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Notas de Diseño

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  High Power Desktop LCD Backlight Controller Supports Wide Dimming Ratios While Maximizing Lamp Lifetime &mdash DN264
  PDF, 79 Kb, Archivo publicado: agosto 1, 2001
  Extracto del documento

  High Power Desktop LCD Backlight Controller Supports Wide
  Dimming Ratios While Maximizing Lamp Lifetime – Design Note 264
  Rich Philpott
  Introduction
  Liquid crystal displays (LCDs), long standard in laptop
  computers and handheld instruments, are gaining
  in popularity as desktop computer displays. Larger
  displays require multiple high power cold cathode
  fluorescent lamps (CCFLs). The lamps must have a
  dimming range and life expectancy comparable to
  those of previous generations of desktop displays. To
  achieve maximum lamp lifetime and dimming range
  while maintaining efficiency, CCFL drive should be
  sinusoidal, contain zero DC component, and not exceed
  the CCFL manufacturer’s current ratings. Providing a
  low crest-factor sinusoidal CCFL drive also maximizes
  current-to-light conversion efficiency, reduces display
  flicker and minimizes EMI and RFI emissions. The
  LTВ®1768 high power CCFL controller, with its unique
  Multimode Dimming, provides the necessary drive to
  enable a wide dimming range, while maximizing lamp
  lifetime. LT1768 Dual CCFL Backlight Inverter
  The circuit in Figure 1 is a dual, grounded-lamp backlight inverter that operates from an input of 9V to 24V, …

Artículos

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  High Power Desktop CCFL Controller Enables Wide Dimming Ratios while Maximizing Lamp Lifetime &mdash LT Journal
  PDF, 156 Kb, Archivo publicado: mayo 1, 2001
  Extracto del documento

  DESIGN FEATURES High Power Desktop CCFL Controller
  Enables Wide Dimming Ratios while
  by Rich Philpott
  Maximizing Lamp Lifetime
  LT1768 Dual CCFL
  Liquid crystal displays (LCDs), long from 200V to 800V. A CCFL can oper-Backlight Inverter
  Introduction standard in laptop computers and
  handheld instruments, are gaining in
  popularity as desktop computer displays. In the larger sizes required for
  desktop monitor applications, providing uniform backlighting for LCDs
  requires multiple, high power lamps.
  In addition, the lamps must have a
  dimming range and life expectancy
  comparable to those of previous generations of desktop displays. Cold
  cathode fluorescent lamps (CCFLs)
  provide the highest available efficiency
  for backlighting LCD displays. The
  CCFL requires a high voltage supply
  for operation. Typically, over 1000
  volts is required to initiate CCFL
  operation, with sustaining voltages ate from DC, but migration effects
  damage the CCFL and shorten its
  lifetime. To achieve maximum life, …

Linea modelo

Clasificación del fabricante

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

Otros nombres:

LT1768IGNTRPBF, LT1768IGN TRPBF