microsemi microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2002 rev. 0.5b,2003-01-16 www. microsemi . com rangemax? LXM1614-14-11 d ual d imming , e xtended temperature ccfl i nverter m odule p reliminary d atasheet integrated products description dual drive, rangemax wide range dimming, single output inverter. the lxm1614 series of direct drive? ccfl (cold cathode fluorescent lamp) inverter modules is specifically designed for driving lcd backlight lamps. although similar to the rangemax lxm1612 wide range dimming inverters, the lxm1614 family offers two separate brightness controls for lamp current amplitude and duty cycle. this innovation of dual brightness control with extended dimming, combined with microsemi?s high efficiency direct drive topology, provides the industry?s most feature rich, small fo rm factor inverter available. the wide range dimming pro- vides exceptional display readability at less than 1% of full brightness, allowing both power savings and low ambient light operating capability. dual drive dimming control. the inverters provide brightness ad- justments utilizing standard lamp current amplitude control as well as supporting microsemi?s rangemax wide range dimming technique. combining both brightness controls into a single inverter supports the ?self heating? lamp tech- nology by using a ?boost? current feature and still offers duty cycle control for low brightness operation. this controlled overdrive capability eliminates the need for traditional resistive heater wire methods to ensure light output at extremely low temperatures. the lxm1614 brightness controls support temperature monitoring with look-up table applications by accepting either a pwm input or dc voltage. large panel lamps with greater thermal inertia can also utilize this ?instant-bright? feature and minimize warm up time. (continued next page) important: for the most current data, consult microsemi ?s website: http://www.microsemi.com key features independent brightness controls for lamp current amplitude and duty cycle rangemax 1-100% wide range dimming with controlled overdrive boost on-board thermister auto- matically limits maximum lamp current supports wide input voltage range 9-16v high efficiency, single stage direct drive topology -40c to +85c ambient temperature operation output open/short circuit protection up to 2000v output voltage capability single side pcb component layout ul 609590 e175910 applications self heating and high pressure lamp technology automotive navigation, gps systems, auto pc extended cold temperature operation aircraft cabin displays low ambient light conditions requiring wide range dimming ?instant on? to full brightness for large lcd backlight panels industrial notebook and workstations product highlight controlled overdrive mode of lxm1614 inverter accelerates lamp warm-up time to provide maximum light output even in extreme temperature envi- ronments module order info p art n umber o utput c onnector i nverter m ates d irectly to p anel c onnectors LXM1614-14-11 jst sm02(8.0)b-bhs-1-tb bhr-03vs-1 l l x x m m 1 1 6 6 1 1 4 4 - - 1 1 4 4 - - 1 1 1 1
microsemi microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2002 rev. 0.5b,2003-01-16 www. microsemi . com rangemax? LXM1614-14-11 d ual d imming , e xtended temperature ccfl i nverter m odule p reliminary d atasheet integrated products description (continued) an on-board thermister monitors the inverter?s relative temperature and limits the maximum allowable lamp current. this current limit automatically protects the lamp and inverter as a function of temperature which helps control the system during boost mode. 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. a video synchronization feature allows wide ratio dimming without the display disturbances and interference seen with competitive products. the resultant ?burst drive? that energized the lamp was designed specifically to ensure that no premature lamp degradation occurs. even in overdrive boost mode, the waveform is carefully controlled to minimize the effects that are detrimental to lamp life. individual panel specifications should be referenced for specific thermal and electrical parameters. direct drive technology. the module design is based on the direct drive topology, which provides a number of cost, performance, and form factor advantages. the lxm161 4 series inverters eliminate the classic resonant inductor /capacitors and integrate the wide range dimming logic into the controller. 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 ci rcuitry, providing longer life and higher reliability. all lx m1614 modules feature both open and shorted lamp protection. the dual drive lxm1614 is fully customizable (electro nically and mechanically) to specific customer requirements. absolute maximum ratings (note 1) recommended operating conditions this module has been designed to operate ove r 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. recommended operating conditions parameter symbol min r.c. max units v in voltage range v in 9.0 16.0 v output power p o 6.0 w brightness control input voltage range v brt_adj 0.0 5.0 v boost control input voltage range v bst_adj 0.0 1.5 5.0 v lamp operating voltage v lamp 500 1000 v rms lamp current full brightness i olamp 3.5 9.0 ma rms operating ambient temperature range t a -40 85 c l l x x m m 1 1 6 6 1 1 4 4 - - 1 1 4 4 - - 1 1 1 1 input supply voltage (v in ) .............................................................................................................................. ..... -0.3v to 17v output volta ge, no load ........................................................................................................ .. internally limited to 2000v rms output current full boos t ................................................................................................... 13m a rms (<2 minutes @t a <25c) output current nominal boost ................................................................................................... .............................. 6.1ma rms output power ................................................................................................................... ...................... 10w (- 40c to 25c) output power ................................................................................................................... ......................... 6w (26c to 85c) input signal volt age (brite, boost)............................................................................................ ................... -0.3v to 5.5v input signal voltage (sleep, v sync ) ................................................................................................................. -0.3v to 5.5v a mbient operating temper ature, zero airflow..................................................................................... ..............-40c to 85c storage temperat ure ra nge ..................................................................................................... .....................-40c to 125c
microsemi microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2002 rev. 0.5b,2003-01-16 www. microsemi . com rangemax? LXM1614-14-11 d ual d imming , e xtended temperature ccfl i nverter m odule p reliminary d atasheet integrated products electrical characteristics unless otherwise specified, these specifications a pply over the recommended operating conditions and t a = -40 to 85c ambient temperature for the lmx1614-14-11. LXM1614-14-11 parameter symbol test conditions min typ max units ` output pin characteristics lamp current, full boost i l(boost5) v in =9v, brite= 5v, boost= 5v, t a per figure 9 8 8.8 9.4 ma rms lamp current, full boost i l(boost1.5) v in =9v, brite= 5v, boost= 1.5v, t a per figure 9 5 5.7 6.4 lamp current, no boost i l(boost0) v in =9v, brite= 5v, boost= 0v, t a per figure 9 3 3.8 4.6 ma rms min. average lamp current (note 2) i l(min) brite = boost = 0v .12 ma rms lamp start voltage v ls 2000 v rms operating frequency f o brite= 5v 55 65 75 khz fault timeout t fault 1.0 sec ` brite input linear dim control range v brt 0.5 4.5 v dc brite= 0v 10 a dc input current i brt brite= 5v 10 a dc input voltage for max. lamp current v brt_adj i o(lamp) = 100% duty cycle 4.5 5.0 v dc input voltage for min. lamp current v brt_adj i o(lamp) = minimum duty cycle 0 0.5 v dc ` boost input linear dim control range v bst 0.5 4.5 v dc boost= 0v 10 a dc input current i boost boost= 5v 10 a dc input voltage for max. boost current v bst_adj 4.5 5.0 v dc input voltage for min. boost current v bst_adj 0 0.5 v dc ` sleep input run mode v sleep 2.4 v in v dc off mode v sleep 0 0.8 v dc sleep=5v 110 input current ii sleep sleep=0v 0 ua ` vsync characteristics logic high level v sync (hi) 2.4 5.5 v dc logic low level v sync (lo) -0.3 0.8 v dc input impedance z in 10 k ? input frequency fv sync minimum pulse width >1us 50 145 hz output burst rate f burst v sync =0v, free run frequency 145 170 195 hz 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 full lamp current) e e l l e e c c t t r r i i c c a a l l s s
microsemi microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2002 rev. 0.5b,2003-01-16 www. microsemi . com rangemax? LXM1614-14-11 d ual d imming , e xtended temperature ccfl i nverter m odule p reliminary d atasheet integrated products functional pin description conn. pin description cn1 (molex 53261-0890) * cn1-1,2 v in main input power supply (9v to 16v) cn1-3,4 gnd power supply return cn1-5 sleep > 2.4v (backlight on), < 0.8v (backlight off), ii sleep =110a @ 5.0v cn1-6 boost lamp current amplitude control (0.5-4.5vdc) 4.5vdc gives maximum boost cn1-7 brite brightness control (0.5- 4.5v dc) 4.5vdc gives maximum lamp current cn1-8 v sync vertical synchronization input (50 < f sync < 145hz), minimum pulse width 10s cn2 (jst sm02(8.0)b-bhs-1-tb) cn2-1 v out1 high voltage ccfl lamp supply cn2-2 v out2 high voltage ccfl lamp return * lx9501 mating connector assembly available physical dimensions 5.118 in. 130mm 0.0393 in. 1mm 0.394 in. 10mm weight: 12.5(g) typ. cn-1 x w cn-2 0.905 in. 23mm 0.335 in. 8.5mm 0.118 in. 3mm .08mm 4.724 in. 120mm 0.787 in. 20mm 0.394 in. 10mm pcb tolerances 0.5mm m m e e c c h h a a n n i i c c a a l l s s
microsemi microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2002 rev. 0.5b,2003-01-16 www. microsemi . com rangemax? LXM1614-14-11 d ual d imming , e xtended temperature ccfl i nverter m odule p reliminary d atasheet integrated products how the rangemax works transformer driver high voltage transformer i sense v sense lamp v out2 v out1 v brt .5 - 4.5v dc i/v ramp gen. & pll comparator ramp + - .5 - 4.5v dc v bst v sync gain & summing temperature sense figure 1 ? rangemax simplified block diagram highlights ? integrated dual 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. ? 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. ? in applications with no access to a vertical sync, an onboard oscillator operates the inverter burst rate at about 170hz. 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 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. ? a single input will accommod ate negative and positive vertical sync pulses at any pulse width. d d e e s s c c r r i i p p t t i i o o n n
microsemi microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2002 rev. 0.5b,2003-01-16 www. microsemi . com rangemax? LXM1614-14-11 d ual d imming , e xtended temperature ccfl i nverter m odule p reliminary d atasheet integrated products how the rangemax works (continued) lamp voltage & lamp current ? burst mode operation figure 2 ? lxm1614 combines current amplitude and digital techniques the lxm1614 provides both lamp current amplitude control (boost) and a brightness control (brite) for dimming. please see following sections for dimming and amplitude boost control. to achieve extremely wide dimming ranges, rather than only using the traditional dimming technique of varying lamp current magnitude to adjust light output, rangemax inverters utilize a fixed lamp current value with a duty cycle control method. figure 3 ? 50% burst duty cycle 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 2% of its full brightness as can be seen in trace 4 of figure 5, 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 4 ? 2% burst duty cycle figure 5 ? 2% burst duty cycle (expanded time base) d d e e s s c c r r i i p p t t i i o o n n
microsemi microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 7 copyright ? 2002 rev. 0.5b,2003-01-16 www. microsemi . com rangemax? LXM1614-14-11 d ual d imming , e xtended temperature ccfl i nverter m odule p reliminary d atasheet integrated products how the rangemax works (continued) dual dimming capability as seen in the brightness vs. time graphs, the boost mode operation can improve the performance of cold cathode florescent lamps in any lcd application by reducing the time it takes to warm up lamps to their optimum operating temperature. this feature is helpful in large lcd multi-lamp monitors as well as automo tive or industrial extreme temperature applications. the ?boost? control is used to provide a timed overdrive mode to maximize light output over temperature. after a panel is characterized with a profile of the user?s application (such as desired light output as a function of ambient light and temperature), the appropriate bo ost level and duration of the boost can be set. further wide range dimming control is provided by the brite input dimming function. figure 6 - figure 7 - d d e e s s c c r r i i p p t t i i o o n n
microsemi microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 8 copyright ? 2002 rev. 0.5b,2003-01-16 www. microsemi . com rangemax? LXM1614-14-11 d ual d imming , e xtended temperature ccfl i nverter m odule p reliminary d atasheet integrated products how the rangemax works (continued) wide range dimming function dimming can be controlled by a dc voltage (like a voltage output dac) or by a pwm signal (5v logic level pwm signal from a micro controller). the pwm signal should be 400hz to 4khz, 0v to 5v, 0% to 100% duty cycle. 4.5 v 5.0 v 0.5 v 0.0 v brite brightness 100% 1% control range figure 8 - brightness as a function of the brite control (cn1-7) amplitude boost function the boost function control signal levels are the same as the dimming control. less than 0.5v provides 4ma maximum lamp current while 4.5v on boost provides ?max boost? with a max lamp current of 9ma. please note that these maximum lamp current leve ls are protected by the on- b oard thermistor which limits the maximum lamp curren t automatically as a function of te mperature as seen in figure 9. 4.5 0.5 0.0 lamp current (ma rms ) 9 iboost 4 boost mode no boost mode control rang e 5.0 v in = 9v typical curve for 5.8? panel. other panels may be different. figure 9 ? maximum lamp current as a f unction of the boost control (cn1-6) 85 c 0 25 -40 9.0 5.5 4.0 lamp current (ma rms ) temp 7.5 v in = 9v typical curve for 5.8? panel. other panels may be different. figure 10 ? maximum lamp current as a function of ambient temperature d d e e s s c c r r i i p p t t i i o o n n
microsemi microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 9 copyright ? 2002 rev. 0.5b,2003-01-16 www. microsemi . com rangemax? LXM1614-14-11 d ual d imming , e xtended temperature ccfl i nverter m odule p reliminary d atasheet integrated products typical application ? the brite/boost control may be a voltage output dac, or other voltage source as shown in figure 11. a 5v logic level pwm signal from a micro-controller may also be used as shown in figure 12. ? if synchronization to the video frame rate is desired, connect the vertical sync pulse from the system video controller to the 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 2.4v to 5v logic signal to the sleep input. if remote on/off is not needed, connect the sleep input to v in or other voltage source between 2.4v and 5v. ? connect v out1 to the high voltage supply wire from the lamp. connect v out2 to the high voltage return wire from the lamp. rangemax inverters LXM1614-14-11 9v-16v v sync sync gnd v out1 v out2 brite figure 11 - brightness control v in ccfl tube boost sleep 0v 2.5v p.w . 2.5ms to 250s brite LXM1614-14-11 0 < p.w. < 100% of period pw m signal from system figure 12 - pw m brightness control boost also available in other wide range dimming single lamp inverters lxm1612-xx-xx, lxm1615, lxm1617/8-xx- xx, dual output lxm1621-01, lxm1622-xx-xx, lxm1623/4-xx-xx and quad output lxm1641-01, lxm1643-12-6x versions for multiple lamp applications. preliminary data ? information contained in this document is pre-production data and is proprietary to microsemi. it may not be modified in any way without the express written co nsent of microsemi. product referred to herein is offered in sample form only and microsemi reserves the right to change or discontinue this proposed product at any time. a a p p p p l l i i c c a a t t i i o o n n
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