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Notas de Diseño

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  Simple High Efficiency Isolated Flyback Supply Without Optoisolator &mdash DN1011
  PDF, 107 Kb, Archivo publicado: dic 16, 2005
  Extracto del documento

  advertisement Simple High Efficiency Isolated Flyback Supply Without
  Optoisolator – Design Note 1011
  Ryan Huff
  Introduction
  While simplicity and high efficiency (for cool running) are
  no longer optional features in isolated power supplies, it
  is traditionally difficult to achieve both. Achieving high
  efficiency often requires the use of advanced topologies
  and home-brewed secondary synchronous rectification
  schemes once reserved only for higher power applications. This only adds to the parts count and to the design
  complexity associated with the reference and optocoupler
  circuits typically used to maintain isolation. Fortunately, a
  breakthrough IC makes it possible to achieve both high efficiency and simplicity in a synchronous flyback topology.
  The LT® 3825 simplifies and improves the performance of
  low voltage, high current flyback supplies by providing
  precise synchronous rectifier timing and eliminating the
  need for optocoupler feedback while maintaining excellent
  regulation and superior loop response. current of 12A compares favorably to that of a higher
  parts count forward converter design. This is primarily
  the result of a simple, well-controlled implementation of
  synchronous rectification. Furthermore, due to its high
  efficiency operation, the greatest temperature rise of any
  component is only 60В°C above the ambient temperature …

Artículos

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  Simple, High Efficiency, Multi-Output, Isolated Flyback Supply with Excellent Regulation &mdash LT Journal
  PDF, 96 Kb, Archivo publicado: nov 22, 2006
  Extracto del documento

  L DESIGN IDEAS Simple, High Efficiency, Multi-Output,
  Isolated Flyback Supply with
  by Ryan Huff
  Excellent Regulation
  Introduction accomplished with inefficient, linear
  post regulators or efficient (but relatively expensive) switch-mode buck
  regulator ICs. All of these solutions
  fail the simplicity test in parts count
  and design complexity.
  Fortunately, a breakthrough IC
  makes it possible to achieve high
  efficiency and tight regulation while
  maintaining the simplicity typically Simplicity, tight regulation, and high
  efficiency are no longer optional features in isolated power supplies, but
  achieving all three is traditionally
  difficult. High efficiency often requires
  the use of advanced topologies and
  home-brewed secondary synchronous
  rectification schemes. Tight regulation
  for a multi-output supply is often L1-L2 DO1813P-331HC (COILCRAFT)
  L3: DO1813P-561HC (COILCRAFT)
  Q5: FMMT618 (ZETEX)
  Q6: FMMT718 (ZETEX) …

Linea modelo

Clasificación del fabricante

• Power Management > Switching Regulator > Flyback, Forward and Isolated Controllers

Otros nombres:

LT3825EFETRPBF, LT3825EFE TRPBF