5v Ccfl Inverter Modules Corporation

LXM1597-01 CCFL (cold cathode florescent lamp) Inverter Modules are specifically de- signed for driving LCD back light lamps in applications where dimmability, ultra-high efficiency, high light output, low noise emis- sions, reliable fail safe design, and small form factors are critical parameters. Both mono- chrome 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 pro- vides important new performance advances. 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 radiated noise. This topology simultaneously performs three tasks consisting of line voltage regu- lation, lamp current regulation, and lamp dimming in a single power stage made up of two pairs of low loss FET's. The FET's drive an LC resonant circuit that feeds the primary of a high voltage transformer 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 previous topologies. The full bridge LXM1597-01 is optimized to efficiently operate with up to 4 watt lamps at input voltages of 5 volts. This module will operate over the full 4.5V to 7V input voltage range. By Microsemi Corporation
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