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Notas de aplicación

• Descargar
  High Voltage, Low Noise, DC/DC Converters &mdash AN118
  PDF, 2.6 Mb, Archivo publicado: marzo 28, 2008
  Photomultipliers (PMT), avalanche photodiodes (APD), ultrasonic transducers, capacitance microphones, radiation detectors and similar devices require high voltage, low current bias. Additionally, the high voltage must be pristinely free of noise; well under a millivolt is a common requirement with a few hundred microvolts sometimes necessary. Normally, switching regulator configurations cannot achieve this performance level without employing special techniques. One aid to achieving low noise is that load currents rarely exceed 5mA. This freedom permits output filtering methods that are usually impractical.
  Extracto del documento

  Application Note 118
  March 2008
  High Voltage, Low Noise, DC/DC Converters
  A Kilovolt with 100 Microvolts of Noise
  Jim Williams This publication describes a variety of circuits featuring
  outputs from 200V to 1000V with output noise below 100ВµV
  measured in a 100MHz bandwidth. Special techniques
  enable this performance, most notably power stages
  optimized to minimize high frequency harmonic content.
  Although sophisticated, all examples presented utilize
  standard, commercially available magnetics—no custom
  components are required. This provision is intended to
  assist the user in quickly arriving at a produceable design.
  Circuits and their descriptions are presented beginning
  with the next ink.
  BEFORE PROCEEDING ANY FURTHER, THE READER
  IS WARNED THAT CAUTION MUST BE USED IN THE
  CONSTRUCTION, TESTING AND USE OF THE TEXT’S
  CIRCUITS. HIGH VOLTAGE, LETHAL POTENTIALS ARE
  PRESENT IN THESE CIRCUITS. EXTREME CAUTION
  MUST BE USED IN WORKING WITH, AND MAKING
  CONNECTIONS TO, THESE CIRCUITS. REPEAT: THESE
  CIRCUITS CONTAIN DANGEROUS, HIGH VOLTAGE …

Notas de Diseño

• Descargar
  3MHz Micropower Synchronous Boost Converters Deliver 3W from Two Cells in a Tiny MSOP Package &mdash DN246
  PDF, 84 Kb, Archivo publicado: dic 2, 2001
  Extracto del documento

  advertisement 3MHz Micropower Synchronous Boost Converters Deliver
  3W from Two Cells in a Tiny MSOP Package
  Design Note 246
  Mark Jordan
  Portable electronic devices operating from one or more
  alkaline or nickel-metal-hydride cells require a boosted
  supply that is both small and efficient. Linear Technology’s new LTC ®3401 and LTC3402 are high frequency
  micropower synchronous boost converters that operate from an input voltage below 1V and deliver up to
  1A of output current from two cells. DC/DC efficiency
  can be as high as 97%. The operating frequency,
  output voltage and Burst Mode В® operation are all
  user programmable, allowing these products to п¬Ѓt in
  various applications where size considerations must
  be balanced against efficiency. Furthermore, all of this
  functionality is packed into a small, thermally enhanced
  MSOP-10 package.
  The LTC3401 is optimized for applications requiring less than 1.5W of total output power from two
  alkaline cells, whereas the LTC3402 is optimized for
  applications requiring 3W or less from two cells.
  High efficiency is achieved through internal features
  such as lossless current sensing, low gate charge,
  low RDS(ON) synchronous power switches (0.16О©
  NMOS, 0.18О© PMOS) and fast switching transitions …

Artículos

• Descargar
  3MHz Synchronous Boost Regulators Save Critical Board Space in Portable Applications &mdash LT Journal
  PDF, 228 Kb, Archivo publicado: nov 1, 2000
  Extracto del documento

  LINEAR TECHNOLOGY
  NOVEMBER 2000 IN THIS ISSUE…
  COVER ARTICLE
  3MHz Synchronous Boost Regulators
  Save Critical Board Space
  in Portable Applications . 1
  Mark Jordan Issue Highlights . 2
  LTCВ® in the News . 2
  DESIGN FEATURES
  SOT-23 10MHz Rail-to-Rail Op Amp
  Saves Board Space and Power . 5
  Glen Brisebois Low Distortion Rail-to-Rail Amplifiers
  Drive ADCs and Cables . 9
  William Jett, Danh Tran and Glen Brisebois Phase-Shift Full-Bridge Controller
  Enables Efficient, Isolated
  Power Conversion for
  High Power Applications . 11
  John Bazinet Zero-Drift Operational Amplifier
  Family in Small-Footprint Packages
  Features 3Вµ V Maximum DC Offset and
  30nV/В°C Maximum Drift . 15
  David Hutchinson Low Dropout Linear Li-Ion Charge
  Controllers Prevent Overcharging, …

Linea modelo

Clasificación del fabricante

• Power Management > Switching Regulator > Step-Up (Boost) Regulators > Micropower Boost | Internal Power Switch Boost

Otros nombres:

LTC3401EMSPBF, LTC3401EMS PBF