![]() These devices significantly optimize illumination efficiency at the expense of cost and PCB area due to the use of an inductor BY DARIO NURZAD National Semiconductor Santa Clara, CA The Internet has become the most popular medium for sharing pictures and videos, and for social networking. This has caused a migration to larger-size and higher-resolution color displays, the backlighting of which demands higher power from the battery. White light-emitting-diode (WLED) technology is widely used to provide illumination for the pixels in small-format liquid-crystal displays (LCDs) in battery-powered applications. Figure 1 shows a system-level view of a backlight LED driver that consists of an inductive-boost dc/dc converter and one or more regulated current sinks capable of driving one string of several white LEDs each. Nec usb open host controller drivers for mac. ![]() Load Drivers For Hp Photosmart C4680How much PCB area will be needed? Canon scanner driver for mac download. How is dimming achieved? Canon pixma driver for mac. Answering these questions can guide the designer in the selection of the appropriate backlight LED driver. A backlight LED driver consists of an inductive-boost dc/dc converter, and one or more regulated current sinks capable of driving one string of several white LEDs each. Minimizing inductor size The first aspect to consider, when selecting an LED driver for a battery-powered application, is the total area that the IC driver together with the external components will occupy. A typical solution size for an inductive-boost-based LED driver is close to 30 mm 2 of board area.
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