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Notas de aplicación

• Descargar
  Basic Concepts of Linear Regulator and Switching Mode Power Supplies &mdash AN140
  PDF, 715 Kb, Archivo publicado: oct 1, 2013
  Extracto del documento

  Application Note 140
  October 2013
  Basic Concepts of Linear Regulator and Switching
  Mode Power Supplies
  Henry J. Zhang
  ABSTRACT
  This article explains the basic concepts of linear regulators
  and switching mode power supplies (SMPS). It is aimed
  at system engineers who may not be very familiar with
  power supply designs and selection. The basic operating
  principles of linear regulators and SMPS are explained
  and the advantages and disadvantages of each solution
  are discussed. The buck step-down converter is used as
  an example to further explain the design considerations
  of a switching regulator.
  INTRODUCTION
  Today’s designs require an increasing number of power
  rails and supply solutions in electronics systems, with
  loads ranging from a few mA for standby supplies to over
  100A for ASIC voltage regulators. It is important to choose
  the appropriate solution for the targeted application and
  to meet specified performance requirements, such as
  high efficiency, tight printed circuit board (PCB) space, …

Notas de Diseño

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  High Efficiency 4-Switch Buck-Boost Controller Provides Accurate Output Current Limit &mdash DN499
  PDF, 116 Kb, Archivo publicado: feb 22, 2012
  Extracto del documento

  advertisement High Efficiency 4-Switch Buck-Boost Controller Provides
  Accurate Output Current Limit – Design Note 499
  Tage Bjorklund
  Introduction
  A 4-switch buck-boost converter (Figure 1) is often a
  better alternative to a transformer-based topology when
  a converter’s input voltage can be above or below the
  regulated output voltage and isolation is not required.
  A buck-boost converter provides a wider input voltage
  range, better efficiency and has no need of a bulky
  transformer. A buck-boost converter is much more
  efficient than a comparable SEPIC converter.
  The LTC В®3789 is a buck-boost switching regulator
  controller that operates in current mode at a constant
  switching frequency. Current mode control simplifies
  loop compensation and yields excellent load and line
  transient response with only small output and input
  capacitance. Furthermore, an accurate inductor current
  limit allows use of a small size inductor. The LTC3789 includes two internal series regulators that
  provide 5.5V for gate drivers and control circuitry. During
  start-up the current is drawn from VIN (40V maximum
  rating), but switches to EXTVCC (14V maximum rating)
  as soon as the voltage on EXTVCC exceeds 4.8V, to …

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Clasificación del fabricante

• Power Management > Switching Regulator > Buck-Boost Regulators > External Power Switch Buck-Boost

Otros nombres:

LTC3789IUFDPBF, LTC3789IUFD PBF