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  Tiny, Efficient High Power LED Camera Flash Solutions for Cell Phone Applications &mdash DN1009
  PDF, 69 Kb, Datei veröffentlicht: Oct 1, 2004
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  advertisement Tiny, Efficient High Power LED Camera Flash Solutions for
  Cell Phone Applications – Design Note 1009
  Keith Szolusha
  Introduction
  Cell phones and PDAs are approaching the limit for small
  form factors, but their feature sets are growing with new
  functions such as built-in cameras and even video cameras.
  The initial in-phone cameras were basic, low resolution devices with little in the way of usable flash capability. However, cell phone camera resolutions have improved and
  sophisticated flash technology is expected to keep pace.
  There are two flash technologies used in digital still cameras. The first uses a Xenon flash lamp to provide a very
  short, high lumen flash with excellent spectral characteristics. LTC offers Xenon photoflash solutions that are
  simple, compact and efficient (see Design Note 345).
  The second flash technology uses LEDs. LED solutions hold
  the upper hand when simplicity and space is at a premium
  and they are the only choice when �torch’ or video-mode
  lighting is required. LED flash units fit into spaces where
  even the smallest Xenon photoflash cannot. Until recently,
  LEDs could not compete with Xenon solutions in light
  output and spectral performance, relegating them to the
  realm of low resolution (sub 1 megapixel) cameras. However, recent (>10Г—) performance improvements have made LEDs an attractive solution for the now popular 1 megapixel
  and higher cell phone cameras.
  Linear Technology offers many simple and extremely
  compact solutions for driving the latest high-light-output LEDs, including Lumileds Luxeon Flash LEDs. These …

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