p roduction d at asheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 800-877-6458, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2008 rev. 1.1, 2009-11-03 www. microsemi . com panelmatch ? 3.3v 2.2w ccfl programmable inverter module tm ? description the lxmg1618a-03-2x? is a single output 2.2w direct drive? ccfl (cold cathode fluorescent lamp) inverter module designed for driving lcd backlight lamps. it is ideal for driving typically 3.9? to 6.4? panels. the maximum output current is externally programmab le over a range of 3.5 to 5ma in 0.5ma steps (panelmatch) to allow the inverter to properly match to a wide array of lcd panel lamp current specifications. the modules include a dimming input that permits brightness control from a dc voltage source, a pwm signal or an external potentiometer. lxmg1618a modules unlike the lxmg1617a series do not provide wide range ?burst? mode dimming, rather dimming is provided by amplitude control of the output current waveform, and this limits the potential dim range to typically less than 5:1. the module converts a dc voltage from the system battery, or ac adapter directly to high frequency, high-voltage waveform required to ignite and operate ccfl lamps. a 5v input inverter is also available (lxmg1618a-05-2x). the lxmg1618a modules contain the newer highly integrated lx1691b ccfl backlight controller to provide a wider temperature range (-30c to 80c) compared to the existing solutions offered by microsemi. other benefits of the inverter?s topology include stab le fixed-frequency operation, secondary-side strike voltage regulation and both open/shorted lamp protection with fault timeout. the new lxmg1618a (?a series?) modules are designed therefore as a higher performance near drop-in replacement (see brite minimum input) for those customers and applications currently using the lxmg1618 inverters. 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 ? output short-circuit protection and automatic strike-voltage regulation and timeout ? analog current amplitude dimming method ? fixed frequency operation ? rated from -30c to 80c ? ul60950 e175910 ? rohs compliant applications ? medical instrument displays ? portable instrumentation (gps, etc.) ? industrial display controls benefits ? 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 u niversal d imming i nput "pwm", v dc , or p otentiometer dc voltage source potentiometer pwm signal s electable m aximum o uput c urrent 3.5 m a rms to 5 m a rms 1 2 3 w package order info p art n umber o utput c onnector i nverter m ates d irectly to p anel c onnectors LXMG1618A-03-21 jst sm02(8.0)b-bhs-1-tb (lf)(sn) or yeon ho 20015wr-05a00 or equivalent jst bhr-03vs-1 lxmg1618a-03-22 jst sm02b-bhss-1-tb (lf)(sn) or yeon ho 35001wr-02a00 or equivalent jst bhsr-02vs-1 l l x x m m g g 1 1 6 6 1 1 8 8 a a - - 0 0 3 3 - - 2 2 x x
p roduction d at asheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 800-877-6458, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2008 rev. 1.1, 2009-11-03 www. microsemi . com panelmatch ? 3.3v 2.2w ccfl programmable inverter module tm ? absolute maximum ratings input signal voltage (v in ) .............................................................................................................................. ..........-0.3v to 5v input po wer .................................................................................................................... .................................................. 3.0w output volta ge, no load ........................................................................................................ .... internally limited to 1300v rms output curr ent ................................................................................................................. ..............6ma rms (internally limited) output power ................................................................................................................... ................................................ 2.3w input signal voltage ( sleep input) .......................................................................................................................- 0.3v to 5v input signal vo ltage (bri te) ................................................................................................... ...............................-0.3v to 5v ambient operating temper ature, zero airflow.................................................................................... .................-30c to 80c storage temperat ure ra nge...................................................................................................... .........................-40c to 85c exceeding these ratings could cause damage to the device. all voltages are with resp ect to ground. currents are positive into , negative out of specified terminal. recommended operating conditions (r.c.) 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 val ues beyond which the inverter, although operatio nal, may not function optimally. recommended operating conditions parameter symbol min r.c. max units input supply voltage range (fully regulated lamp current) 3 3.3 3.6 input supply voltage range (functional) v in 3 4.2 v output power p o 2.2 w linear brite control input voltage range1 v brt_adj 0 2.0 v lamp operating voltage v lamp 325 380 435* v rms lamp current (full brightness) i olamp 3.5 5.0 ma rms operating ambient te mperature range t a -30 80 c 1 the brite minimum input voltage level is 0v, whereas it is 0.65v in the original lx mg1618-03-2x inverter, see application info on page 5. the minimum v brt adj voltage depends on the panel characteristics and minimum lamp current specification, depending on the panel it can vary from 0v to 0.5v *total output power must not exceed 2.2w . higher voltage lamps may require maximum output current to be set lower than 5ma rms electrical characteristics the following specifications apply over the recommended ope rating condition and ambient temperature of 0c to 60 c except where otherwise noted. lxmg1618a-03-2x parameter symbol test conditions min typ max units ` output pin characteristics full bright lamp current i l(max) v brt_adj 2.0v, sleep 2.0v, v in = 3.3v i set1 = ground, i set2 = ground 3.0 3.5 4.0 ma rms full bright lamp current i l(max) v brt_adj 2.0v, sleep 2.0v, v in = 3.3v i set1 = ground, i set2 = open 3.5 4.0 4.5 ma rms full bright lamp current i l(max) v brt_adj 2.0v, sleep 2.0v, v in = 3.3v i set1 = open, i set2 = ground 4.0 4.5 5.0 ma rms full bright lamp current i l(max) v brt_adj 2.0v, sleep 2.0v, v in = 3.3v i set1 = open, i set2 = open 4.5 5 5.5 ma rms min. average lamp current2 i l(min) v brt_adj = 0v, sleep 2.0v, v in = 3.3v i set1 = i set2 = ground 1.5 ma rms lamp start voltage v ls -30c < t a < 80c, v in > 3v 1000 1200 v rms operating frequency f o v brt_adj = 2v, sleep 2.0v, v in = 3.3v 85 90 94 khz 2 the inverter is capable of a lower output current than may be recommended by the panel manufacturer. it is the user responsibility to set the minimum brightness (brite) input at or above the panel specification for minimum lamp current . 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 at asheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 800-877-6458, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2008 rev. 1.1, 2009-11-03 www. microsemi . com panelmatch ? 3.3v 2.2w ccfl programmable inverter module tm ? electrical characteristics (continued) the following specifications apply over the recommended operating condition and ambient temperature of 0c to 60 c except where otherwise noted. lxmg1618a-03-2x parameter symbol test conditions min typ max units ` brite input v brt_adj = 0v -9 a input current i brt v brt_adj = 3v 0 a minimum input for max. lamp current v brt_adj i o(lamp) = maximum lamp current 1.8 2.0 v maximum input for min. lamp current3 v brt_adj i o(lamp) = minimum lamp current 0 v minimum pwm input frequency f brt_pwm 2 khz ` sleep bar input run mode sleep v 2.0 v sleep mode sleep v -0.3 0.8 v ` set 1,2 input set 1,2 low threshold v l 0.4 v input current i set v set = 0v -300 a ` power characteristics sleep current i in(min) v in = 3.3v, sleep 0.8v 3 10 a run current i run v in = 3.3v, sleep 2.0v, i set1 = open i set2 = ground, v lamp = 380v rms 690 ma run current ripple voltage i ripple v in = 3.3v, sleep 2.0v, i set1 = open i set2 = ground, v lamp = 380v rms 400 mvpp efficiency v in = 3.3v, sleep 2.0v, i set1 = open i set2 = ground, v lamp = 380v rms 75 % 3 the brite minimum input voltage level is 0v, whereas it is 0.65v in the original lxmg1618-03-2x inverter. functional pin description c onn p in d escription cn1 (molex 53261-0871 or equivalent) mates with 51021-0800 housing, 50079-8100 pins. mates with lx9501g input cable assembly cn1-1 cn1-2 v in main input powe r supply (3v < v in < 3.6v) cn1-3 cn1-4 gnd power supply return cn1-5 sleep on/off control. (0v < sleep 0.8 = off, sleep 2.0v = on) cn1-6 brite brightness control (0v to 2.0v ). 2.0v gives maximum lamp current. cn1-7 set 1 set 1 msb connecting this pin to ground decreases the output current ~ 1ma (see table 1) cn1-8 set 2 set 2 lsb connecting this pin to ground decreases the output current ~ 0.5ma (see table 1) cn2 for LXMG1618A-03-21 and -22 (jst sm02(8.0)b-bhs-1-tb(lf)(sn) / yeon ho 20015wr-05a00 or sm02b-bhss-1- tb(lf)(sn) / yeon ho 35001wr-02a00) or equivalent cn2-1 v hi 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 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 at asheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 800-877-6458, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2008 rev. 1.1, 2009-11-03 www. microsemi . com panelmatch ? 3.3v 2.2w ccfl programmable inverter module tm ? table 1 output current settings set 1 (pin 7) set 2 (pin 8) nominal output current open open 5.0ma open ground 4.5ma ground open 4.0ma ground ground 3.5ma * if driven by a logic signal it should be open collector or open drain only, not a voltage source. physical dimensions lxmg1618a-03-2x 0.8mm 0.1 0.0315in. weight: (5.7g) typ . 4.7mm max 0.185in. 86mm 3.39in cn1 cn2 w 11mm 0.433in. 3.5mm 0.138in. 16mm 0.63in. 71mm 2.80in 12.5mm 0.492in x pcb tolerances 0.5mm, m2 or 2-56 recommended mounting screws g rounded m ounting h ole 2.44 mm 0.08 dia. m ounting h ole 2.44 mm 0.08 dia. 60mm 0.2mm 2.36in. 9mm 0.2mm 0.354 in. r1.0 warning high voltage is present at high side of transformer, its core and the high side of the output connector, please provide at least 2 mm clearance (in all directions) on the component side of the board to any conductor when mounting all dimensions in millimeters, inches are for reference only . simplified block diagram controller & transformer driver 0 to 2v dc lamp v lo v hi v brite set 1 high voltage transformer i sense ov sense set 2 +3v 267k 10k +3v +3v v in oc sense 10k 71.5k 220nf 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 at asheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 800-877-6458, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2008 rev. 1.1, 2009-11-03 www. microsemi . com panelmatch ? 3.3v 2.2w ccfl programmable inverter module tm ? typical application lxmg1618a-03-2x 3.3v set 2 gnd v hi v lo brite v in sleep set 1 0v to 2.0v 500k dac or pot ccfl tube nc nc figure 1 ? brightness control (output current set to maximum) p.w. 10s to 500s brite lxmg1618a-03-2x 0 < p.w. < 100% of period pwm signal from system figure 1a ? pwm brightness control lxmg1618a-03-2x set 2 gnd v hi v lo sleep set 1 ccfl tube brite 3.3v v in l l 3.5ma rms l h 4.0ma rms h l 4.5ma rms h h 5.0ma rms l=gnd; h= open figure 2 ? max output current (set 1 and set 2 inputs) ? the brightness control may be a voltage output dac or other voltage source, a dig ital pot or 500k manual pot. the inverter contains effectively an internal 338k pull-up to 3v to bias the pot, if desired; add a resistor to set the lower threshold voltage above the absolute minimum dim level capability. a pwm l ogic level signal (figure 1a) may be used up to 5v; however the inverter will reach maximum current at less than 100% duty cycle. this can be calculated as approximately 2v divided by the logic high voltage level; with 3.3v logic level this corresponds to about 60% duty cycle for maximum lamp current. ? if you need to turn the inverter on/off remotely, connect to ttl logic signal to the sleep input. ? connect v hi to high voltage wire from the lamp. connect v lo to the low voltage wire (wire with thinner insulation). never connect v lo to circuit ground as this will defeat lamp current regulation. if both lamp wires have heavy high voltage insulation, connect the longest wire to v lo . this wire is typically white. ? use the set 1 and set 2 (see figure 2) inputs to select the desired maximum output current. using these two pins in combination allows the inverter to match a wide variety of panels from different manufactu rers. generally the best lamp lifetime correlates with driving the ccfl at the manufacturer?s nominal current setting. however the set 1 and set 2 inputs allow the user the flexibility to adjust the current to the maximum allowable output current to increase panel brightness at the expense of some reduced lamp life. ? although the set pins are designed such that just leaving them open or grounding them is all that is needed to set the output current, they can also be actively set. using an open collector or open drain logic signal will allow you to reduce the lamp current for situations where greater dim range is required, as an exam ple in nighttime situations. in conjunction with a light sens or or other timer the panel could be set to higher brightness (maximum output current) for daytime illumination and lower brightness (minimum or typical output cu rrent) at nighttime. since the dim ratio is a factor of the peak output current, using this technique the effective dim ratio can be increased. conversely, the set inputs coul d be used to overdrive the lamp temporarily to facilitate faster lamp warm up at initial lamp turn on. of course any possible degradation on lamp life from such practices is the user?s responsibility since not all lamps are designed to be overdriven. ? the inverter has a built-in fault timeout function. if the output is open (lamp disconnected or broken) or shorted the inverter will attempt to strike the lamp up to about one second, after which (without success) the inverter will shutdown. supply current draw in the shutdown mode is about 8ma. in order to restart the inverter it is necessary to toggle the sleep input or cycle the v in input 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 at asheet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 800-877-6458, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2008 rev. 1.1, 2009-11-03 www. microsemi . com panelmatch ? 3.3v 2.2w 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
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