microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2000 rev. 1.0, 2006-03-23 www. microsemi . com rangemax ? 3.6/5v 2w, d igital d imming ccfl i nverter m odule p roduction d ata s heet tm ? description rangemax ? wide range dimming, single output inverter. the lxmg1615 series of direct drive ccfl (cold cathode fluorescent lamp) inverter modules are specifically designed for driving 8.4? and smaller lcd backlight lamps. they also target portable displays that rely on a single lithium-ion battery. lxmg1615 modules provide the designer with a vastly superior display brightness range. this brightness range is achievable with virtually any lcd display. rangemax? digital dimming technique. digital dimming provides flicker-free brightness control in any wide range (100:1+) dimming application. the modules are available with a dimming input that permits brightness control from either a dc voltage source or a pwm signal. the resultant ?burst drive? that energizes the lamp was designed specifically to ensure that no premature lamp degradation occurs (see the ?how rangemax works? section). v batt voltage range. the modules convert the dc voltage from a single li- ion battery (3.2-4.2v) or a fixed 5v supply directly to high-frequency, high- voltage waves required to ignite and operate ccfl lamps. direct drive technology. the modules design is based on a new direct drive topology, which provides a number of cost and performance advantages. additional features. other benefits of this new topology are fixed-frequency operation, secondary-side strike-voltage regulation and both open and shorted lamp protection. 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; patents pending key features ? rangemax wide range dimming ? v batt ? single li-ion cell operation or fixed 5v ? easy to use brightness control ? output short-circuit protection and automatic strike-voltage regulation ? fixed frequency operation ? rohs compliant applications ? pda and sub-notebook computers ? portable instrumentation ? target 8.4? and smaller panels benefits ? smooth, flicker free 1-100% full-range brightness control ? output open circuit voltage regulation minimizes corona discharge for high reliability ? power efficient, ?low brightness? capability allows for advanced power management product highlight lxmg1615 pdas, digital cameras, video camcorder, instrumentation, handheld gps 3.2 - 4.2v li-ion battery 4.5 - 5.5v instrumentation, sub notebooks, digital picture frames 260 - 380v rms 350 - 515v rms ccfl ccfl v batt v lamp f or l ower v oltage l amps f or h igher v oltage l amps one inverter supports either voltage range module order info p art n umber o utput c onnector i nverter m ates d irectly to p anel c onnectors lxmg1615-03-01 jst sm02(8.0)b-bhs-1-tb(lf)(sn) or yeon ho 20015wr-05a00 bhr-03vs-1 lxmg1615-03-02 jst sm02b-bhss-1-tb(lf)(sn) or yeon ho 35001wr-02a00 bhsr-02vs-1 lxmg1615-03-03 honda qz-19-a3myl #02 honda qz-19-3f01 l l x x m m g g 1 1 6 6 1 1 5 5 - - 0 0 3 3 - - x x x x
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2000 rev. 1.0, 2006-03-23 www. microsemi . com rangemax ? 3.6/5v 2w, d igital d imming ccfl i nverter m odule p roduction d ata s heet tm ? absolute maximum ratings recommended operating conditions 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 indicat e values beyond which the inverter, although operational, will not function optimally. recommended operating conditions parameter symbol min r.c. max units input supply voltage (+3.3v) +3.3 3.1 3.3 3.5 v v batt voltage range (v batt = 3.6v) v batt 3.2 3.6 4.2 v v batt voltage range (v batt = 5.0v) v batt 4.5 5.0 5.5 v output power (v batt = 3.6v) p o 1 1.2 1.5 w output power (v batt = 5.0v) p o 1.5 1.7 2 w brightness control input voltage range v brt_adj 0.0 2.2 v lamp operating voltage (v batt = 3.6v) v lamp 260 305 380 v rms lamp operating voltage (v batt = 5.0v) v lamp 350 445 515 v rms lamp current (full brightness) i olamp 4.0 ma rms operating ambient temperature range t a 0 70 c electrical characteristics unless otherwise specified, these specifications apply over the recommended operating conditions and 25c ambient temperature f or the lxmg1615-03-xx. lxmg1615-03-xx parameter symbol test conditions min typ max units ` output pin characteristics full bright lamp current i l(max) v brt_adj = 0v, v batt = 3.6v or 5v 3.5 4.0 4.5 ma rms min. average lamp current (note 2) i l(min) v brt_adj = 2.2v dc , v batt = 3.6v or 5v .08 ma rms lamp start voltage v ls v batt =3.2 ?4.2v or 4.5v to 5.5v 1250 1400 1800 v rms operating frequency f o v brt_adj = 0vdc 80 90 100 khz ` brite input linear dim control range v brt .25 2.2 v dc v brt_adj = 0v dc -21 -27 -41 a dc input current i brt v brt_adj = 2.5v dc 250 268 290 a dc input voltage for max. lamp current v brt_adj i o(lamp) = 100% duty cycle 0 .25 v dc input voltage for min. lamp current v brt_adj i o(lamp) = minimum duty cycle 2.2 2.5 v dc ` +3.3v run mode enable +3.3v = high 3.1 3.3 3.5 v dc off mode disable +3.3v = low -0.3 0.0 2.7 v dc iin run 10 20 input current iin pk +3.3v 5% 100 ma ` vsync characteristics logic high threshold v sync (hi) +3.3v = 3.3v 5% 2.2 v dc logic low threshold v sync (lo) +3.3v = 3.3v 5% .8 v dc input impedance z in 10 k input frequency fv sync 45 400 hz free run frequency f burst output burst rate; v sync =0v 530 hz e e l l e e c c t t r r i i c c a a l l s s input supply voltage (v batt ) .............................................................................................................................. -0.3v to 6.5v input supply volt age 3.3v (+3.3) ............................................................................................... ........................ -0.3v to 5.5v output volta ge, no load ........................................................................................................ ... internally limited to 1800v rms output curr ent ................................................................................................................. .........4.5ma rms (internally limited) output power ................................................................................................................... .............................................. 2.1w input signal volt age (brite input) ............................................................................................. .............-0.3v to 3.3v +0.3v input signal voltage ( sync).................................................................................................... ................-0.3v to 3.3v +0.3v a mbient operating temper ature, zero airflow..................................................................................... ................. 0c to 70c storage temperat ure ra nge...................................................................................................... .......................-40c to 85c note: exceeding these ratings could cause da mage to the device. all voltages are with respect to ground. currents are positi ve into, negative out of specified terminal.
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2000 rev. 1.0, 2006-03-23 www. microsemi . com rangemax ? 3.6/5v 2w, d igital d imming ccfl i nverter m odule p roduction d ata s heet tm ? electrical characteristics (continued) unless otherwise specified, these specifications apply over the recommended operating conditions and 25c ambient temperature f or the lxmg1615-03-xx. lxmg1615-03-xx parameter symbol test conditions min typ max units ` power characteristics run current v batt = 3.6v dc v brt_adj = 0v, v lamp = 270v rms 360 ma run current v batt = 5.0v dc v brt_adj = 0v, v lamp = 420v rms 405 ma note 2: minimum lamp current required to maintain even light output may vary with display panel. ) 4.0ma of amplitude burst ( ) cycle duty burst ( current rms average rms = functional pin description conn. pin description cn1 (molex 53261-0571) * cn1-1 v batt main input power su pply (3.1v to 5.5v) cn1-2 gnd power supply return cn1-3 +3.3v +3.3v logic input cn1-4 brite brightness control (0.25- 2.2v dc) 0.25vdc gives maximum lamp current cn1-5 v sync vertical synchronization input 3.3v logic level (45 < f sync < 400hz) cn2 for lxmg1615-03-01,-02 ( jst sm02(8.0)b-bhs-1-tb (lf)(sn) | yeon ho 20015wr-05a00, sm02b-bhss-1-tb (lf)(sn) | yeon ho 35001wr-02a00 ) cn2-1 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 v lo connection to low side of lamp. connect to lamp terminal with longer lead length. do not connect to ground. cn2 for lxmg1615-03-03 (honda qz-19-a3myl#02) cn2-3 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 v lo connection to lower side of lamp. connect to lamp terminal with lo nger lead length. do not connect to ground. * lx9506g mating connector assembly available physical dimensions 1.0mm 0.0394in. weight: (5.5g) typ . 4.6mm max 0.181in. 94mm 3.70in cn1 cn2 w 10mm 0.394in. 2.5mm 0.0984in. 15mm 0.591in. 12.5mm 0.492in x pcb tolerances 0.5mm, m2 or 2-56 recommended mounting screws warning high voltage present at high side of transformer and output connector g rounded m ounting h ole 3.18mm 0.08 dia . 69mm 0.2mm 2.71in. r1.0 p p a a c c k k a a g g e e d d a a t t a a
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2000 rev. 1.0, 2006-03-23 www. microsemi . com rangemax ? 3.6/5v 2w, d igital d imming ccfl i nverter m odule p roduction d ata s heet tm ? how the rangemax works lamp voltage & lamp current ? burst mode operation figure 1 ? 50% burst duty cycle figure 2 ? 2% burst duty cycle rather than using the trad itional dimming technique of varying lamp current magnitude to adjust light output, rangemax inverters use a fixed lamp current value with a duty cycle control method. the lamp current burst width can be modulated from 100% (continuous lamp current) down to a 2% duty cycle, allowing the lamp to be dimmed to less than 1% of its full brightness. as can be seen in trace 4 of fi gure 3 photo at right, careful design consideration was given to controlling lamp start voltage to softly start current flow. th is eliminates current overshoot that can result in premature cath ode wear and reduce lamp life. figure 3 ? 2% burst duty cycle (expanded time base) ramp gen. transformer driver high voltage transformer comparator ramp + - i sense v sense lamp v lo v hi v brite .25 - 2.2v dc figure 4 ? rangemax simplified block diagram highlights ? integrated brightness control circuit includes a dc voltage to pulse width converter that minimizes system design work and system noise susceptibility. this provides a familiar and convenient interface while reducing the potential for externally induced noise, which can cause lamp flicker. ? rangemax inverter modules are designed to operate with the burst frequency synchronized to the video frame rate. this provides operation with no visible display disturbances caused by beat frequencies between the lamps and video frame rates. in this synchronous mode, the inverter burst rate operates at twice the video refresh rate, well beyond standard 50/60hz video refresh rates where the eye can perceive pulsing light. ? in applications with no access to a vertical sync, an onboard oscillator operates the inverter burst rate at about 500hz. in this non-synchronous mode, minor display disturbances can be found under certain video conditions. this performance may be acceptable for many applications, but synchronization must be used when no disturbance can be tolerated. d d e e s s c c r r i i p p t t i i o o n n
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2000 rev. 1.0, 2006-03-23 www. microsemi . com rangemax ? 3.6/5v 2w, d igital d imming ccfl i nverter m odule p roduction d ata s heet tm ? how the rangemax works (continued) highlights (continued) ? separate feedback loops for lamp current and open circuit voltage regulation insure reliable strike under all operating conditions, automatic over-voltage prevention with broken or failed lamps, and accurate lamp current regulation. ? a single input will accommodate negative and positive vertical sync pulses at any pulse width. typical application ? the brightness control may be a voltage output dac, or other voltage source as shown in figure 5. a 3.3v logic level pwm signal from a micro-controller may also be used as shown in figure 5a. ? if synchronization to the video frame rate is desired, connect the vertical sync pu lse from the system video controller to the vsync input. if no video synchronization is desired, connect vsync to ground. ? if you need to turn the inverter on/off remotely, use the +3.3v logic supply pin. ? connect vhi to high voltag e wire from the lamp. connect vlo to the low voltage wire (wire with thinner insulation). never connect vlo to circuit ground as this will defeat lamp current regula tion. if both lamp wires have heavy high voltage insulation, connect the longest wire to vlo. this wire is typically white. rangemax inverters also available in higher power single lamp inverters lxmg1612-xx-xx, dual output lxmg1621-01, lxmg1622-xx-xx and quad output lxmg1641-01 versions for multiple lamp applications. lxmg1615-03-xx 3.3v dc 3.2v - 4.2v or 5v v sync sync gnd v hi v lo brite figure 5 - brightness control +3.3v v batt ccfl tube p.w. < 200s brite lxmg1615-03 0 < p.w. < 100% of period pwm signal from system figure 5a - pwm brightness control lxmg1615-03-xx output current adjust the lxmg1615-03-xx output current can be adjusted lower by changing the value of one resistor (r10) on the pcb. the following table shows the new output current values: 4.0marms 137k 1% (stock setting) 3.5marms 95.3k1% 3.0marms 68.1k1% 2.5marms 49.9k1% 2.0marms 36.5k1% r11 r19 u1 r8 c10 c8 r6 c7 c6 c5 c4 c12 d1 c13 c14 c15 c16 c17 r18 r22 c11 r9 cn1 r7 r5 c1 c3 r4 r3 r2 r1 f1 r10 c9 a a p p p p l l i i c c a a t t i i o o n n
microsemi integrated products division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2000 rev. 1.0, 2006-03-23 www. microsemi . com rangemax ? 3.6/5v 2w, d igital d imming ccfl i nverter m odule p roduction d ata s heet 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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