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Medium size backlight NCP5050: Drive up to 120 LEDs

Posted: 24 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:CCFL lamps? LCD panels? backlight?

CCFL lamps have been commonly used for backlighting medium sized 5-inch to 10-inch LCD panels in applications such as portable DVD players, electronic picture frames, and GPS navigation systems. As white LEDs efficiency continues to improve rapidly, they are now displacing CCFL for these panel sizes. White LED backlighting is attractive since it can result in thinner and lighter products. In addition since LEDs are more efficient they can improve battery life while offering a wider dimming range over CCFL lamps. This application note illustrates how the NCP5050 white LED driver can be configured to drive multiple LED strings for LCD backlighting and how to expand the output voltage rating beyond its 20V rating to drive 6 LED to 10 LEDs in series.

In addition, this application note highlights how the NCP5050 can be easily configured to operate from 2 cell Li-Ion batteries, NiMH battery packs, or from a 12V automotive adapter.

Please view the PDF document for more information.

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