《TI magnetic and piezoelectric transformer in CCFL application》.pdf

《TI magnetic and piezoelectric transformer in CCFL application》.pdf

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Power Management Texas Instruments Incorporated Comparing magnetic and piezoelectric transformer approaches in CCFL applications By Eddy Wells Power Management Products Systems Specialist Cold cathode fluorescent lamps (CCFLs) are commonly Figure 1. Typical voltage and current used as a backlight source for color liquid crystal displays behavior in a CCFL (LCDs) used in notebook computers and portable elec- tronic devices. These lamps require a high ac voltage for ignition and operation. The required ignition voltage is typically double the operating voltage and increases at cold 3-mm-Diameter Lamp VI Characteristics temperatures. Figure 1 shows the operating voltage of 800 lamps with 3-mm diameters and various lengths (100 mm, 250 mm 150 mm, and 250 mm). Lamp voltage is primarily dependent 600 ) on length and is fairly constant with current, giving a non- V ( e 150 mm linear characteristic. Lamp current is roughly proportional g a t l 400 to brightness or intensity and is the cont

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