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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, …

• Descargar
  Modeling and Loop Compensation Design of Switching Mode Power Supplies &mdash AN149
  PDF, 1.4 Mb, Archivo publicado: marzo 23, 2015
  Extracto del documento

  Application Note 149
  January 2015
  Modeling and Loop Compensation Design of
  Switching Mode Power Supplies
  Henry J. Zhang
  Introduction Identifying The Problem Today’s electronic systems are becoming more and more
  complex, with an increasing number of power rails and
  supplies. To achieve optimum power solution density,
  reliability and cost, often system designers need to design
  their own power solutions, instead of just using commercial power supply bricks. Designing and optimizing high
  performance switching mode power supplies is becoming
  a more frequent and challenging task. A well-designed switching mode power supply (SMPS)
  must be quiet, both electrically and acoustically. An undercompensated system may result in unstable operations.
  Typical symptoms of an unstable power supply include:
  audible noise from the magnetic components or ceramic
  capacitors, jittering in the switching waveforms, oscillation
  of output voltage, overheating of power FETs and so on. Power supply loop compensation design is usually
  viewed as a difficult task, especially for inexperienced
  supply designers. Practical compensation design typically
  involves numerous iterations on the value adjustment
  of the compensation components. This is not only time
  consuming, but is also inaccurate in a complicated
  system whose supply bandwidth and stability margin …

Artículos

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  Fast, Accurate Step-Down DC/DC Controller Converts 24V Directly to 1.8V at 2MHz &mdash LT Journal
  PDF, 3.5 Mb, Archivo publicado: oct 11, 2011
  Extracto del documento

  October 2011 I N T H I S I S S U E 2-channel and 4-channel
  pin-selectable I2C
  multiplexer 11 high efficiency power
  supply for Intel IMVP6/6+/6.5 CPUs 20 3A linear regulator easily
  paralleled to spread power
  and heat 24 LTspice IV update 36 frequency shifter for
  isolated PWM control 40 Volume 21 Number 3 Fast, Accurate Step-Down DC/DC
  Controller Converts 24V Directly to
  1.8V at 2MHz
  Bud Abesingha The continuous march in electronics toward lower supply voltages
  and higher load currents puts tremendous pressure on point-ofload DC/DC converters to maintain a fast pace of performance
  improvements. For instance, a lower supply voltage means a
  regulator must support a higher step-down ratio from a 12V
  or 24V power rail while maintaining high efficiency. Regulation
  accuracy also becomes more important as supply voltages
  drop—and accuracy must be maintained in the
  presence of parasitic IR drops and dynamic load
  transients. EMI generated by switching converters
  is also of concern, especially in RF applications.
  Some applications require that their power supplies meet all of these stringent requirements: high power, high efficiency, high accuracy, high stepdown ratio, fast transient performance and low EMI—and that they do
  it in a small footprint. The LTCВ®3833 is a high performance synchronous
  step-down DC/DC controller that steps up to the challenge. Figure 1 shows
  a typical application. The LTC3833 accepts an unregulated input voltage between 4.5V and 38V (40V abs max) and downconverts it to 0.67% …

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Clasificación del fabricante

• Power Management > Switching Regulator > Step-Down (Buck) Regulators > External Power Switch Buck Controllers

Otros nombres:

LTC3833EUDCPBF, LTC3833EUDC PBF