p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2007 rev. 1.1, 2007-07-19 www. microsemi . com panelmatch ? ? 5v dual 6w ccfl programmable inverter module tm ? description the lxmg1626-05-45 is a dual 6w output direct drive? ccfl (cold cathode fluorescent lamp) inverter module specifically designed to be compatible with variety of lcd panels that have both lamps on one side of the panel and use a single common lamp return wire. lxmg1626 modules provide the designer with a vastly superior display brightness range. this brightness range is achievable with virtually any lcd display. the modules are available with a dimming input that permits brightness control from either, a dc voltage source, a pwm signal or external potentiometer. the maximum output current is externally programmable (through the input connector) at either 10ma or 12ma (5ma or 6ma per lamp). this allows the inverter to match the panel?s lamp current specifications, or it can be used to purposely drive the lamps at a lower or higher current to decrease or increase nominal brightness. the inverter also has a dedicated fault pin that indicates an open/shorted lamp condition. in addition when only one of the two lamps in the lcd fails open, the second lamp will continue to operate with a fault signal toggling to indicate the failed condition, staylit?feature. rangemax digital dimming technique provides flicker-free brightness control in any wide range typically (100:1+) dimming application. the resultant ?burst drive? that energizes the lamp is designed specifically to ensure that no premature lamp degradation occurs, while allowing significant power savings at lower dim levels. the design utilizes microsemi?s highly integrated lx1691b backlight controller to convert dc voltage from the system battery or ac adapter directly to high frequency, high-voltage waves required to ignite and operate ccfl lamps. other benefits of this new topology are stable fixed-frequency operation, secondary-side strike-voltage regulation and both open/shorted lamp protection with fault timeout. 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; 6,198,234; patents pending key features ? externally programmable maximum output current ? easy to use brightness control ? rangemax wide range dimming ? output open & short-circuit protection and automatic strike- voltage regulation and timeout ? staylit? continued operation with single open lamp failure ? fixed frequency operation ? fault output signal ? rated from -30c to 80c ? rohs compliant ? ul60950 e175910 ? applications ? dual lamp lcd?s requiring a shared common lamp return ? mates to a single jst bhr-04 vs-1 lamp connector ? industrial display controls benefits ? smooth, flicker free 1%-100% full-range brightness control ? programmable output current allows inverter to mate with a wide variety of lcd panel?s specifications ? output open circuit voltage regulation minimizes corona discharge for high reliability product highlight output hi hi u niversal d imming i nput "pwm", v dc , or p otentiometer lamp current 5 or 6ma per lamp 123 w 4 dc voltage source potentiometer pwm signal input microsemi lamp fault signal package order info p art n umber o utput c onnector i nverter m ates d irectly to p anel c onnectors lxmg1626-05-45 jst sm04(4.0)b-bhs-1-tb(lf)(sn) or yeon ho 20015wr-07a00 jst bhr-04vs-1 l l x x m m g g 1 1 6 6 2 2 6 6 - - 0 0 5 5 - - 4 4 5 5
p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2007 rev. 1.1, 2007-07-19 www. microsemi . com panelmatch ? ? 5v dual 6w ccfl programmable inverter module tm ? absolute maximum ratings (note 1) input signal voltage (v in ) .............................................................................................................................. ..........-0.3v to 6v input po wer .................................................................................................................... ..................................................... 8w output volta ge, no load ........................................................................................................ .... internally limited to 1500v rms output current (per la mp) ...................................................................................................... .....6.6ma rms (internally limited) output power .................................................................................................................. ................................................... 6w input signal voltage ( sleep input) ....................................................................................................................-0.3 v to 5.5v input signal vo ltage (bri te) ................................................................................................... ............................-0.3v to 5.5v ambient operating temper ature, zero airflow.................................................................................... .................-30c to 80c operating relative hu midity, non-c ondensin g .................................................................................... ............................ 90% storage temperat ure ra nge...................................................................................................... .........................-40c to 85c note 1: exceeding these ratings could caus e damage to the device. all voltages are wi th respect to ground. currents are posi tive into, negative out of specified terminal. recommended operating conditions (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 val ues beyond which the inverter, although operatio nal, will not function optimally. recommended operating conditions parameter symbol min r.c. max units input supply voltage range (fully regulated lamp current) 4.75 5 5.25 input supply voltage range (functional) v in 4.5 5 5.5 v output power p o 4.5 5.5 w linear brite control input voltage range v brt_adj 0 2.0 v lamp operating voltage v lamp 385 435 485 v rms 1 lamp current (full brightness, per lamp) i olamp 5.0 6.0 ma rms 2 operating ambient te mperature range t a -30 80 c 1 based on single lamp voltage measurement, use of lamps outside of this range may result is false triggering of the fault detection circuitry. 2at input voltages below 5v the inverter may not be able to output the full 6ma rms per lamp in all configurations. electrical characteristics unless otherwise specified, the following sp ecifications apply over the recommended operating condition and ambient temperature of 0 c to 60 c except where otherwise noted. lxmg1626-05-45 parameter symbol test conditions min typ max units ` output pin characteristics full bright lamp current (two lamps) i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in = 5v dc i set = ground 9 10 11 ma rms full bright lamp current (two lamps) i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in = 5v dc i set = open 11 12 13 ma rms output current lamp to lamp deviation i ll%dev v brt_adj > 2.0v dc , sleep > 2.0v, v in = 5v dc i set = open 5 % min. average lamp current i l(min) v brt_adj = 0v dc , sleep > 2.0v, v in = 5v dc i set = ground; i out = i max * sqrt of % duty cycle 1.6 ma rms lamp start voltage v ls v in > 4.5v dc 1250 1400 v rms operating frequency f o v brt_adj = 2.0v dc , sleep > 2.0v, v in = 5v 55.2 57.6 60 khz burst frequency f burst output burst frequency 215 225 235 hz fault output voltage high fault vh fault = -10ua 2.9 3.1 v fault output voltage low fault vl fault = 10ua 0.3 0.8 v e e l l e e c c t t r r i i c c a a l l s s
p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2007 rev. 1.1, 2007-07-19 www. microsemi . com panelmatch ? ? 5v dual 6w ccfl programmable inverter module tm ? electrical characteristics (continued) unless otherwise specified, the following sp ecifications apply over the recommended operating condition and ambient temperature of 0 c to 60 c except where otherwise noted. lxmg1626-05-45 parameter symbol test conditions min typ max units ` brite input v brt_adj = 0v dc -13 a dc input current i brt v brt_adj = 3v dc 1 a dc minimum input for max. lamp current v brt_adj i o(lamp) = maximum lamp current 2.0 2.05 v dc maximum input for min. lamp current v brt_adj i o(lamp) = minimum lamp current 0 v dc ` sleep bar input run mode sleep v 2.1 v in v dc sleep mode sleep v -0.3 0.8 v dc ` set input set low threshold v l 0.4 v input current i set v set 0.4v -420 a ` power characteristics sleep current i in(min) v in = 5v dc , sleep < 0.8v 0.0 12 50 a dc run current i in(run) v in = 5v dc , sleep 2.0v, i set = ground v lamp = 435v rms 1090 ma dc efficiency v in = 5v dc , sleep 2.0v, i set = ground v lamp = 435v rms 80 % functional pin description c onn p in d escription cn1 (molex 53261-0871) mates with 51021-0800 housing, 50079-8100 pins. mates with lx9501g input cable assembly cn1-1 cn1-2 v in main input power supply (4.75v < v in < 5.25v) cn1-3 cn1-4 gnd power supply return cn1-5 sleep on/off control. (0v < sleep < 0.8 = off, sleep >= 2.1v = on cn1-6 brite brightness control (0v to 2.0v dc ). 2.0v dc gives maximum lamp current. cn1-7 set set connecting this pin to ground decreas es the output current (see table 1) cn1-8 fault high impedance output that indicates lamp status, high indicates fault (see figure 2 on page 5) cn2 for lxmg1626-05-45 (jst sm03(4.0)b-bhs-1-tb(lf)(sn) or yeon ho 20015wr-07a00 ) cn2-1 v hi1 high voltage connection to high side of lamp. c onnect to lamp terminal with shortest lead length. do not connect to ground. cn2-2 v hi2 high voltage connection to high side of lamp. c onnect to lamp terminal with shortest lead length. do not connect to ground. cn2-3 nc no connect cn2-4 v lo connection to low side of lamp. connect to lamp terminal with longer lead length. do not connect to ground e e l l e e c c t t r r i i c c a a l l s s
p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2007 rev. 1.1, 2007-07-19 www. microsemi . com panelmatch ? ? 5v dual 6w ccfl programmable inverter module tm ? table 1 output current settings set 1 (pin 7) nominal output current open* 12ma ground 10ma * if driven by a logic signal it should be open collector or open drain only, not a voltage source. physical dimensions lxmg1626-05-45 cn1 16mm 0.630in. 4.0mm 0.157in. 83mm 0.2 3.27in. 30mm 1.181in. 113mm 4.45in. 1.0mm 0.0394in. 6.5mm 0.265in. max weight: 15g outside pcb tolerances 0.5mm , 4-40 recommended mounting screws u nplated m ounting h ole 3 mm 0.1 dia. 6 mm head clearance both holes g rounded m ounting h ole 3 mm 0.1 dia. cn2 w w 22mm 0.2 0.866in. warning high voltage is present at high side of transformers, their cores and the high side of the output connector, when mounting please provide at least 2 mm clearance (in all directions) on the component side of the board to any conductor all dimensions are in millimeters, inches are for reference only simplified block diagram p p a a c c k k a a g g e e d d a a t t a a
p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2007 rev. 1.1, 2007-07-19 www. microsemi . com panelmatch ? ? 5v dual 6w ccfl programmable inverter module tm ? typical application lxmg1626-05-45 5v fault ` gnd v hi2 v lo brite v in sleep set 500k dac or pot nc nc v hi1 figure 1 ? brightness control (output current set to maximum) p.w. 10s to 200s brite lxmg 1626-05-45 0< p.w. < 100 % of period pwm signal from system figure 1a ? pwm brightness control lxmg1626-05-45 fault gnd v hi2 v lo sleep set 1 brite 5v v in v hi1 lamp(s) status fault inverter operation normal operation low normal full lamp current one lamp open high normal @ ? lamp current* both lamps open high shutdown one lamp high side short to ground high normal @ ? lamp current* both lamps high side short to ground high shutdown figure 2 ? fault output operation * under some conditions the second lamp will also shutdown, this is especially true if the inverter draws an arc going open or when shorted. ? the brightness control may be a voltage output dac or other voltage source, a digi tal pot or 500k manual pot. the inverter contains an internal 215k pull-up to 3v to bias the pot. a 3.3v logic level pwm signal from a micro- controller may also be used as shown in figure 1a. ? if you need to turn the inverter on/off remotely, connect to ttl logic signal to the sleep input. ? connect v hi1 and v hi2 to high voltage wires from the lamps. connect v lo to the low voltage wire lamp return (wire with thinner insulation). never connect v lo to circuit ground as this will defeat lamp current regulation. ? use the set input to program the desired maximum output current. generally the best lamp lifetime correlates with driving the ccfl at the manufactures nominal current setting. ? typically the set pin is permanently wired to ground or intentionally left open. ho wever it can also be actively driven, using an open collector, or open drain logic signal. this will allow dynamic adjustment of the lamp current for situations where greater dim range is required, as an example in nighttime situations. in conjunction with a light sensor or other timer the panel could be set to higher brightness (maximum output current) for daytime illumination and lower brightness (minimum or typical output current) at nighttime. since the dimming ratio is a factor of both the burst duty cycle and the peak output current, by using this technique the effective dim ratio can be increased greater than what the burst duty cycle alone could provide. conversely, the set input could be used to overdrive the lamp current. of course, any possible degradation of lamp life from such practices is the user?s responsibility since not all lamps are designed to be under or overdriven. ? input connector (cn1-8) fau lt signal which is normally low will toggle high to indi cate that an output fault condition has occurred as summarized in the table to the left figure 2. fault will toggle hi gh if one or both lamps are open or short circuited. if only one lamp opens, or its high side shorts to ground then the other lamp should continue to operate with the fault signal going high. if both lamps open and/or both lamps are shorted the fault will toggle high if it is not already high and the inverter output will shutdown. also if either lo w side connection of the lamps is shorted to ground, or the lamps are shorted high side to low side, fault will go high and the inverter will shutdown. in order to restart the inverter after a fault it is necessary to toggle the sleep input or cycle the v in input supply. in fault induced shut down mode the inverter will draw about 15ma from v in supply. a a p p p p l l i i c c a a t t i i o o n n
p roduction d atasheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2007 rev. 1.1, 2007-07-19 www. microsemi . com panelmatch ? ? 5v dual 6w ccfl programmable inverter module tm ? 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. n n o o t t e e s s
|
