ML4876

pe mercial Tem Extended Com 0˚C to 70˚C -2 quipment Handheld E for Portable FEATURING rature Range JULY 2000 ML4876* LCD Backlight Lamp Driver with Contrast GENERAL DESCRIPTION The ML4876 is an ideal solution for driving small cold cathode fluorescent tubes (CCFL) used in liquid crystal display (LCD) backlight applications. It provides the dimming ballast control and the contrast control for the LCD display. By utilizing differential drive the ML4876 can deliver the same light output with significantly less input power compared to existing single ended drive schemes. Improvements as high as 30% can be realized when using low power lamps and advanced LCD screen housings. This increased light output is achieved because the differential drive configuration is much less sensitive, and therefore less power is wasted in the capacitive parasitics that exist in the backlight housing. An additional benefit of this configuration is an even distribution of light. The ML4876 is optimized for portable applications where high efficiency is critical to maximize battery life. The high efficiency is achieved by a resonant scheme with zero voltage switching. * THIS PART IS END OF LIFE AS OF JULY 1, 2000 FEATURES s s s s s s s s Backlight lamp driver with differential drive Up to 30% lower power for same light output Low standby current (< 10µA) Improved efficiency (»95%) Allows all N-channel MOSFET drive Low switching losses Resonant threshold detection Buck regulator uses synchronous re...