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| p reliminary d atasheet microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 1 copyright ? 2000 rev. 0.3f, 2000-12-06 www. microsemi . com LXM1612-12-XX 12v highly-integrated, digital dimming ccfl inverter module a microsemi company rangemax wide range dimming, single output inverter. the lxm1612- 12-xx series of direct drive? ccfl (cold cathode fluorescent lamp) inverter modules are specifically designed for driving lcd backlight lamps. rangemax digital dimming technique. digital dimming provides flicker-free brightness control in any wide-range dimming application. the modules are equipped with a dimming input that permits brightness control from either an external potentiometer, dc voltage source, or pwm signal. the resultant burst drive that energizes the lamp was designed specifically to ensure that no premature lamp degradation occurs. input voltage range. 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 is also available (lxm1612-05-xx). direct drive technology. the module 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 and secondary-side strike- voltage regulation and all lxm1612-12- xx modules feature both open and shorted lamp protection. important: for the most current data, consult microsemi s website: http://www.microsemi.com rangemax wide range dimming 9.6v to 14.4v input voltage fully integrated direct drive and dimming control single sided pcb layout easy to use brightness control microamp sleep mode output short-circuit protection and automatic strike-voltage regulation fixed frequency operation notebook and sub-notebook computers portable instrumentation desktop displays low ambient light conditions (i.e. aircraft cabins, automobile) smooth, flicker free 1-100% full-range brightness control gives your product a high quality image output open circuit voltage regulation minimizes corona discharge for long life and high reliability power efficient. low brightness capability allows for advanced power management 1 23 dc voltage source potentiometer pwm signal p art n umber o utput c onnector i nverter m ates d irectly to p anel c onnectors lxm1612-12-01 jst sm02(8.0)b-bhs-1-tb bhr-03vs-1 lxm1612-12-02 jst sm02b-bhss-1-tb bhsr-02vs-1 lxm1612-12-03 honda qz-19-a3myl #02 qz-19-3f01 l l x x m m 1 1 6 6 1 1 2 2 - - 1 1 2 2 brite p reliminary d atasheet microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 2 copyright ? 2000 rev. 0.3f, 2000-12-06 www. microsemi . com LXM1612-12-XX 12v highly-integrated, digital dimming ccfl inverter module a microsemi company input signal voltage (v in1 ) .............................................................................................................................. ...-0.3v to 16v output voltage, no load........................................................................................................ ..internally limited to 1800v rms output current................................................................................................................. ........ 8.0ma rms (internally limited) output power................................................................................................................... ................................................ 6.0w input signal voltage (brite input) ............................................................................................. .....................-0.3v to 5.5v input signal voltage ( sleep , v sync inputs) .....................................................................................................-0.3v to 5.5v ambient operating temperature, zero airflow.................................................................................... ................. 0c to 70c storage temperature range ...................................................................................................... ........................ -40c to 85c note 1: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into , negative out of specified terminal. cn1 (molex 53261-0890) mates with 51021-0800 housing, 50079-8100 pins cn-1 cn1-2 v in1 main input power supply (9.6v < v in1 < 14.4v) cn1-3 cn1-4 gnd power supply return cn1-5 sleep on/off control. (2.1v < sleep < v in1 = on, 0v < sleep < 0.8v = off, sleep floating=off) cn1-6 brite brightness control (0.0v to 2.5v dc ). 2.5v dc gives maximum lamp current. cn1-7 brite rtn analog ground. use for brite signal return only. cn1-8 v sync vertical synchronization input. 2.5 to 5.0v logic level. (20hz < f sync < 200hz) cn2 for lxm1612-12-01 and -02 (jst sm02(8.0)b-bhs-1-tb or sm02b-bhss-1-tb) cn2-1 v hi high voltage connection to high side of lamp. connect 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 lxm1612-12-03 (honda qz-19-amyl#02) cn2-3 v hi high voltage connection to high side of lamp. connect to lamp terminal with shortest lead length. do not connect to ground. cn2-1 v lo connection to low side of lamp. connect to lamp terminal with longer lead length. do not connect to ground 4.96in. 126mm 0.06in. 1.52mm cn-1 cn-2 0.13in. 3.3mm 0.66in. 16.75mm sm02(8.0)b-bhs-1-tb (jst) sm02b-bhss-1-tb (jst) -01 -02 honda qz-19-a3myl #02 1 3 1 1 weight: 12.5 (g) typ . 0.63in. 16mm -03 3.64in. 92.5mm 0.5in. 12.7mm 0.315in . 8.0mm g rounded m ounting h ole g rounded m ounting h ole 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 linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 3 copyright ? 2000 rev. 0.3f, 2000-12-06 www. microsemi . com LXM1612-12-XX 12v highly-integrated, digital dimming ccfl inverter module a microsemi company this module has been designed to operate over 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 9.6 12 14.4 v output power p o 3.5 4.0 w brightness control input voltage range v brt_adj 0.0 2.5 5 v lamp operating voltage v lamp 450 535 620 v rms lamp current (full brightness) i olamp 5.8 ma rms operating ambient temperature range ta 0 70 c unless otherwise specified, the following specifications apply over the recommended operating conditions and ambient temperatur e of 25 c except where otherwise noted. LXM1612-12-XX parameter symbol test conditions min typ max units output pin characteristics full bright lamp current i l(max) v brt_adj =2.5v dc , sleep =high, burst duty=100%, v in1 =12v dc 5.2 5.8 6.4 ma rms min. average lamp current (note 2) i l(min) v brt_adj =0v dc , sleep =high, burst duty=2.0%, v in1 =12v dc 0.12 ma rms lamp start voltage v ls 0c p reliminary d atasheet microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 4 copyright ? 2000 rev. 0.3f, 2000-12-06 www. microsemi . com LXM1612-12-XX 12v highly-integrated, digital dimming ccfl inverter module a microsemi company burst mode operation !"# C 50% burst duty cycle !"# C 2% burst duty cycle rather than using the traditional 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 figure 3 photo at right, careful design consideration was given to controlling lamp start voltage to softly start current flow. this eliminates current overshoot that can result in premature cathode wear and reduce lamp life. !"# $ C 2% burst duty cycle (expanded time base) ramp gen transformer driver 0.25 - 2.5v dc + - lamp v lo v hi comparator ramp v brite v sync high voltage transformer i sense v sense !"# % C rangemax block diagram d d e e s s c c r r i i p p t t i i o o n n p reliminary d atasheet microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 5 copyright ? 2000 rev. 0.3f, 2000-12-06 www. microsemi . com LXM1612-12-XX 12v highly-integrated, digital dimming ccfl inverter module a microsemi company 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 250hz. 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. a single input will accommodate negative and positive vertical sync pulses at any pulse width. 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. LXM1612-12-XX 12v v sync v sync gnd v hi v lo brite figure 5 - potentiometer brightness control v in1 ccfl tube brite rtn r 10k sleep 0v 5v dac or pot p.w . < 2ms brite LXM1612-12-XX 0 < p.w. < 100% of p eriod pw m signal from system figure 5a - pw m brightness control the brightness control may be a voltage output dac, digital resistor or a simple 10k potentiometer. if desired, an additional series resistor with the 10k potentiometer can be used to set a higher minimum brightness setting as shown in figure 5. a 2.5v to 5v 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 pulse from the system video controller to the v sync input. if no video synchronization is desired, connect v sync to ground. if you need to turn the inverter on/off remotely, connect to 2.5v to 5v 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. &' &' ( ( the lxm1612-05 output current can be adjusted by changing the value of two resistors on the pcb. the following table shows the approximate new output current values: output current r12 r16 7.0ma 2.00k 1% not used 6.0ma 2.61k 1% not used 5.8ma 2.74k 1% not used 5.0ma 2.74k 1% 499k 1% 4.0ma 2.74k 1% 178k 1% 3.0ma 2.74k 1% 78.7k 1% c2 u1 c9 r7 c11 r14 r15 c15 c12 r11 c14 c13 r10 c16 c10 r13 c17 r3 r4 c3 c4 r2 c5 c6 c8 r5 r6 r17 r37 r36 r35 c21 r38 r39 r32 r31 r40 r41 r20 c7 r21 u3 r34 r33 r30 u4 d2 d1 r16 r12 - component replacement locations d d e e s s c c r r i i p p t t i i o o n n p reliminary d atasheet microsemi linfinity microelectronics division 11861 western avenue, garden grove, ca. 92841, 714-898-8121, fax: 714-893-2570 page 6 copyright ? 2000 rev. 0.3f, 2000-12-06 www. microsemi . com LXM1612-12-XX 12v highly-integrated, digital dimming ccfl inverter module a microsemi company preliminary data C information contained in this document is pre-production data and is proprietary to linfinity. it may not be modified in any way without the express written consent of linfinity. product referred to herein is offered in sample form only and linfinity 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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