p rod uction d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2002 rev. 1.0a, 2006-11-13 www. microsemi . com panelmatch ? 12v 6w ccfl programmable inverter module tm ? description the lxmg1618-12-6x is a single output 6w direct drive? ccfl (cold cathode fluorescent lamp) inverter module specifically designed for driving lcd backlight lamps. it is ideal for driving typical 12.1? to 15? panels. the maximum output current is externally programmable over a range of 5 to 8ma in 1ma steps to allow the inverter to properly match to a wide array of lcd panel lamp current specifications. the modules are include a dimming input that permits brightness control from either a dc voltage source, a pwm signal or an external potentiometer. lxmg1618 modules unlike the lxmg1617 series does not provide wide range ?burst? mode dimming, rather dimming is provided by amplitude control of the output current waveform, this limits the potential dim range to typically less than 5:1. for applications not requiring wide range dimming, amplitude control results in lower ripple on the input supply and reduced potential transient noise generation. many stn type panels are particularly well suited for current amplitude dimming. the modules convert a dc voltage from the system battery or ac adapter directly to high frequency, high-voltage waves required to ignite and operate ccfl lamps. a 5v input inverter is also available (lxmg1618-05-6x). the inverter?s design is based on microsemi?s new lx1689 backlight controller, which provides a number of cost and performance advantages due to the controller?s high level of integration. other benefits of this new topology are stable fixed-frequency operation, secondary-side strike-voltage regulation and both open and 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 ? output short-circuit protection and automatic strike-voltage regulation and timeout ? analog current amplitude dimming method ? fixed frequency operation ? rated from -20 to 70c ? ul60950 e175910 ? rohs compliant applications ? notebook computers ? portable instrumentation ? desktop displays ? industrial display controls ? stn topology lcd panels benefits ? compact, low profile design ? mates to wide variety of lcd panels ? output open circuit voltage regulation minimizes corona discharge for high reliability product highlight 1 2 3 w u niversal d imming i nput " pwm ", v dc , or p otentiometer s electable m aximum o uput c urrent 5m a to 8m a rms dc voltage source potentiometer pwm signal package order info p art n umber o utput c onnector i nverter m ates d irectly to p anel c onnectors lxmg1618-12-61 jst sm02(8.0)b-bhs-1-tb (lf)(sn) or yeon ho 20015wr-05a00 jst bhr-03vs-1 LXMG1618-12-62 jst sm02b-bhss-1-tb (lf)(sn) or yeon ho 35001wr-02a00 jst bhsr-02vs-1 l l x x m m g g 1 1 6 6 1 1 8 8 - - 1 1 2 2 - - 6 6 x x
p rod uction d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2002 rev. 1.0a, 2006-11-13 www. microsemi . com panelmatch ? 12v 6w ccfl programmable inverter module tm ? absolute maximum ratings (note 1) input signal voltage (v in1 ).............................................................................................................................. .......-0.3v to 15v input po wer .................................................................................................................... ................................................ 8.25w output volta ge, no load ........................................................................................................ .... internally limited to 1800v rms output curr ent ................................................................................................................. ............10ma rms (internally limited) output power ................................................................................................................... ................................................ 6.0w input signal voltage ( sleep input) ..................................................................................................................... -0. 3v to v in1 input signal vo ltage (bri te) ................................................................................................... ............................-0.3v to 5.5v ambient operating temper ature, zero airflow.................................................................................... .................-20c to 70c 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 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, will not function optimally. recommended operating conditions parameter symbol min r.c. max units input supply voltage range (fully regulated lamp current) 10.8 12 13.2 input supply voltage range (functional) v in1 10.2 12 13.8 v output power p o 6.0 w linear brite control input voltage range1 v brt_adj 0.65 to 0.9 2.0 v lamp operating voltage v lamp 545 640 735* v rms lamp current (full brightness) i olamp 5 8 ma rms operating ambient te mperature range t a -20 70 c 1 the minimum v brt adj voltage depends on the panel characteristics, depending on the panel it can vary from 0.65v to 0.9v * total output power must not exceed 6w. higher voltage lamps may require maximum output current to be set lower than 8ma rms electrical characteristics unless otherwise specified, the following specifications apply ov er the recommended operating condition and ambient temperature of 25 c except where otherwise noted. lxmg1618-12-6x parameter symbol test conditions min typ max units ` output pin characteristics full bright lamp current i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 12v dc i set1 = ground, i set2 = ground 4.4 5 5.6 ma rms full bright lamp current i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 12v dc i set1 = ground, i set2 = open 5.4 6 6.6 ma rms full bright lamp current i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 12v dc i set1 = open, i set2 = ground 6.4 7 7.6 ma rms full bright lamp current i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 12v dc i set1 = open, i set2 = open 7.4 8 8.6 ma rms min. average lamp current i l(min) v brt_adj = 0.65v dc , sleep > 2.0v, v in1 = 12v dc i set1 = i set2 = ground 1.5 * ma rms lamp start voltage v ls -20c < t a < 70c, v in1 > 10.8v dc 1400 1650 v rms operating frequency f o v brt_adj = 2.5v dc , sleep > 2.0v, v in1 = 12v 57 60 63 khz * the inverter is capable of a lower output current than may be recommended by the panel manufacturer. it is the user?s respon sibility to set the minimum brightness (brite) input at or abov e the panel specification for minimum current. e e l l e e c c t t r r i i c c a a l l s s
p rod uction d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2002 rev. 1.0a, 2006-11-13 www. microsemi . com panelmatch ? 12v 6w ccfl programmable inverter module tm ? electrical characteristics (continued) unless otherwise specified, the following specifications apply ov er the recommended operating condition and ambient temperature of 25 c except where otherwise noted. lxmg1618-12-6x parameter symbol test conditions min typ max units ` brite input v brt_adj = 0v dc -300 a dc input current i brt v brt_adj = 3v dc 50 a dc minimum input for max. lamp current v brt_adj i o(lamp) = maximum lamp current 2.0 2.05 v dc minimum input for min. lamp current v brt_adj i o(lamp) = minimum lamp current 0.65 v dc ` sleep input run mode sleep v 2.0 5 v dc sleep mode sleep v -0.3 0.8 v dc ` set 1,2 input set 1,2 low threshold v l 0.4 v input current i set v set 0.4v -300 a ` power characteristics sleep current i in(min) v in1 = 12v dc , sleep < 0.8v 0.0 8 20 a dc run current i run v in1 = 12v dc , sleep 2.0v, i set1 = open i set2 = ground, v lamp = 640v rms 428 ma dc efficiency v in1 = 12v dc , sleep 2.0v, i set1 = open i set2 = ground, v lamp = 640v rms 88 % * the inverter is capable of a lower output current than may be re commended by the panel manufacturer. it is the user?s respon sibility to set the minimum brightness (brite) input at or above the panel specification for minimum current. this is likely greater than the 0.65v minimum input. 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 in1 main input power supply (10.8v < v in1 < 13.2v) 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 (0.65v to 2.0v dc ). 2.0v dc gives maximum lamp current. cn1-7 set 1 set 1 msb connecting this pin to ground decreases the output current 2 ma (see table 1) cn1-8 set 2 set 2 lsb connecting this pin to ground decreases the output current 1 ma (see table 1) cn2 for lxmg1618-12-61 and -62 (jst sm02(8.0)b-bhs-1-tb (lf)(sn) | ye on ho 20015wr-05a00 or sm02b-bhss-1-tb (lf)(sn) | yeon ho 35001wr-02a00) 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 rod uction d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2002 rev. 1.0a, 2006-11-13 www. microsemi . com panelmatch ? 12v 6w ccfl programmable inverter module tm ? table 1 output current settings set 1 (pin 7) set 2 (pin 8) nominal output current open* open* 8.0ma open* ground 7.0ma ground open* 6.0ma ground ground 5.0ma * if driven by a logic signal it should be open co llector or open drain onl y, not a voltage source. physical dimensions lxmg1618-12-6x 1.0mm 0.0394in. weight: (9g) typ . 7.5mm max 0.295in. warning high voltage present at high side of transformer and output connector 100mm 3.94in. g rounded m ounting h ole 2.44mm ?.08 dia . cn1 cn2 11mm 0.433in. 3.5mm 0.138in. 16mm 0.63in. 85mm 3.35in 12.5mm 0.492in x x m ounting h ole 2.44mm ?.08 dia . pcb tolerances ? 0.2mm , m2 or 2-56 recommended mounting screws 74mm ?0.2mm 2.91in all dimensions are in millimeters, inches for reference only simplified block diagram ramp gen transformer driver 0.65 - 2v dc + - lamp v lo v hi comparator ramp v brite set 1 high voltage transformer i sense ov sense set 2 +3v 10k 10k +3v +3v v in1 oc sense 10k controller p p a a c c k k a a g g e e d d a a t t a a
p rod uction d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2002 rev. 1.0a, 2006-11-13 www. microsemi . com panelmatch ? 12v 6w ccfl programmable inverter module tm ? typical application lxmg1618-12-6x 12v set 2 gnd v hi v lo brite v in1 sleep set 1 0.65v to 2.0v 2.7k 20k dac or pot ccfl tube nc nc figure 1 ? brightness control (output current set to maximum) p.w. 10s to 125s brite lxmg1618-12-6x ~26 < p.w. < 100% of period pwm signal from system figure 1a ? pwm brightness control lxmg1618-12-6x set 2 gnd v hi v lo sleep set 1 ccfl tube brite 12v v in1 l l 5.0ma rms l h 6.0ma rms h l 7.0ma rms h h 8.0ma 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 di gital pot or 20k manual pot. the inverter contains an intern al 10k pull-up to 3v to bias the pot add a 2.7k resistor to set the lower threshold voltage. 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 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 insu lation, 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 curre nt. using these two pins in combination allows the inverter to match a wide variety of panels from different manufac tures. generally the best lamp lifetime correlates with driving the ccfl at the manufactures 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 th em is all that is needed to set the output current, they can also be actively set. using a 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 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 ty pical output current) at nighttime. since the dim ratio is a factor the peak output current, using this technique th e effective dim ratio can be increased. conversely the se t inputs could 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 users responsibility as 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 for several seconds. after about 2 to 4 seconds without success the inverter will shutdown. in order to restart the inverter it is necessary to toggle the sleep input or cycle the v in1 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 rod uction d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2002 rev. 1.0a, 2006-11-13 www. microsemi . com panelmatch ? 12v 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
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