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• Descargar
  Linear Technology Magazine Circuit Collection, Volume II &mdash AN66
  PDF, 1.1 Mb, Archivo publicado: agosto 1, 1996
  Application Note 66 is a compendium of "power circuits" from the first five years of Linear Technology. This application note contains circuits that can power most any system you can imagine, from desktop computer systems to micropower systems for portable and handheld equipment. Also included here are circuits that provide 300W or more of power factor corrected DC from a universal input. Battery chargers are included, some that charge several battery types, some that are optimized to charge a single type. MOSFET drivers, high side switches and H-bridge driver circuits are also included, as is an article on simple thermal analysis.
  Extracto del documento

  Application Note 66
  August 1996 Linear Technology Magazine Circuit Collection, Volume II
  Power Products
  Richard Markell, Editor
  INTRODUCTION
  Application Note 66 is a compendium of “power circuits”
  from the first five years of Linear Technology. The objective
  is to collect the useful circuits from the magazine into
  several applications notes (another, AN67, will collect
  signal processing circuits into one Application Note) so
  that valuable “gems” will not be lost. This Application Note
  contains circuits that can power most any system you can
  imagine, from desktop computer systems to micropower
  systems for portable and handheld equipment. Also included here are circuits that provide 300W or more of
  power factor corrected DC from a universal input. Battery
  chargers are included, some that charge several battery
  types, some that are optimized to charge a single type.
  MOSFET drivers, high side switches and H-bridge driver
  circuits are also included, as is an article on simple thermal
  analysis. With these introductory remarks, I’ll stand aside
  and let the authors describe their circuits. ARTICLE INDEX
  REGULATORS—SWITCHING (BUCK)
  High Power (>4A) …

Notas de Diseño

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  LT1580 Fast Response Low Dropout Regulator Achieves 0.4 Dropout at 4 Amps &mdash DN119
  PDF, 100 Kb, Archivo publicado: dic 1, 1995
  Extracto del documento

  advertisement Fast Response Low Dropout Regulator Achieves 0.4 Dropout
  at 4 Amps – Design Note 119
  Craig Varga
  Low dropout regulators have become more common
  in desktop computer systems as microprocessor
  manufacturers have moved away from 5V only CPUs.
  A wide range of supply requirements exists today with
  new voltages just over the horizon. In many cases, the
  input-output differential is very small, effectively disqualifying many of the low-dropout regulators on the
  market today. Several manufacturers have chosen to
  achieve lower dropout by using PNP-based regulators.
  The drawbacks of this approach include much larger die
  size, inferior line rejection and poor transient response.
  Enter the LTВ®1580
  The new LT1580 NPN regulator is designed to make use
  of the higher supply voltages already present in most
  systems. The higher voltage source is used to provide
  power for the control circuitry and supply the drive
  current to the NPN output transistor. This allows the
  NPN to be driven into saturation, thereby reducing the
  dropout voltage by a VBE compared to a conventional
  design. Applications for the LT1580 include 3.3V to
  2.5V conversion with a 5V control supply, 5V to 4.2V …

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  Dual Regulators Power PentiumВ® Processor or Upgrade CPU &mdash DN122
  PDF, 73 Kb, Archivo publicado: feb 1, 1996
  Extracto del documento

  advertisement Dual Regulators Power Pentium Processor or Upgrade CPU
  Design Note 122
  Craig Varga
  Many manufacturers of Pentium processor-based
  motherboards have been searching for an economical
  solution to the problem of powering the present generation Pentium P54C and accommodating the upgrade
  processors that will soon become available. The existing
  processor uses a single supply for both the processor
  core and the I/O. For the highest frequency offerings,
  the supply required is 3.5V ±100mV (VRE specification).
  For the lower performance end of the clock frequency
  spectrum, a supply voltage of 3.3V В±5% is adequate.
  Recently, Intel respecified the standard 3.3V CPUs for
  operation at 3.5V. This allows designs for any clock
  frequency to be operated from a single 3.5V supply. The
  I/O ring and chipset should be powered by the same
  voltage as the CPU core, whether that is 3.3V or 3.5V.
  The P55C upgrade processor, which will soon be available, requires separate supplies for the core and the I/O.
  The nominal core voltage is targeted at 2.500V В±5%,
  whereas the I/O supply is still nominally 3.3V. There is
  also a processor pin, VCC2DET, at location AL1, that is
  bonded to ground on the P55C, but is open on the P54C.
  A signiп¬Ѓcant complication is introduced by the core …

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  Very Low Dropout (VLDO) Linear Regulators Supply Low Voltage Outputs &mdash DN292
  PDF, 106 Kb, Archivo publicado: agosto 2, 2002
  Extracto del documento

  advertisement Very Low Dropout (VLDO) Linear Regulators Supply
  Low Voltage Outputs
  Design Note 292
  Tom Gross
  Introduction
  With each new generation of computing systems, total
  power continues to increase while system voltages
  fall. CPU core voltages and logic supplies below 1.8V
  are now commonplace. Power supplies must not only
  regulate low output voltages but they must also operate
  from low input voltages. A low voltage, low dropout
  linear regulator is an attractive conversion option for
  applications where output currents are in the several
  ampere range. Component count and cost are low in
  comparison to switching regulator solutions, and with
  low input-to-output voltage differentials, efficiencies
  are comparable. MOSFET controller/driver are devices well suited to
  deliver lower output voltages from a supply of 1.8V
  or lower. Each device offers excellent line/load regulation, temperature performance and transient load
  step response.
  Figure 1 illustrates the LT1580 delivering 1.3V at 3A
  (maximum), from a 1.8V input supply. This particular
  conп¬Ѓguration requires a higher voltage supply to bias …

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