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description key features drive two lamps with one module small, compact size high efficiency multiple outputs provide easy lcd connections low emi and noise low power sleep mode output short and open circuit protection 3:1 dimming control adjustable lamp current up to 6.0ma per lamp long lamp life with soft-start and accurate lamp current regulation applications desktop lcd monitors and panels industrial lcd panels hi-brite displays this allows the display to remain "on-line" until lamp replacement is convenient. dual module uses standard power supply. the lxm1620 module uses a standard 12v 10% input supply. it also ensures nomi- nal power consumption with 2 lamps requiring only 8 watts. lamp current is fully regulated with respect to input voltage and output imped- ance variations. dimming features. the lxm1620 mod- ules are equipped with a dimming input that per- mits brightness control from an external poten- tiometer or dc voltage. in addition, the sleep input reduces module power to a few microwatts in shut down mode. all lxm1620 modules fea- ture both output open and short-circuit protec- tion. the most efficient and cost-effective backlight inverter for desk- top/industrial applications. linfinity's pro- prietary direct drive architecture is the highest efficiency, small form factor solution for all multiple lamp applications. the lxm1620 is fully customizable (electronically and mechani- cally) to specific customer requirements. 1 us patent numbers: 5923129 & 5930121 the dual output module ideal for desktop and industrial applications. the lxm1620 direct drive tm cold cathode fluo- rescent lamp (ccfl) inverter is a single mod- ule designed to drive two lamps and is targeted for use with desktop liquid crystal display (lcd) and industrial lcd panels typically rang- ing in size from 10.4-inches to 17-inches. this two output inverter is the ideal solution to power virtually any two lamp application. direct drive technology. the module de- sign is based on a new patented 1 direct drive topology, which provides a number of cost and pe r fo r mance advantages. the lxm1620-01 direct drive inverters eliminate the classic reso- nant inductor and capacitors, thus reducing cost and allowing a substantial reduction in module size. fixed-frequency operation. other ben- efits of this new topology are fixed-frequency operation and secondary-side strike-voltage regulation. strike-voltage regulation minimizes corona discharge in the output transformer and related circuitry, providing longer life and higher reliability. fail-safe feature for multiple lamp ap- plications. our multi-output inverters are de- signed to keep your application operating at near normal brightness in the event that a lamp fails. product highlight d irect d rive d ual l amp ccfl i nverter m odule t he i nfinite p ower of i nnovation lxm1620-01 benefits cool operation smooth, easy-to-use brightness control single 12 volt supply lxm1620 "u niversal " m odule c onnection o ptions cn1 cn2 cn3 ccfl lamps desktop display ccfl lamp lxm1620-01 desktop display ccfl lamp cn1 lxm1620-01 cn2 cn3 copyright ? 2000 rev. 0.11 12/03 1 11861 w estern a venue , g arden g rove , ca. 92841, 714-898-8121, f ax : 714-893-2570 l in f inity m icroelectronics i nc . note: for current data & package dimensions, visit our web site: http://www.linfinity.com. dual connector configuration single connector configuration part number lamp run voltage lamp current lxm1620-01 500 - 750v rms 6ma module order information not recommended for new design see lxm1624-12-61 see lxm1624-12-61

lxm1620-01 product databook 1996/1997 cttt urdarbprp9atru/ cb9dabpc cabo this module has been designed to operate over a wide range of input and output conditions. however, best efficiency and performance will be obtained if the module is operated under the condition listed in the ' r.c. ' column. min. and max. columns indicate values beyond which the inverter, although operational, will not function optimally. input supply voltage range (functional) v in input supply voltage (fully regulated lamp current) output power (per lamp) lxm1620-01 p o brightness control input voltage range v brt adj lamp operating voltage lxm1620-01 v lamp lamp current (full brightness - per lamp) i olamp operating ambient temperature range t a parameter symbol units recommended operating conditions min. r.c. max. 10.2 12 16 v 10.2 12 13.8 v 45w 0.0 5.0 v 500 625 750 v rms 6.0 ma rms 070c unless otherwise specified, these specifications apply over the recommended operating conditions and 25c ambient temperature for the lxm1620. full bright lamp current 1620-01 i l (max) v brt adj = 5.0v dc , sleep = high, v in = 12v dc (per lamp) minimum lamp current (per lamp) i l (min) v brt adj = 0v dc , sleep = high, v in = 12v dc (note 2) lamp start voltage v ls 0c < t a < 40c, v in 10.8v dc operating frequency f o v brt adj = 5.0v dc , sleep = high, v in = 12v dc output pin characteristics parameter symbol test conditions units lxm1620-xx min. typ. max. 5.4 6.0 6.6 ma rms 0.5 ma rms 1500 1800 v rms 52 57 62 khz brite input input current i brt v brt adj = 0v dc input voltage for max. lamp current v c i o (lamp) = 100% input voltage for min. lamp current v c i o (lamp) = minimum -6 -8 -10 a dc 5.0 v dc 0v dc 2.2 v in v dc -0.3 0.8 v dc 60 120 180 a dc run mode v sleep (hi) sleep mode v sleep (lo) input current i sleep sleep = 5.0v sleep input note 2. minimum lamp current required to maintain even light output may vary with display panel.
(note 1) input supply voltage (v in ) .............................................................................................................................. .............................. -0.3v to 18v output voltage, no load ............................................................................................................................... ...... internally limited to 1800v rms output current .................................................................................................................................................. 10.0ma rms (internally limited) output power (per lamp) ........................................................................................................................................................................ 6.0w input signal voltage, (sleep and brite inputs) ................................................................................. ......................................... -0.3v to v in ambient operating temperature ............................................................................................................................... ..................... 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 the specified terminal. power characteristics sleep current i in (min) v in = 12v dc , sleep = 0v dc 0150a dc not recommended for new design see lxm1624-12-61

lxm1620-01
3 rev. 0.11 12/03

conn. pin description input power supply. (10.2v v in 16v) power supply return. on/off control. (2.2v < sleep < v in = on, -0.3v < sleep < 0.8v = off) brightness control (-0.3v to 5.0v dc ). 5.0v dc gives maximum lamp current. leave unconnected. '* '$*+ , '& ' - '(*# "" cn1

lxm1620-01 //0) 12123 114 25))6 5.51 (140) 0.94 (24) 0.060 (1.52) max. 0.449 (11.4) max. 0.053 (13.45) ? 0.089 (2.26) grounded mounting hole 2.47 (62.75) cn1 warning!! high voltage present at all output connectors 0.370 (9.4) max. 0.307 (7.8) cn3 cn2 cn2 and cn3: refer to figure 1 not recommended for new design see lxm1624-12-61

lxm1620-01
rev. 0.11 12 /03 4
1 2 3 cn3 3 2 1 cn2 inverter output 2 81 v hi2 v hi1 inverter output 1 cn1 figure 1 ? lxm1620-01 connector schematic
!" !#$" 7&$'#8 129&(8'#:*;<219&'# : 2 5'#*316 4)) 10 0=>,?1 % 7@$5+"6-'-;''- @-;'$ ' connection rules 1. always install two (2) lamps. operating with only one lamp may overdrive lamp current at maximum brightness settings. 2. verify lamp wiring before connecting lamps to the inverter module. connecting both lamps to one of the two inverter output circuits will result in reduced brightness. the lxm1620-01 module connectors are wired per industry standard. the lamp hot wires (high voltage wires) are always on pin 1 or 2, and the cold wire (low voltage wire) is always on pin 3.
our multi-output inverters are designed to keep your application operat- ing at near normal brightness in the event that a lamp fails. this allows the display to remain "on-line" until lamp replacement is convenient. linfinity "pairs" the lamps so that if one lamp in the pair breaks, most of its current is added to the good lamp. ccfls will respond with more brightness for a period of time. operating time in this mode will be a function of the lamps age but should be typically in the order of hundreds of hours. this operating characteristic can provide adequate display perfor- mance for a limited, but useful period of time. shortening of the lamp life in this mode is typically not a concern as it is recommended that all lamps in a display be replaced at the same time. figure 2 ? dual output stage i s lamps not recommended for new design see lxm1624-12-61

lxm1620-01
5 rev. 0.11 12/03 direct drive architecture includes two load feedback control loops to provide uncompromised ccfl ignition and operation characteristics. lamp current is regulated in the ccfl return lead (i sns loop) to insure constant light output with changing lamp parameters and power supply voltage. this also allows accurate and repeatable brightness control. dimming ratio with the lx1620 analog dimming inverters is typically 6:1 when driving dual lcd lamp panels. if no current flows in the ccfl return path because of an unstruck or
lxm1620-xx brite v hi1 v in sleep gnd lamp 1 10.8v dc - 16v dc 10k 5v 0v v lo 5.0v dc v hi2 lamp 2 figure 4 ? potentiometer brightness control figure 3 ? lxm1620 block diagram (only one lamp shown) high voltage transformer i sense lamp 1 v sense sleep transformer driver v hi1 v lo brite gnd controller failed lamp, the inverter applies full strike voltage potential. the output voltage feedback loop (v sns ) takes control and regulates output voltage to 1650v rms . this insures the lamp will ignite under worst case temperature and aging conditions. because output voltage is actively regulated, it will never exceed component and panel insulation ratings. this prevents destructive corona discharge to insure long term reliability of the system. preliminary data - information contained in this document is pre-production data, and is proprietary to linfinity. it may not 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. not recommended for new design see lxm1624-12-61

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