Datasheet Linear Technology LT3782A — Даташит

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Design Notes

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  Low Profile Synchronous, 2-Phase Boost Converter Produces 200W with 98% Efficiency &mdash DN455
  PDF, 112 Кб, Файл опубликован: 3 окт 2008
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  advertisement Low Profile Synchronous, 2-Phase Boost Converter Produces
  200W with 98% Efficiency – Design Note 455
  by Victor Khasiev
  Introduction
  Automotive audio amplifiers require a high power boost
  converter that is both efficient and compact. High
  efficiency is essential to keep dissipated heat low and
  avoid bulky and expensive heat sinks. The LT3782A
  is a 2-phase synchronous PWM controller, making
  it possible to produce a low profile, high power boost
  supply that achieves 98% efficiency. Output power is 200W continuous and 250W for short
  pulse loads, corresponding to 8.5A continuous current
  and 10.5A pulsed current.
  This circuit comprises three major sections. Two are
  the phase-interleaved power trains, and the third is
  the control circuit.
  Each power train includes an inductor, two switching
  MOSFETs, a synchronous MOSFET and an output
  capacitive п¬Ѓlter. The output п¬Ѓlters are connected
  together in parallel. Schottky diodes D1 and D2 increase
  efficiency during the dead time. A 24V Output Boost Converter at 8.5A
  (Continuous), 10.5A (Peak) from a Car Battery
  Figure 1 shows a boost converter that generates …

Статьи

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  High Power 2-Phase Synchronous Boost Replaces Hot Diodes with Cool FETs-No Heat Sinks Required &mdash LT Journal
  PDF, 574 Кб, Файл опубликован: 1 янв 2009
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  DESIGN IDEAS L High Power 2-Phase Synchronous
  Boost Replaces Hot Diodes with
  Cool FETs—No Heat Sinks Required
  by Narayan Raja, Tuan Nguyen and Theo Phillips Introduction
  For low power designs, non-synchronous boost converters offer a simple
  solution. However, as power levels increase, the heat dissipated in the boost
  diode becomes a significant design
  problem. In such cases, a synchro-nous boost converter, with the diode
  replaced with a lower forward voltage
  drop switch, significantly improves efficiency and relieves many issues with
  thermal layout. Although the topology
  is more complicated, Linear Technol5V ogy offers controller ICs that simplify
  the design of high power synchronous
  boost applications. The LT3782A boost
  controller, for instance, includes predrive outputs for external synchronous
  switch drivers. It also integrates strong PD3S160
  Q1
  VCC 1ВµF GND LTC4440-5 IN
  4.7ВµF
  VIN
  10V TO 14V + 680ВµF 1ВµF TG
  DFLS160 TS SGATE1 10ВµF
  s4 BST L1 …

Модельный ряд

Классификация производителя

• Power Management > Switching Regulator > Step-Up (Boost) Regulators > External Power Switch Boost