p roduction 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, 2005-01-17 www. microsemi . com panelmatch ? 5v dual 4w ccfl programmable inverter module integrated products description the LXM1623-05-44 is a dual 4w output direct drive? ccfl (cold cathode fluorescent lamp) inverter module specifically designed to be compatible with the sharp lq104s1dg21 / 51 10.4?, lq121s1dg31 / 41 12.1? as well as the samsung ltm121si-t01 12.1? or similar dual lamp displays that have both individual lamp output connectors on the top side of the panel lxm1623 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) over a range of 5.2 to 6.7ma in 0.5ma steps. 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 current to save power or lower nominal brightness. rangemax? digital dimming technique provides flicker-free brightness control in any wide range typically (50:1+) 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 modules convert dc voltage from the system battery or ac adapter directly to high frequency, high-voltage waves required to ignite and operate ccfl lamps. a 12v input inverter is also available (lxm1623-12-44). the modules design utilizes microsemi?s lx 1689 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/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 ? fixed frequency operation ? rated from -20 to 70c ? applications ? lcd?s requiring both output connectors on one side of panel ? sharp lq104s1dg21/51 and lq121s1dg31 / 41 ? samsung ltm121si-t01 ? desktop displays ? industrial display controls benefits ? smooth, flicker free 2%-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 dc voltage source potentiometer pwm signal u niversal d imming i nput " pwm ", v dc , or p otentiometer 1 2 3 w 1 2 3 w s electable m aximum o utput c urrent 5.2m a to 6.7m a rms package order info p art n umber o utput c onnector i nverter m ates d irectly to p anel c onnectors LXM1623-05-44 jst sm02(8.0)b-bhs-1-tb or yeon ho 20015wr-05a00 jst bhr-03vs-1 l l x x m m 1 1 6 6 2 2 3 3 - - 0 0 5 5 - - 4 4 4 4
p roduction 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, 2005-01-17 www. microsemi . com panelmatch ? 5v dual 4w ccfl programmable inverter module integrated products absolute maximum ratings (note 1) input signal voltage (v in1 ).............................................................................................................................. ......-0.3v to 6.5v input power .................................................................................................................... ................................................... 10w output volta ge, no load ........................................................................................................ .... internally limited to 1800v rms output curr ent ................................................................................................................. ...........7.5ma rms (internally limited) output power ( each out put) ..................................................................................................... ........................................ 4.0w 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.................................................................................... .................-20c to 70c operating relative humi dity, non-c ondensing .................................................................................... ............................ 90% storage temperat ure range...................................................................................................... .........................-40c to 85c note 1: exceeding these ratings could cause 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 conditio ns. 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 in1 4.5 5 5.5 v output power (each output) p o 3.5 4.0 w linear brite control input voltage range v brt_adj 0.5 2.0 v lamp operating voltage v lamp 450 530 610 v rms lamp current (full brightness) i olamp 5.2 6.7 ma rms operating ambient temperature range t a -20 70 c 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. LXM1623-05-44 parameter symbol test conditions min typ max units ` output pin characteristics full bright lamp current (each output) i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 5v dc i set1 = ground, i set2 = ground 4.7 5.2 5.7 ma rms full bright lamp current (each output) i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 5v dc i set1 = ground, i set2 = open 5.2 5.7 6.2 ma rms full bright lamp current (each output) i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 5v dc i set1 = open, i set2 = ground 5.7 6.2 6.7 ma rms full bright lamp current (each output) i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 5v dc i set1 = open, i set2 = open 6.2 6.7 7.2 ma rms output current lamp to lamp deviation i ll%dev v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 5v dc i set1 = open, i set2 = open 3 10 % min. average lamp current (each output) i l(min) v brt_adj 0.5v dc , sleep > 2.0v, v in1 = 5v dc i set1 = i set2 = ground 0.30 ma rms lamp start voltage v ls -20c < t a < 70c, v in1 > 4.5v dc 1450 1600 v rms operating frequency f o v brt_adj = 2.5v dc , sleep > 2.0v, v in1 = 5v 57 60 63 khz burst frequency f burst output burst frequency 222 234 246 hz 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 integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2002 rev. 1.0a, 2005-01-17 www. microsemi . com panelmatch ? 5v dual 4w ccfl programmable inverter module integrated products electrical characteristics (continued) unless otherwise specified, the following specifications apply over the recommended operating condition and ambient temperature of 25 c except where otherwise noted. LXM1623-05-44 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 maximum input for min. lamp current v brt_adj i o(lamp) = minimum lamp current 0.4 0.5 v dc ` sleep input run mode sleep v 2.0 v in1 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 = 5v dc , sleep < 0.8v 0.0 10 50 a dc run current i in(run) v in1 = 5v dc , sleep 2.0v, i set1 = open i set2 = ground, v lamp = 500v rms 1460 ma dc efficiency v in1 = 5v dc , sleep 2.0v, i set1 = open i set2 = ground, v lamp = 500v rms 82 % functional pin description c onn p in d escription cn1 (molex 53261-0890) mates with 51021-0800 housing, 50079-8100 pins. mates with lx9501 input cable assembly cn1-1 cn1-2 v in1 main input power supply (4.75< v in1 < 5.25v) 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 (0.5v to 2.0v dc ). 2.0v dc gives maximum lamp current. cn1-7 set 1 set 1 msb connecting this pin to ground decreas es the output current (see table 1) cn1-8 set 2 set 2 lsb connecting this pin to ground decreases the output current (see table 1) cn2, cn3 for LXM1623-05-44 (jst sm02(8.0)b-bhs-1-tb or yeon ho 20015wr-05a00) cn2-1 cn3-1 v hi high voltage connection to high side of lamp. connec t to lamp terminal with shortest lead length. do not connect to ground. cn2-2 cn3-2 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 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, 2005-01-17 www. microsemi . com panelmatch ? 5v dual 4w ccfl programmable inverter module integrated products table 1 output current settings set 1 (pin 7) set 2 (pin 8) nominal output current open* open* 6.7ma open* ground 6.2ma ground open* 5.7ma ground ground 5.2ma * if driven by a logic signal it should be open collector or open drain only, not a voltage source. physical dimensions LXM1623-05-44 108.7mm 4.28in. cn1 22.35mm 0.88in. 3.05mm x 2 dia . 0.08 6mm screw head clearance weight: (18g) typ . 85.75mm 0.2mm 3.375in. 12.7mm 0.2mm 0.500in. 19.45mm 0.765in. 10.2mm max 0.402in. warning high voltage present at high side of transformer and output connectors w g rounded m ounting h ole p lastic s crew r equired 10.5mm 0.413in. 6.75mm 0.266in. pcb tolerance 0.5mm w w dimensions are in millimeter s (inches are for reference) simplified block diagram ramp gen transformer driver 0.5 - 2v dc + - lamp2 v lo v hi comparator ramp v brite set 1 high voltage transformer i sense oc sense set 2 +3v 10k 10k +3v +3v v in1 ov sense 10k controller lamp1 v lo v hi v hi z z z 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 integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2002 rev. 1.0a, 2005-01-17 www. microsemi . com panelmatch ? 5v dual 4w ccfl programmable inverter module integrated products typical application LXM1623-05-44 5v set 2 gnd v hi v lo brite v in1 sleep set 1 0.45v to 2.0v 1.8k 20k dac or pot ccfl tube nc nc one of two figure 1 ? brightness control (output current set to maximum) p.w. 2.5us to 125us brite LXM1623-05-44 0 < p.w. < 100% of period pwm signal from system figure 1a ? pwm brightness control LXM1623-05-44 set 2 gnd v hi v lo sleep set 1 ccfl tube brite 5v v in1 one of two l l 5.2ma rms l h 5.7ma rms h l 6.2ma rms h h 6.7ma 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 digita l pot or 20k manual pot. the inverter contains an internal 10k pull-up to 3v to bias the pot, add a 1.8k 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 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 manufact ures. 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 allo wable 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 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 typical output current) at nighttime. since the dim ratio is a factor of both the burst duty cycle and the peak output current, using this technique the effective dim ratio can be increased greater than the burst duty cycle alone. conversely, the set 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 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 for several seconds. after about 3 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 roduction 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, 2005-01-17 www. microsemi . com panelmatch ? 5v dual 4w ccfl programmable inverter module integrated products 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.
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