p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2010 rev. 1.0, 2010-10-13 www. microsemi . com r r a a n n g g e e m m a a x x ? ? s s t t a a y y l l i i t t ? ? LXMG1645-24-53 24v quad 5w ccfl inverter module tm ? l l x x m m g g 1 1 6 6 4 4 5 5 - - 2 2 4 4 - - 5 5 3 3 description the LXMG1645-24-53 is a quad 5w output ccfl (cold cathode fluorescent lamp) inverter module specifically designed for driving nec nl12876bc26- 25 lcd panel or similar quad lamp panels. the inverter includes a dimming input that permits brightness control from a pwm signal. rangemax? digital dimming technique provides flicker-free brightness control in any wide range (typically 50:1+) dimming application. the module converts a dc voltage from the system battery or ac adapter directly to high frequency, high-voltage waves required to ignite and operate ccfl lamps. 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 inverter also has a dedicated fail pin that indicates an open/shorted lamp condition. in addition when only one or two lamps on either side sustain a fault the lamps on the other side will remain in normal operation. this mode of operation during lamp(s) failure is called staylit? since the panel is able to still remain on although at reduced brightness. the module?s design is based on microsemi?s lx6512 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 and secondary-side strike-voltage regulation. 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 ? staylit? redundancy ? pwm brightness control ? rangemax? wide range dimming ? output short-circuit protection and automatic strike-voltage regulation ? fixed frequency operation ? rated from -30 to 80c ? ul 60950 pending ? rohs compliant applications ? high brightness displays ? desktop displays ? medical monitors benefits ? smooth, flicker free 2%- 100% optical brightness range ? product highlight cn1 microsemi hi hi 123 4 w cn2 123 4 w cn3 123 w 4 123 w 4 hi hi cn4 cn5 pwm d imming i nput lamp fault signal package order info p art n umber o utput c onnectors i nverter m ates d irectly to p anel c onnectors LXMG1645-24-53 four jst sm02(8.0)b-bhs-1-tb(lf )(sn) or yeon ho 20015wr-05a00 jst bhr-03vs-1
p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2010 rev. 1.0, 2010-10-13 www. microsemi . com r r a a n n g g e e m m a a x x ? ? s s t t a a y y l l i i t t ? ? LXMG1645-24-53 24v quad 5w ccfl inverter module tm ? l l x x m m g g 1 1 6 6 4 4 5 5 - - 2 2 4 4 - - 5 5 3 3 absolute maximum ratings input signal voltage (v in , fail ) ...................................................................................................................... ......-0.3v to 30v input po wer ................................................................................................................... .................................................... 24w output voltage, no load ....................................................................................................... ...................................... 1900v rms output current(each output) ................................................................................................... ........................................ 9.0ma output power(each output) ..................................................................................................... ............................................ 5w input signal voltage (enable, pwm) ............................................................................................ .....................-0.3v to 5.5v ambient operating temper ature, zero airflow ................................................................................... ................. -30c to 80c operating relative humi dity, non-condensing ................................................................................... ..................... 0% to 95% storage temperat ure ra nge ..................................................................................................... ......................... -40c to 90c 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. parameter symbol recommended operating conditions units min r.c. max input supply voltage range (fully regulated lamp current) v in 21.6 24 26.4 v output power (each output) p o 4.0 5.0 w dc brite control input voltage range v brt 0 3.0 v direct low frequency pwm duty control range f duty 10 100 % burst frequency 1 f pwm 100 120 225 hz amplitude v pwm 3.0 5.5 v rise/fall time t r, t f 0 3 s lamp current (full brightness) 2 i olamp 5.5 6.0 6.5 ma rms lamp operating voltage v lamp 530 625 720 v rms 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; enable > 2.5v, v in = 24v , f duty =100%, f pwm = 120hz, ta = 25 c. parameter symbol test conditions / comment min typ max units output characteristics full bright lamp current (each lamp) i ol100 n 3 pwm = 100% or open 5.5 6.0 6.5 ma rms full dim lamp current (each lamp) i ol100 n v b = 3v, pwm=10% 1.6 ma rms lamp run voltage (each lamp) v l_run pwm = 100% or open 670 v rms lamp start voltage (each lamp) v ls t a = -30c, v in 21.6v 1820 v rms operating frequency f o 45.5 47.5 48.0 khz optical dim range (by pwm) 4 n:1 _brtp center area brightness, max/min 50 ratio output current lamp to lamp deviation i ol m,n m i n i m i ol ol ol ? m=1,2,3,4, n= 1~4 not m 5 %
p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2010 rev. 1.0, 2010-10-13 www. microsemi . com r r a a n n g g e e m m a a x x ? ? s s t t a a y y l l i i t t ? ? LXMG1645-24-53 24v quad 5w ccfl inverter module tm ? l l x x m m g g 1 1 6 6 4 4 5 5 - - 2 2 4 4 - - 5 5 3 3 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; enable > 2.5v, v in = 24v , f duty =100%, f pwm = 120hz, ta = 25 c. parameter symbol test conditions / comment min typ max units pwm input, pwm dim control pwm high level amplitude v pwm h 3 v pwm low level amplitude v pwm l 0.3 v pwm jitter jitter 3 s pwm frequency range f pwm 100 120 225 hz pwm duty range f duty 10 100 % enable input disable off v en_off 0 0.5 v enable on v en_on 2.5 5.5 v enable on v en_on t a = -30c 2.8 5.5 v v in quiescent current i_ q enable= 0v 260 400 a power on sequence v in to enable t pwr_on v in = 24v +/- 10% before enable goes high 1 msec power characterisitics supply current i run no lamp fault 710 853 ma v in under voltage lock out threshold v in uvlo v in rising edge 20 v v in uvlo hysteresis v hys 0.7 v supply current during fault timeout i flt all 4 lamps open 30 ma efficiency load = 110k resistive load 85 90 % strike timeout strike (all open lamps) t s_dwell 1200 msec open lamp output voltage v stk all lamps not connected 1650 v rms fail fail pin voltage v flt_n no fault , pull-up 2.4k to v in v in v fail pin leakage current i flt_lkg no fault , pull-up 2.4k to v in 10 a fail pin voltage v flt_f open lamp , pull-up 2.4k to v in 0.4 v fail invalid time t strike all 4 lamps open 2.5 sec fail sensing time t d_fail from occurrence of one lamp open or short 275 msec strike mode staylit? strike time period t sl_to only one of two lamps ignited on cn2~cn3 or cn4 ~ cn5 600 msec lamp current lamp current of non-faulty side ( open or short) i l_fn open or short one lamp, full bright 5.7 6.2 6.7 ma rms lamp current of non-faulty side ( short or short) i l_fn open or short one lamp, full dim 1.65 ma rms 1 direct pwm (low) frequency should be selected such to not have optical interference. 2 lamp current is specified with nec nl12876bc26-25 and all 4 lamps connected with frame of panel grounded. 3 n is lamp number cn1 ? 1, cn2 ? 2, cn3 ? 3, cn4 ? 4 4 at room temp, 1 hour full brightness operation and 1 hour full dim operation measurement ratio.
p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2010 rev. 1.0, 2010-10-13 www. microsemi . com r r a a n n g g e e m m a a x x ? ? s s t t a a y y l l i i t t ? ? LXMG1645-24-53 24v quad 5w ccfl inverter module tm ? l l x x m m g g 1 1 6 6 4 4 5 5 - - 2 2 4 4 - - 5 5 3 3 functional pin description c onn p in d escription cn1 (wurth electronik 690367291076 or equivalent) cn1-1 v in main input power supply 21.6v ~ 26.4v cn1-3 cn1-5 cn1-2 gnd power supply return cn1-4 cn1-6 cn1-7 nc nc cn1-8 enable on/off control, on: 2.5v ~ 5.5v, off: 0 ~ 0.5v or open cn1-9 pwm low frequency burst pwm dimming input cn1-10 fail fail status output: normal st ate: open drain outpu t, fail state ?0v? cn2, cn3, cn4, cn5 (jst sm02(8.0)b-bhs-1-tb(lf )(sn) | yeon ho 20015wr-05a00 or equivalent) cn2-1, cn3-1 cn4-1, cn5-1 lamp hi high voltage connection to high side of lamp. connec t to lamp terminal with shortest lead length. do not connect to ground. cn2-3, cn3-3 cn4-3, cn5-3 lamp lo connection to low side of lamp. connect to lamp terminal with longer lead length. do not connect to ground
p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2010 rev. 1.0, 2010-10-13 www. microsemi . com r r a a n n g g e e m m a a x x ? ? s s t t a a y y l l i i t t ? ? LXMG1645-24-53 24v quad 5w ccfl inverter module tm ? l l x x m m g g 1 1 6 6 4 4 5 5 - - 2 2 4 4 - - 5 5 3 3 staylit function table fault definition: (f) 1. open:( o ) lamp is not connected ( either high side wire open or return wire open) 2. short1:( s1 ) lamp high side wire is shorted to lamp return side wire 3. short2:( s2 ) lamp high side wire is shorted to ground 4. short3:( s3 ) lamp return wire is shorted to gnd 5. arcing: lamp high side wire is creating the arcing path after the inverter is enabled. f means either o,s1, s2, or s3 n = connected lamp and normal operation fault conditions inverter operation fail signal lamp 1 lamp 2 lamp 3 lamp 4 fault exists prior to turn-on fault occurs during ignition fault occurs during run mode n n n n all on action after t strike action after t strike action after t d _ flt n n n f with exception of affected lamps for ?o, s1, s2? fault conditions, all unaffected lamps are on , including affected lamp in a single s3 fault condition. an s1 fault will typically reduce opposing operational lamp current by 43% open drain to low open drain to low open drain to low n n f n n n f f n f n n n f n f n f f n n f f f f n n n f n n f f n f n f n f f f f n n f f n f f f f n f f f f all off vin enable fail t strike fail occur t pwr_on t d_flt
p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2010 rev. 1.0, 2010-10-13 www. microsemi . com r r a a n n g g e e m m a a x x ? ? s s t t a a y y l l i i t t ? ? LXMG1645-24-53 24v quad 5w ccfl inverter module tm ? l l x x m m g g 1 1 6 6 4 4 5 5 - - 2 2 4 4 - - 5 5 3 3 mechanical dimensions 77.5mm 3.051 in. 200mm 0.5 7.874 in. cn3 cn4 1.6mm 0.1 0.063 in. 11.8mm max 0.465in. weight: 65g typ. pcb tolerances 0.2mm, unless otherwise noted , 4-40 recommended mounting screws g rounded m ounting h ole 3.06 mm .08 dia. 6 mm head clearance 4 holes warning high voltage is present at high side of each transformer, its core and the high side of the output connector pins, please provide at least 3 mm clearance (in all directions) on the component side of the board to any conductor when mounting cn2 cn5 10.00 5.00 5.00 5.00 5.00 cn1 50mm 0.5 1.969in. m ounting h ole 3.06 mm .08 dia. x 1 microsemi 185mm 7.283 in. 190mm 7.480 in.
p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 7 copyright ? 2010 rev. 1.0, 2010-10-13 www. microsemi . com r r a a n n g g e e m m a a x x ? ? s s t t a a y y l l i i t t ? ? LXMG1645-24-53 24v quad 5w ccfl inverter module tm ? l l x x m m g g 1 1 6 6 4 4 5 5 - - 2 2 4 4 - - 5 5 3 3 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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