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Notas de aplicación

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  New Linear Regulators Solve Old Problems &mdash AN142
  PDF, 106 Kb, Archivo publicado: nov 7, 2013
  Extracto del documento

  Application Note 142
  August 2013
  New Linear Regulators Solve Old Problems
  Bob Dobkin, Vice President, Engineering and CTO, Linear Technology Corp.
  Regulators regulate but are capable of doing much more.
  The architecture of linear regulators has remained virtually
  unchanged since the introduction of the three terminal
  floating voltage regulator in 1976. Regulators were either
  a floating architecture (LTВ®317) or else an amplifier loop
  with feedback from the output to the amplifier. Both of
  these architectures suffer from limitations on versatility,
  regulation and accuracy.
  The feedback resistors set the output voltage and
  attenuate the feedback signal into the amplifier. Therefore
  the regulation at the output is a percentage of the output
  voltage, so higher output voltages have worse regulation
  in “Volts” while the percentage may be the same. Also, the
  bandwidth of the regulator changes with voltage. Since the
  loop gain is decreased, the bandwidth is decreased as well
  at higher output voltages. This makes transient response
  slower and ripple worse as output voltage goes up. The regulator fixes current limiting and it has no adjustment. It is built into the IC and different devices must be
  used for different output currents. So, if the current limit
  needs to be matched to the application or accurate current …

Artículos

• Descargar
  High Performance Portable DC Bench Power Supply: Save Money and Free Up Bench Real Estate by Building Your Own &mdash LT Journal
  PDF, 1.8 Mb, Archivo publicado: jul 1, 2014
  Extracto del documento

  High Performance Portable DC Bench Power Supply:
  Save Money and Free Up Bench Real Estate by
  Building Your Own
  Keith Szolusha The bench power supply, along with the soldering iron and
  handheld multimeter, is a required item in any electronics
  lab toolbox. Some projects require only a single, constant
  voltage supply, but more often, properly testing and
  debugging a project demands a variety of voltages and
  currents. Significant debugging time can be saved by
  using a high performance adjustable bench supply to
  dial in voltage and current at will. Unfortunately, typical
  universal adjustable bench power supplies are bulky and
  expensive—at least the better-performing versions—and
  have a number of limitations. None are truly portable
  (handheld) due to necessary heat dissipation structures.
  Furthermore, even high cost supplies do not support zero
  current or voltage, and cannot match the transient and
  short performance exhibited by the supply shown here.
  Linear Technology’s demonstration circuit
  DC2132A is a high performance, compact,
  efficient DC bench supply Save money and free up benchtop space
  by building your own high quality bench
  power supply. The key component to …

• Descargar
  New Linear Regulators Solve Old Problems &mdash LT Journal
  PDF, 807 Kb, Archivo publicado: enero 6, 2014
  Extracto del documento

  January 2014 I N T H I S I S S U E ВµModuleВ® regulator
  combines a switcher with
  five 1.1A LDOs 12 Volume 23 Number 4 New Linear Regulators
  Solve Old Problems
  Bob Dobkin fully differential op amp
  drives high res ADCs 14 Silent Switcherв„ў regulator
  meets CISPR Class 5 25 high speed ADC sampling
  transients 34 The architecture of linear regulators has remained virtually
  unchanged since the introduction of the 3-terminal floating
  voltage regulator in 1976. Architectures have settled on either the
  floating architecture (LT317) or an amplifier loop with feedback
  from the output to the amplifier. These architectures inherently
  limit regulator versatility, regulation and accuracy. In 2007, Linear
  Technology released the LTВ®3080, introducing a new linear regulator
  architecture that expanded versatility,
  significantly improved performance,
  and allowed easy parallel operation.
  The LT3081 is one of this new
  class of linear regulator, specifically
  featuring a wide safe operating
  area for industrial applications.
  THE OLD WAY In the old linear regulator architecture (Figure 1),
  feedback resistors set the output voltage and attenuate …

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Clasificación del fabricante

• Power Management > LDO Linear Regulators > Positive Linear Regulators (LDO) | LDO Plus | Extended Temperature (H & MP) Linear Regulators
• Monitor, Control and Protection > Cable Drop Compensation