE P R E L I M I N A R Y D A T A S H E E T A B S O L U T E M A X I M U M R AT I N G S (Note 1) Input Supply Voltage (VIN) ....................................................................................................................................................... -0.3V to 16V Output Voltage, no load .............................................................................................................................. Internally Limited to 1800VRMS Output Current ............................................................................................................................................ 10.0mARMS (Internally Limited) Output Power (per Lamp) .................................................................................................................................................................... 6.0W Input Signal Voltage (BRITE Input) ....................................................................................................................................... -0.3V to 6.5V Input Signal Voltage (SLEEP, VSYNC Inputs) ................................................................................................................................... -0.3V to VIN Ambient Operating Temperature .................................................................................................................................................... 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 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 Symbol Input Supply Voltage Range (Functional) LXM1641-01, -02 LXM1641-03 LXM1641-01, -02 LXM1641-03 Input Supply Voltage (Fully Regulated Lamp Current) Output Power (per Lamp) Brightness Control Input Voltage Range Lamp Operating Voltage Lamp Current (Full Brightness - per Lamp) Operating Ambient Temperature Range Recommended Operating Conditions Min. R.C. Max. 8 10 9 10.8 PO VBRT ADJ VLAMP IOLAMP TA 0.0 300 12 12 12 12 4 Units 16 14 16 13.2 5 2.5 800 675 7.0 0 V V V V W V VRMS mARMS °C 70 ELECTRICAL CHARACTERISTICS Unless otherwise specified, these specifications apply over the recommended operating conditions and 25°C ambient temperature for the LXM1641. Parameter Symbol Test Conditions LXM1641-xx Min. Typ. Max. Units Output Pin Characteristics Full Bright Lamp Current 1641-01,-02 (per Lamp) 1641-03 Minimum Lamp Current (per Lamp) (Notes 2 & 3) Lamp Start Voltage Operating Frequency IL (MAX) IL (MIN) VLS fO VBRT ADJ = 2.5VDC, SLEEP = HIGH, Burst Duty = 100%, VIN = 9VDC VBRT ADJ = 2.5VDC, SLEEP = HIGH, Burst Duty = 100%, VIN = 12VDC VBRT ADJ = 0VDC, SLEEP = HIGH, Burst Duty = 2%, VIN = 9VDC VBRT ADJ = -50mVDC, SLEEP = HIGH, Burst Duty = 0.5%, VIN = 9VDC 0°C < TA < 40°C, VIN ≥ 10.8VDC VBRT ADJ = 2.5VDC, SLEEP = HIGH, VIN = 12VDC 6.3 7.2 1500 52 7.0 8.0 0.14 0.035 57 7.7 8.8 1800 62 mA RMS mA RMS mA RMS mA RMS VRMS KHz BRITE Input Input Current Input Voltage for Max. Lamp Current Input Voltage for Min. Lamp Current (Note 3) IBRT VC VC VBRT ADJ = 0VDC IO (LAMP) = 100% Duty Cycle IO (LAMP) = 2% Duty Cycle IO (LAMP) = 0.5% Duty Cycle -6 -8 2.5 0 -50 -10 2.6 0 µADC VDC VDC mVDC VIN 0.8 100 VDC VDC µADC SLEEP Input RUN Mode SLEEP Mode Input Current VSLEEP (HI) VSLEEP (LO) ISLEEP SLEEP = 5.0V 2.2 -0.3 70 75 Note 2. Minimum lamp current required to maintain even light output may vary with display panel. 3. See 1000:1 Dimming Application section for details. 2 Copyright © 1999 Rev. 0.7 12/99 PRODUCT DATABOOK 1996/1997 RangeMAX TM LXM1641-01/-02/-03 D IGITAL D IMMING Q UAD L AMP CCFL I NVERTER M ODULE P R E L I M I N A R Y D A T A S H E E T ELECTRICAL CHARACTERISTICS Parameter Symbol ( Continued) Test Conditions LXM1641-xx Min. Typ. Max. Units VSYNC Characteristics Logic High Level Logic Low Level Input Impedance Pulse Width (Note 4) Input Frequency VSYNC (HI) VSYNC (LO) ZIN tPW fSYNC 4.0 -0.3 60 25 49 66 6.5 1.0 75 250 150 VDC VDC kΩ µs Hz 5 50 µADC Power Characteristics Sleep Current IIN (MIN) VIN = 12V DC , SLEEP ≤ 0.8V Note 4. The module will be functional with pulse widths much larger than 250µs, but will have limited dimming. Copyright © 1999 Rev. 0.7 12/99 3 PRODUCT DATABOOK 1996/1997 RangeMAX TM LXM1641-01/-02/-03 D IGITAL D IMMING Q UAD L AMP CCFL I NVERTER M ODULE P R E L I M I N A R Y D A T A S H E E T PHYSICAL DIMENSIONS LXM1641-01 All dimensions are in inches (mm) 6.39 (161) 0.65 (16.5) CN7 CN1 CN5 0.30 (7.5) CN6 CN4 5.04 (128) Top Side 1.03 (26.2) 1.05 (26.6) 1.05 (26.6) 0.96 (24.5) Ø 0.138 (3.5) Grounded Mounting Hole - 2 plcs 4.25 (107.925) CN2 CN3 Bottom Side 0.338 (8.6) Max. 0.13 (3.3) 1.26 (32) Warning!! High Voltage Present At All Output Connectors 0.060 (1.52) max. FIGURE 1 — LXM1641-01 Physical Dimensions Functional Pin Description Conn. CN1 Pin Description CN1-1, 2 VIN Input Power Supply. (8V ≤ VIN ≤ 16V) CN1-3, 4 GND Power Supply Return. 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 syncronization input. 49Hz < fSYNC < 150Hz CN2 thru CN7: Refer to Figure 2 4 Copyright © 1999 Rev. 0.7 12/99 PRODUCT DATABOOK 1996/1997 RangeMAX TM LXM1641-01/-02/-03 D IGITAL D IMMING Q UAD L AMP CCFL I NVERTER M ODULE P R E L I M I N A R Y D A T A S H E E T C O N N E C T O R S C H E M AT I C CN1 Inverter VHI2 Output 2 8 Inverter VHI1 Output 1 1 2 1 CN2 Inverter Output 4 VHI3 Inverter Output 3 2 2 4 3 VHI4 1 N.C. 3 CN4 1 CN6 3 2 2 CN5 1 1 2 N.C. 3 4 CN3 1 CN7 FIGURE 2 — LXM1641-01 Connector Schematic Note: CN2 and CN3 (shown with dashed lines) are located on the opposite side of the PCB from CN1, CN4, CN5, CN6, and CN7. Their pin numbers are shown as viewed looking through the printed circuit board. Connectors: CN1 = MOLEX 53261-0890 Mates With: Pins: 50079-8100*, Housing: 51021-0800 CN2, CN3 = JST SM04(4.0)B-BHS-1-TB JST BHR-04VS-1 CN4, CN7 = JST SM03(4.0)B-BHS-1-TB JST BHR-03VS-1 CN5, CN6 = JST SM02(8.0)B-BHS-1-TB JST BHR-03VS-1 * Loose (-8000, Chain) Recommended #26 AWG wiring Connection Rules 1. Always install FOUR (4) lamps. Operating with fewer lamps may overdrive lamp current at maximum brightness settings. 2. Verify lamp wiring before connecting lamps to the inverter module. Connecting multiple lamps to one of the four inverter output circuits will result in reduced brightness. The LXM1641-01 module connectors are wired per industry standard. The lamp hot wires (high voltage wires) are always on pin 1 or 2, and the cold wire (low voltage wire) is always on pin 3 or 4. Copyright © 1999 Rev. 0.7 12/99 5 PRODUCT DATABOOK 1996/1997 RangeMAX TM LXM1641-01/-02/-03 D IGITAL D IMMING Q UAD L AMP CCFL I NVERTER M ODULE P R E L I M I N A R Y D A T A S H E E T PHYSICAL DIMENSIONS LXM1641-02 For Direct Connection to Sharp: LQ181E1DG01 (18.1" TFT, 4 lamp) 9.84 (250) 0.94 (24) 7.95 (202) 3.70 (94) 2.44 (62) 1.06 (27) Ø 0.138 (3.5) Dia. Hole 4 Places (plated) CN1 1.26 (32) CN3 0.30 (7.5) CN2 9.06 (230) 0.20 (5) 0.96 (24.5) FIGURE 3 — LXM1641-02 Physical Dimensions All dimensions are in inches (mm) Connectors: CN1 = MOLEX 53261-0890 CN2, CN3 = JST S9B-XH-A Mates With: Pins: 50079-8100, Housing: 51021-0800 XHP-9 Functional Pin Description 6 Connector Pin # Pin Name CN1-1, 2 CN1-3, 4 CN1-5 CN1-6 CN1-7, 8 CN2-1 CN2-2, 3 CN2-4 CN2-5, 6 CN2-7 CN2-8 CN2-9 CN3-1 CN3-2, 3 CN3-4 CN3-5, 6 CN3-7 CN3-8 CN3-9 VIN GND SLEEP BRITE VSYNC VHI1 N.C. VHI2 N.C. VLO N.C. VLO VHI3 N.C. VHI4 N.C. VLO N.C. VLO Description Input Power Supply (8V to 16V) Power Supply Return ON / OFF Control (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF Brightness Control (-0.3V to 2.5V), 2.5V gives max. lamp current Vertical Sync Input, negative going. 49Hz < fSYNC < 150Hz High-voltage connection to high side of lamp 1 No Connect High-voltage connection to high side of lamp 2 No Connect Connection to low side of lamp 2 No Connect Connection to low side of lamp 1 High-voltage connection to high side of lamp 4 No Connect High-voltage connection to high side of lamp 3 No Connect Connection to low side of lamp 3 No Connect Connection to low side of lamp 4 Copyright © 1999 Rev. 0.7 12/99 PRODUCT DATABOOK 1996/1997 RangeMAX TM LXM1641-01/-02/-03 D IGITAL D IMMING Q UAD L AMP CCFL I NVERTER M ODULE P R E L I M I N A R Y D A T A S H E E T PHYSICAL DIMENSIONS LXM1641-03 For Direct Connection to LG LM181E1 18.1" SXGA 9.84 (250) 0.94 (24) 7.95 (202) 3.70 (94) 0.30 (7.5) 2.44 (62) CN8 CN10 1.06 (27) 1.26 (32) CN1 CN9 CN11 Ø 0.138 (3.5) Dia. Hole 4 Places (plated) 0.20 (5) 0.96 (24.5) Note: Connectors CN8, CN9, CN10, and CN11 are mounted on bottom side of board. Shown looking through board. FIGURE 4 — LXM1641-03 Physical Dimensions All dimensions are in inches (mm) Connectors: CN1 = MOLEX 53261-0890 CN8, CN9, CN10, CN11 = JST SM02B-BHSS-1-TB Mates With: Pins: 50079-8100, Housing: 51021-0800 BHSR-02VS-1 Functional Pin Description Connector Pin # Pin CN1-1, 2 CN1-3, 4 CN1-5 CN1-6 CN1-7, 8 CN8-1 CN8-2 CN9-1 CN9-2 CN10-1 CN10-2 CN11-1 CN11-2 VIN GND SLEEP BRITE VSYNC VHI1 VLO VHI1 VLO VHI1 VLO VHI1 VLO Copyright © 1999 Rev. 0.7 12/99 Description Input Power Supply (10V to 14V) Power Supply Return ON / OFF Control (2.2V < SLEEP < VIN = ON, -0.3V < SLEEP < 0.8V = OFF) Brightness Control (-0.3V to 2.5V), 2.5V gives max. lamp current Vertical Sync Input, negative going. 49Hz < fSYNC < 150Hz High-voltage connection to high side of lamp 1 Connection to low side of lamp 1 High-voltage connection to high side of lamp 2 Connection to low side of lamp 2 High-voltage connection to high side of lamp 3 Connection to low side of lamp 3 High-voltage connection to high side of lamp 4 Connection to low side of lamp 4 7 PRODUCT DATABOOK 1996/1997 RangeMAX TM LXM1641-01/-02/-03 D IGITAL D IMMING Q UAD L AMP CCFL I NVERTER M ODULE P R E L I M I N A R Y D S A T A H E E T T Y P I C A L C O N N E C T I O N C O N F I G U R AT I O N S 1 These examples illustrate three typical LCD wiring configurations that are accomodated by Linfinity's unique connector array. Linfinity inverters have multiple lamp connector styles that are common to the industry, which are duplicated at both ends of the module. This permits many variations of module mounting and interconnectivity configurations. 1 CCFL Lamps CN1 LXM1641-01 (1 = Pin 1 Designator) CN6 CN7 CN4 CN5 1 1 Desktop Display 1 CCFL Lamps CN1 LXM1641-01* (1 = Pin 1 Designator) CN3 CCFL Lamps CN2 1 Desktop Display * Connectors CN2 and CN3 are on the bottom side of the inverter. View shown is looking through the board. 1 1 CCFL Lamps LXM1641-01 (1 = Pin 1 Designator) CN6 CN7 CN1 CCFL Lamps CN4 CN5 1 1 Desktop Display FIGURE 5 — Connectivity Configuration Examples 8 Copyright © 1999 Rev. 0.7 12/99 PRODUCT DATABOOK 1996/1997 RangeMAX TM LXM1641-01/-02/-03 D IGITAL D IMMING Q UAD L AMP CCFL I NVERTER M ODULE P R E L I M I N A R Y D A T A S H E E T HOW RANGEMAX WORKS LAMP VOLTAGE & LAMP CURRENT — Burst Mode Operation (770VRMS) (760VRMS) (7.6mARMS) (6.7mARMS) FIGURE 6 — 50% Burst Duty Cycle FIGURE 7 — 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 8, 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 8 — 2% Burst Duty Cycle (Expanded Time Base) High Voltage Transformer Transformer Driver Ramp Gen. VHI1 LAMP 1 Ramp VSYNC (6.7mARMS) Comparator VBRITE 0-2.5V DC (760VRMS) VSENSE ISENSE VLO FIGURE 9 — RangeMAX Block Diagram Copyright © 1999 Rev. 0.7 12/99 9 PRODUCT DATABOOK 1996/1997 RangeMAX TM LXM1641-01/-02/-03 D IGITAL D IMMING Q UAD L AMP CCFL I NVERTER M ODULE P R E L I M I N A R Y D A T A S H E E T H O W R A N G E M A X W O R K S (continued) HIGHLIGHTS ■ 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 over-voltage prevention with broken or failed lamps, and accurate lamp current regulation. ■ 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. T Y P I C A L 1 0 0 : 1 D I M M I N G A P P L I C AT I O N 9VDC- 16VDC 2.5VDC 5V 0V Lamp 1 LXM1641-xx SLEEP VSYNC GND Lamp 4 BRITE Lamp 3 £ 10k Lamp 2 VHI4 VHI3 VHI2 VHI1 VIN VLO VSYNC FIGURE 10 — Potentiometer Brightness Control PWM Signal from System P.W. 4.99k 4.7µF 4.99k* £ 100µs ■ 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 11. ■ If synchronization to the video framerate 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 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). 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. BRITE LXM1641-xx 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 11 — PWM Brightness Control 10 Copyright © 1999 Rev. 0.7 12/99 PRODUCT DATABOOK 1996/1997 RangeMAX TM LXM1641-01/-02/-03 D IGITAL D IMMING Q UAD L AMP CCFL I NVERTER M ODULE P R E L I M I N A R Y D A T A S H E E T 1 0 0 0 : 1 D I M M I N G A P P L I C AT I O N The following application defines techniques capable of delivering dimming ranges in the 250:1 and 1000:1 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 methods can be used in conjunction with other techniques such as lamp heating and matching. Wide ratio (1000:1) dimming can be accomplished using the Linfinity inverter in two ways: IOLAMP (mA) 7 .14 .070 1) By varying the input voltage on the brightness pin as indicated in Figure 12. Caution must be exercised when applying negative voltage to the brightness control input. Applying more than -300mV to any inverter input will cause inverter malfunction (see Absolute Maximum Ratings). 2) By making a resistor value change on the module. If this option is preferrable, please contact the factory for application assistance. 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 regards to display quality 0.7 -100mV 0V 2.5V VBRT ADJ (V) FIGURE 12 — Average Lamp Current vs. VBRITE Voltage (per Lamp) 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. FA I L S A F E F E AT U R E F O R M U L T I P L E L A M P O P E R AT I O N S Our multi-output inverters are designed to keep your application operating at near normal brightness in the event that a lamp fails. This allows the display to remain "on-line" until lamp replacement is convenient. Linfinity "parallels" the lamps so that if any lamps break, most of the current is added to the remaining good lamps. CCFLs will respond with more brightness for a period of time. Operating time in this mode will be a function of the lamps age but should be typically in the order of hundreds of hours. This operating characteristic can provide adequate display performance for a limited, but useful period of time. Shortening of the lamp life in this mode is typically not a concern as it is recommended that all lamps in a display be replaced at the same time. Lamps IS RangeMAX INVERTERS Also available in Single Output LXM1611-01, LXM1612-xx-xx and Dual Output LXM1621-xx versions for multiple lamp applications. FIGURE 13 — Quad Output Stage 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 © 1999 Rev. 0.7 12/99 11