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quad lamp panels jst bhr-03vs-1 (3-pin) & jst bhr-04vs-1 (4-pin) obsolete jst xhp-9 (9-pin) ! obsolete jst bhsr-02vs-1 (2-pin)
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
hi-brite displays desktop displays low ambient light conditions (i.e. aircraft cabins, automobile) industrial applications
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 rangemax wide range dimming, quad output inverter. the lxm1641 direct drive tm ccfl (cold cathode fluorescent lamp) inverter modules are specifically de- signed for driving lcd backlight lamps. similar to the lxm1640, the lxm1641 ex- cels in applications where critical parameters include very wide range dimmability, high ef- ficiency and reliable fail-safe design in a small form factor. these 12 volt input modules are specifically designed with desktop and indus- trial applications in mind. unlike the lxm1640 or any traditional dimming ccfl inverters, the lxm1641 pro- vides 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 dim- ming provides exceptional display readability at less than 1% of full brightness, allowing both power savings and low ambient light op- erating capability (i.e. "night readable"). rangemax digital dimming tech- nique. 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 distur- bances and interference seen with competi- tive 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
not recommended for new design t he i nfinite p ower of i nnovation LXM1641-01/-02/-03 lamp was designed specifically to ensure that no premature lamp degradation occurs (see "how rangemax works" section). failsafe feature for multiple lamp ap- plications. 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 conve- nient. direct drive technology. the module design is based on a new patented 1 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 com- mon lcd lamp configurations. additional featur es. other benefits of this new topology are fixed-frequency opera- tion and secondary-side strike-voltage regu- lation. strike-voltage regulation minimizes corona discharge in the output transformer and re- lated circuitry, providing longer life and higher reliability. all lxm1641 modules feature both open and shorted lamp protection. the lxm1641 is fully customizable (elec- tronically and mechanically) to specific cus- tomer requirements. 1 us patent numbers: 5923129 & 5930121

rev 0.9 12 /03 1 11861 w estern a venue , g arden g rove , ca. 92841, 714-898-8121, f ax : 714-893-2570 l in f inity m icroelectronics i nc .

note: for current data & package dimensions, visit our web site: http://www.linfinity.com. see lxm 1643-12-61 see lxm1643-12-62

LXM1641-01/-02/-03

rev 0.9 12/03 2 run mode v sleep (hi) sleep mode v sleep (lo) input current i sleep sleep = 5.0v
(note 1) input supply voltage (v in ) .............................................................................................................................. ......................... -0.3v to 16v output voltage, no load ........................................................................................................ ...................... internally limited to 1800v rms output current ................................................................................................................. ........................... 10.0ma rms (internally limited) output power (per lamp) ........................................................................................................ ............................................................ 6.0w input signal voltage (brite input) ............................................................................................. .......................................... -0.3v to 6.5v input signal voltage (sleep, v sync inputs) ....................................................................................................................... ............ -0.3v to v in ambient operating temperature .............................................................................................................................. . .................... . 0c to 50c 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.c.) this module has been designed to operate over a wide range of input and output conditions. however, best efficiency and perfor mance 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. input supply voltage range (functional) LXM1641-01, -02 lxm1641-03 input supply voltage LXM1641-01, -02 (fully regulated lamp current) lxm1641-03 output power (per lamp) p o brightness control input voltage range v brt adj lamp operating voltage v lamp lamp current (full brightness - per lamp) i olamp operating ambient temperature range t a parameter symbol units recommended operating conditions min. r.c. max. 81216v 10 12 14 v 91216v 10.8 12 13.2 v 45w 0.0 2.5 v 300 675 800 v rms 7.0 ma rms 070c unless otherwise specified, these specifications apply over the recommended operating conditions and 25c ambient temperature for the lxm1641. full bright lamp current 1641-01,-02 i l (max) v brt adj = 2.5v dc , sleep = high, burst duty = 100%, v in = 9v dc (per lamp) 1641-03 v brt adj = 2.5v dc , sleep = high, burst duty = 100%, v in = 12v dc minimum lamp current (per lamp) i l (min) v brt adj = 0v dc , sleep = high, burst duty = 2%, v in = 9v dc (notes 2 & 3) v brt adj = -50mv dc , sleep = high, burst duty = 0.5%, v in = 9v dc lamp start voltage v ls 0c < t a < 40c, v in 10.8v dc operating frequency f o v brt adj = 2.5v dc , sleep = high, v in = 12v dc output pin characteristics parameter symbol test conditions units lxm1641-xx min. typ. max. 6.3 7.0 7.7 ma rms 7.2 8.0 8.8 ma rms 0.14 ma rms 0.035 ma rms 1500 1800 v rms 52 57 62 khz brite input input current i brt v brt adj = 0v dc input voltage for max. lamp current v c i o (lamp) = 100% duty cycle input voltage for min. lamp current v c i o (lamp) = 2% duty cycle (note 3) i o (lamp) = 0.5% duty cycle -6 -8 -10 a dc 2.5 2.6 v dc 00v dc -50 mv dc 2.2 v in v dc -0.3 0.8 v dc 70 75 100 a dc sleep input 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.

LXM1641-01/-02/-03

3

rev 0.9 12/03 ( continued) parameter symbol test conditions units lxm1641-xx min. typ. max. power characteristics sleep current i in (min) v in = 12v dc , sleep 0.8v 550a dc note 4. the module will be functional with pulse widths much larger than 250s, but will have limited dimming. v sync characteristics logic high level v sync (hi) logic low level v sync (lo) input impedance z in pulse width (note 4) t pw input frequency f sync 4.0 6.5 v dc -0.3 1.0 v dc 60 66 75 k 25 250 s 49 150 hz

LXM1641-01/-02/-03

rev 0.9 12/03 4

6.39 (161) 1.26 (32) 0.13 ( 3.3 ) 0.338 (8.6) max. warning!! high voltage presen t at all output connectors 0.30 (7.5) ? 0.138 (3.5) grounded mounting hole - 2 plcs 1.03 (26.2) 1.05 (26.6) cn1 cn5 cn7 0.96 (24.5) cn4 cn6 0.65 (16.5) 5.04 (128) 4.25 (107.925) 1.05 (26.6) 0.060 (1.52) max. to p side bottom side cn2 cn3 conn. pin description !
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2801&$0 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 out put 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. cn4 cn7 cn2 cn3 cn1 4 3 2 1 1 2 3 n.c. 3 2 1 1 2 3 4 n.c. inverter output 2 81 v hi2 v hi1 inverter output 1 cn5 1 2 inverter output 4 inverter output 3 v hi4 v hi3 cn6 2 1

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9.84 (250) 0.30 (7.5) ? 0.138 (3.5) dia. hole 4 places (plated) 9.06 (230) cn1 0.96 (24.5) cn2 0.94 (24) 7.95 (202) cn3 3.70 (94) 1.06 (27) 0.20 (5) 2.44 (62) 1.26 (32)
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rev 0.9 12/03 8

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. figure 5 ? connectivity configuration examples desktop display ccfl lamps LXM1641-01 (1 = pin 1 designator) 1 cn7cn6 cn5cn4 cn1 1 1 1 desktop display ccfl lamps LXM1641-01 * (1 = pin 1 designator) cn3 cn2 cn1 1 1 ccfl lamps desktop display ccfl lamps LXM1641-01 (1 = pin 1 designator) 1 cn7cn6 cn5cn4 cn1 1 1 1 ccfl lamps b

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LXM1641-01/-02/-03

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rev 0.9 12/03 high voltage transformer i sense lamp 1 v sense v brite transformer driver ramp gen. comparator v sync ramp v hi1 v lo 0-2.5v dc
lamp voltage & lamp current ? burst mode operation figure 6 ? 50% burst duty cycle figure 7 ? 2% burst duty cycle figure 8 ? 2% burst duty cycle (expanded time base) figure 9 ? rangemax block diagram 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 over- shoot that can result in premature cathode wear and re- duce lamp life. & @$ ( @$ (& @$ ( @$ (& @$ ( @$

LXM1641-01/-02/-03

rev 0.9 12/03 10
(continued) highlights 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 synchr onized 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 in- verter 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 per- formance is acceptable for many applications, but synchro- nization must be used when no disturbance can be toler- ated. separate feedback loops for lamp current and open circuit volt- age regulation insure reliable strike under all operating conditions, automatic over-voltage prevention with broken or failed lamps, and accurate lamp current regulation.

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 v sync input. if no video synchronization is desired, connect v sync 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 v in or any other voltage greater than 2.2v dc . connect v hi to high voltage wire from the lamp. connect v lo to the low voltage wire (wire with thinner insulation). if both lamp wires have heavy high voltage insulation, connect the longest wire to v lo . v lo 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. figure 10 ? potentiometer brightness control figure 11 ? pwm brightness control lxm1641-xx brite v hi1 v in sleep gnd lamp 1 9v dc - 16v dc 10k 5v 0v v lo 2.5v dc v sync v sync v hi2 v hi3 v hi4 lamp 2 lamp 3 lamp 4 4.99k 4.99k* 4.7f pwm signal from system lxm1641-xx brite 0 p.w. 100% of period p.w. 100s b
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rev 0.9 12/03

the following application defines techniques capable of deliver- ing 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 tem- perature and a number of other variables outside the control of the inverter. these methods can be used in conjunction with other tech- niques such as lamp heating and matching. wide ratio (1000:1) dimming can be accomplished using the linfinity inverter in two ways: 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 applica- tion 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 figure 12 ? average lamp current vs. v brite voltage (per lamp) 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. rangemax and direct drive are trademarks of linfinity microelectronics inc. & 3& 0& 7 v brt adj (v) i olamp (ma)
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. figure 13 ? quad output stage i s lamps at these dimming levels. at very low brightness levels, even very small amounts of noise on the v brite 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.
also available in single output lxm1611-01, lxm1612-xx-xx and dual output lxm1621-xx versions for multiple lamp applications.

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