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Artículos

• Descargar
  LED Driver with Integrated Spread Spectrum Reduces EMI without Adding Flicker (LT3795) &mdash LT Journal
  PDF, 3.2 Mb, Archivo publicado: oct 9, 2013
  Extracto del documento

  LED Driver with Integrated Spread Spectrum
  Reduces EMI without Adding Flicker
  Keith Szolusha Automotive LED drivers should be compact, efficient and support flicker-free PWM
  dimming. They should not produce significant conducted EMI at and around the AM
  radio band. Unfortunately, low EMI is not in the nature of high power switch mode power
  supplies—the constant switching frequency produces a significant EMI signature at a
  number of frequencies, including the power supply’s fundamental operating frequency
  and its harmonics. Odds are good that something will fall into the AM band.
  One way to minimize EMI peaks is to
  allow the switch mode power supply
  (SMPS) operating frequency to cover a
  range of values, namely spread spectrum
  switching. The desired effect of spread
  spectrum switching is to push down VIN
  8V TO 60V
  100V TRANSIENT L2
  4.7ВµH
  2.2ВµF
  100V OPTIONAL
  EMI FILTER the EMI peaks that would occur at the
  SMPS fundamental operating frequency
  and harmonics, spreading the EMI energy
  over a range of frequencies instead. RINSNS …

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  One LED Driver Is All You Need for Automotive LED Headlight Clusters (LT3795) &mdash LT Journal
  PDF, 762 Kb, Archivo publicado: jul 7, 2015
  Extracto del documento

  design features One LED Driver Is All You Need for Automotive LED Headlight
  Clusters
  Keith Szolusha and Kyle Lawrence Low beam headlights, high beam headlights, daytime running lights and signal lights are
  often fashioned together in a single unit or cluster, allowing designers to produce distinctive
  automotive front end looks. LED lighting has found its way into these clusters, distinguishing
  the high end faces of today’s luxury vehicles; but LEDs offer more than just good looks.
  They have a number of technical advantages over competing lighting technologies—notably
  improved efficiency, robustness and lifetime. Despite these advantages, automobile
  lighting designers are challenged by the cost of replacing traditional lamps with LEDs.
  A significant portion of the cost LED
  lighting is driven by the costs of the
  LEDs themselves, thermal management
  assemblies (such as finned metal heat
  sinks) and robust LED driver circuits.
  Traditionally, each LED beam or light
  type would require its own LED driver
  PCB. Costs and complexity can be significantly reduced if a single driver is used to drive multiple LED strings (in
  series) within the lighting cluster.
  A comprehensive, multi-LED-string driver
  must support the high voltages and high
  currents required by high power LED
  strings. It must also deftly handle the
  on/off transitions of some LED strings …

Linea modelo

Clasificación del fabricante

• Power Management > LED Driver ICs > Step-Up (Boost) LED Drivers | Step-Down (Buck) LED Drivers | Buck-Boost LED Drivers | Multitopology LED Driver
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) LED Drivers