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  An Efficient and Low Cost Alternative to LEDs for Backlighting Handheld Computer Displays &mdash DN1004
  PDF, 96 Kb, Datei veröffentlicht: Feb 1, 2004
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  advertisement An Efficient and Low Cost Alternative to LEDs for Backlighting
  Handheld Computer Displays – Design Note 1004
  David Canny
  Introduction
  The backlight for a handheld computer’s liquid crystal
  display should be efficient, compact and inexpensive. The
  two primary competing backlight solutions, white LEDs
  and Cold Cathode Floresent Lamps (CCFLs), satisfy some
  of these requirements but neither excel in all. Of these two,
  white LEDs have recently gained popularity because of
  their smaller size and easier-to-design controller circuits—important during the technology boom when timeto-market often took precedence over cost and product
  performance. CCFL solutions, however, continue to have
  advantages, including better efficiency (resulting in longer
  battery run times) and lower overall production costs.
  Furthermore, recent advancements in CCFL drivers and
  changes in the market have given CCFLs the advantage in
  many applications. One of the most significant changes is
  the rise in the importance of cost cutting where inexpensive CCFL solutions have always held the upper hand over
  comparable LED circuits. This, plus easier-to-design and
  more compact CCFL solutions, have made CCFL solutions
  more desirable. A Compact CCFL Circuit
  The circuit shown in Figure 1 is specifically designed to
  control a single 1W CCFL. T1, Q1, Q2 and associated …

Artikel

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  A Compact and Power Efficient CCFL Controller for Handheld Devices &mdash LT Journal
  PDF, 71 Kb, Datei veröffentlicht: Feb 1, 2004
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  DESIGN IDEAS A Compact and Power Efficient CCFL
  Controller for Handheld Devices
  by David Canny
  Cold Cathode Fluorescent Lamps
  (CCFLs) offer the highest available
  efficiency for backlighting an LCD
  display, making them a popular choice for handheld devices. The
  CCFL controller must also be efficient
  to conserve battery power, and small,
  to fit in the tight spaces required by 6
  1 10 R1
  330Ω
  1/4W VIN
  2.7V TO 5.5V 5 T1 4 2 3 C2
  Q1 0.15ВµF Q2 R2
  200k C1
  27pF
  1.5kV CCFL
  LAMP L1
  33ВµF VIN 0VSEN SW
  Li-Ion R4
  1M SHDN
  LTC1697 …

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• Power Management > Switching Regulator > LCD/CCD/OLED Bias

Andere Namen:

LTC1697EMSTRPBF, LTC1697EMS TRPBF