p reliminary d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2002 rev. 0.2d, 2003-01-20 www. microsemi . com panelmatch ? 12v dual 4w ccfl programmable inverter module integrated products description the lxm1623-12-4x is a dual 4w output direct drive? ccfl (cold cathode fluorescent lamp) inverter module specifically designed for driving lcd backlight lamps. it is ideal for driving typical 6.4? to 10.4? tft panels. 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 or a pwm signal or external potentiometer. the maximum output current is externally programmable over a range of 5 to 6.5ma in 0.5ma steps to allow the inverter to properly match to a wide array of lcd panel lamp current specifications. 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 was 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 5v input inverter also is available (lxm1623-05-4x), as well as 6w versions (lxm1623-xx-6x) for driving larger higher voltage panels. the modules 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/shorted lamp protection with fault timeout. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com 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 ul60950 e175910 applications high brightness displays portable instrumentation 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 m a to 6.5 m a rms package order info p art n umber o utput c onnector i nverter m ates d irectly to p anel c onnectors LXM1623-12-41 jst sm02(8.0)b-bhs-1-tb jst bhr-03vs-1 lxm1623-12-42 jst sm02b-bhss-1-tb jst bhsr-02vs-1 lxm1623-12-43 honda qz-19-a3myl #02 honda qz-19-3f01 l l x x m m 1 1 6 6 2 2 3 3 - - 1 1 2 2 - - 4 4 x x
p reliminary d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2002 rev. 0.2d, 2003-01-20 www. microsemi . com panelmatch ? 12v dual 4w ccfl programmable inverter module integrated products absolute maximum ratings (note 1) input signal voltage (v in1 ).............................................................................................................................. .......-0.3v to 15v input po wer .................................................................................................................... ................................................... 10w output volta ge, no load ........................................................................................................ .... internally limited to 1500v rms output curr ent ................................................................................................................. ...........7.5ma rms (internally limited) output power ( each out put) ..................................................................................................... ........................................ 4.0w 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 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 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 operational, 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 (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 350 440 530 v rms lamp current (full brightness) i olamp 5 6.5 ma rms operating ambient te mperature range t a -20 70 c electrical characteristics unless otherwise specified, the following spec ifications apply over the recommended op erating condition and ambient temperature of 25 c except where otherwise noted. lxm1623-12-4x 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 = 12v dc i set1 = ground, i set2 = ground 4.5 5 5.5 ma rms full bright lamp current (each output) i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 12v dc i set1 = ground, i set2 = open 5.0 5.5 6.0 ma rms full bright lamp current (each output) i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 12v dc i set1 = open, i set2 = ground 5.5 6 6.5 ma rms full bright lamp current (each output) i l(max) v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 12v dc i set1 = open, i set2 = open 6.0 6.5 7.0 ma rms output current lamp to lamp deviation i ll%dev v brt_adj > 2.0v dc , sleep > 2.0v, v in1 = 12v 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 = 12v dc i set1 = i set2 = ground 0.30 ma rms lamp start voltage v ls -20c < t a < 70c, v in1 > 10.8v dc 1250 1400 v rms operating frequency f o v brt_adj = 2.5v dc , sleep > 2.0v, v in1 = 12v 76 80 83 khz burst frequency f burst output burst frequency 148 156 163 hz e e l l e e c c t t r r i i c c a a l l s s
p reliminary d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2002 rev. 0.2d, 2003-01-20 www. microsemi . com panelmatch ? 12v dual 4w ccfl programmable inverter module integrated products electrical characteristics (continued) unless otherwise specified, the following spec ifications apply over the recommended op erating condition and ambient temperature of 25 c except where otherwise noted. lxm1623-12-4x 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 = 12v dc , sleep < 0.8v 0.0 10 50 a dc run current i in(run) v in1 = 12v dc , sleep 2.0v, i set1 = open i set2 = ground, v lamp = 440v rms 530 ma dc efficiency v in1 = 12v dc , sleep 2.0v, i set1 = open i set2 = ground, v lamp = 440v rms 85 % 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 (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 (0.5v 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 decr eases the output current (see table 1) cn2, cn3 for LXM1623-12-41 and -42 (jst sm02(8.0)b-bhs-1-tb or sm02b-bhss-1-tb) 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 cn2, cn3 for lxm1623-12-43 (honda qz-19-a3myl #02) cn2-3 cn3-3 v hi high voltage connection to high side of lamp. connec t to lamp terminal with shortest lead length. do not connect to ground. cn2-1 cn3-1 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 reliminary d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2002 rev. 0.2d, 2003-01-20 www. microsemi . com panelmatch ? 12v 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* 6.5ma open* ground 6.0ma ground open* 5.5ma ground ground 5.0ma * if driven by a logic signal it should be open collector or open drain only, not a voltage source. physical dimensions lxm1623-12-4x 4.52in 115mm 3 1 1 w w sm02(8.0)b-bhs-1-tb (jst) sm02b-bhss-1-tb (jst) -01 -02 honda qz-19-a3myl #02 -03 0.0392in. 1.0mm 1.18in. 30mm g rounded m ounting h ole 3 mm x 2 dia. 0.08 6 mm screw head clearance weight: (15g) typ . 4.29in 109mm 1.02in. 26mm cn-3 cn-2 0.15in. 4mm 0.23in 6mm 0.256in. 6.5mm max warning high voltage present at high side of transformer and output connector pcb tolerances 0.5mm simplified block diagram ramp gen transformer driver 0.5 - 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 one of two p p a a c c k k a a g g e e d d a a t t a a
p reliminary d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2002 rev. 0.2d, 2003-01-20 www. microsemi . com panelmatch ? 12v dual 4w ccfl programmable inverter module integrated products typical application lxm1623-12-4x 12v 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 . 10us to 125us brite lxm1623-12-4x 0 < p.w. < 100% of period pw m signal from system figure 1a ? pwm brightness control lxm1623-12-4x set 2 gnd v hi v lo sleep set 1 ccfl tube brite 12v v in1 one of two l l 5.0ma rms l h 5.5ma rms h l 6.0ma rms h h 6.5ma 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 digital 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 se t the lower threshold voltage. a 3.3v logic level pwm signa l 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 manufactures. ge nerally 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 a llowable 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 a ll 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 exampl e 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 i nputs 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 2 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 reliminary d atasheet microsemi integrated products 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2002 rev. 0.2d, 2003-01-20 www. microsemi . com panelmatch ? 12v dual 4w ccfl programmable inverter module integrated products notes 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 consent 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. n n o o t t e e s s
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