Wide Input Ccfl Inverter Modules Corporation

LXM1596-01 CCFL (cold cathode florescent lamp) Inverter Modules are specifically de- signed for driving LCD back light lamps in applications where dimmability, ultrahigh efficiency, high light output, low noise emissions, reliable fail safe design, and small form factors are critical parameters. Both monochrome and color Displays are supported. The modules convert unregulated DC voltage from the system battery or AC adapter directly to high-frequency, high- voltage sine waves required to ignite and operate CCFL lamps. The module design is based on a proprietary Linfinity IC that provides important new performance ad- vances. Remarkable improvements in efficiency and RF emissions result from its single stage resonant inverter featuring a patent pend- ing Current Synchronous, Zero Voltage Switching (CS-ZVS) topology. CS-ZVS pro- duces nearly pure sine wave currents in the lamp enabling maximum light delivery while reducing both conducted and radi- ated noise. This topology simultaneously performs three tasks consisting of line volt- age regulation, lamp current regulation, and lamp dimming in a single power stage made up of one pair of low loss FET's. The FET's drive an LC resonant circuit that feeds the primary of a high voltage trans- former with a sinusoidal voltage. Required L and C values in the resonant circuit are such that very low loss compo- nents CAN be used to obtain higher electri- cal efficiency than is possible with previ- ous topologies. The half bridge LXM1596-01 is optimized to efficiently operate with up to 4 watt lamps over the full 7V to 30V input volt- age range. By Microsemi Corporation
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