Datasheet Linear Technology LT3763

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Design Notes

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  60V, Synchronous Step-Down High Current LED Driver &mdash DN508
  PDF, 617 Kb, File published: Oct 9, 2012
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  60V, Synchronous Step-Down High Current LED Driver
  Design Note 508
  Hua (Walker) Bai
  Introduction
  The meaning of the term “high power LED” is rapidly
  evolving. Although a 350mA LED could easily earn the
  stamp of “high power” a few years ago, it could not
  hold a candle to the 20A LED or the 40A laser diodes of
  today. High power LEDs are now used in DLP projectors,
  surgical equipment, stage lighting, automotive lighting
  and other applications traditionally served by high
  intensity bulbs. To meet the light output requirements
  of these applications, high power LEDs are often used
  in series. The problem is that several series-connected
  LEDs require a high voltage LED driver circuit. LED driver
  design is further complicated by applications that require
  fast LED current response to PWM dimming signals. 1) An output voltage regulation loop enables constant
  output voltage operation. This can be used to provide
  open LED protection or charging termination for a
  battery charger.
  2) A second current regulation loop can be used to set
  an input current limit.
  3) An input voltage regulation loop can be used for …

Articles

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  High Power Controller Drives High Power LEDs, Regulates Solar Cells, and Charges Batteries, Steps Down 60V Inputs &mdash LT Journal
  PDF, 3.0 Mb, File published: Apr 10, 2013
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  High Power Controller Drives High Power LEDs,
  Regulates Solar Cells, and Charges Batteries,
  Steps Down 60V Inputs
  Luke Milner The best LED drivers accurately regulate LED current for consistent color reproduction
  and modulate it rapidly for high contrast dimming. They also recognize and
  survive short and open circuits, monitor and report current levels, guard against
  overheating, and protect weak power supplies from excessive load currents. A
  standard switching converter would require a number of additional expensive
  amplifiers, references and passive components to fulfill these responsibilities.
  In contrast, the LT®3763 LED driver-controller has these functions built in—reducing BOM costs, saving board space and
  improving reliability. The LT3763 is more
  than just a high performance LED driver.
  Its rich feature set simplifies the design of
  other demanding applications, such as safe
  charging of a sealed lead-acid batteries, or
  maximum power point regulation for a
  solar panel, or a combination of both. The
  LT3763 performs these tasks with high efficiency, even at input voltages reaching 60V. prevent overshoot and pulls down the
  FAULT pin to mark the occasion.
  The LT3763 is designed to provide flickerfree LED dimming as shown in Figure 2.
  This is achieved by pulling PWMOUT low
  whenever PWM is low and thereby disconnecting the LED, by similarly disconnecting the compensation network at VC , and
  resynchronizing internal switching clocks …

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Manufacturer's Classification

• Power Management > Switching Regulator > Step-Down (Buck) Regulators > High Input Voltage Buck | External Power Switch Buck Controllers
• Power Management > LED Driver ICs > Step-Down (Buck) LED Drivers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) LED Drivers