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  Offline LED Lighting Simplified: High Power Factor, Isolated LED Driver Needs No Opto-Isolators and is TRIAC Dimmer Compatible &mdash DN490
  PDF, 125 Kb, Archivo publicado: marzo 18, 2011
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  Offline LED Lighting Simplified: High Power Factor, Isolated
  LED Driver Needs No Opto-Isolators and is TRIAC Dimmer
  Compatible – Design Note 490
  Wei Gu
  Introduction
  As environmental concerns over traditional lighting increase and the price of LEDs decreases, high power LEDs
  are fast becoming a popular lighting solution for offline
  applications. In order to meet the requirements of offline
  lighting—such as high power factor, high efficiency, isolation and TRIAC dimmer compatibility—prior LED drivers
  used many external discrete components, resulting in
  cumbersome solutions. The LTВ®3799 solves complexity,
  space and performance problems by integrating all the
  required functions for offline LED lighting. opto-coupler. Its unique bleeder circuit makes the LED
  driver compatible with TRIAC dimmers without additional
  components. Open-and shorted-LED protection ensures
  long term reliability.
  No-Opto Operation
  Figure 1 shows a complete LED driver solution. The LT3799
  senses the output current from the primary side switch
  current waveform. For a flyback converter operating in
  boundary mode, the equation for the output current is:
  IOUT = 0.5 IPK N (1 – D)
  IPK is the peak switch current, N is the primary to secondary turns ratio and D is the duty cycle. The IC regulates The LT3799 controls an isolated flyback converter in …

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Clasificación del fabricante

• Power Management > LED Driver ICs > Offline LED Drivers
• Power Management > Power Control > Offline Controllers/PFC

Otros nombres:

LT3799EMSEPBF, LT3799EMSE PBF