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Application Notes

• Download
  Current Sense Circuit Collection &mdash AN105
  PDF, 1.1 Mb, File published: Dec 6, 2005
  Sensing and/or controlling current flow is a fundamental requirement in many electronics systems, and the techniques to do so are as diverse as the applications themselves. This Application Note compiles solutions to current sensing problems and organizes the solutions by general application type. These circuits have been culled from a variety of Linear Technology documents.
  Extract from the document

  Application Note 105
  December 2005
  Current Sense Circuit Collection
  Making Sense of Current
  Tim Regan, Jon Munson
  Greg Zimmer, Michael Stokowski
  INTRODUCTION
  Sensing and/or controlling current flow is a fundamental requirement in many electronics systems, and the
  techniques to do so are as diverse as the applications
  themselves. This Application Note compiles solutions to
  current sensing problems and organizes the solutions by
  general application type. These circuits have been culled
  from a variety of Linear Technology documents.
  Circuits Organized by General Application
  Each chapter collects together applications that tend to
  solve a similar general problem, such as high side current sensing, or negative supply sensing. The chapters are titled
  accordingly. In this way, the reader has access to many
  possible solutions to a particular problem in one place.
  It is unlikely that any particular circuit shown will exactly
  meet the requirements for a specific design, but the suggestion of many circuit techniques and devices should
  prove useful. To avoid duplication, circuits relevant to
  multiple chapters may appear in one location.
  L, LT, LTC, LTM, Linear Technology, the Linear logo, Over-The-Top and TimerBlox are …

Design Notes

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  Current Sense Amp Inputs Work from –0.3V to 44V Independent of Supply &mdash DN451
  PDF, 87 Kb, File published: Sep 11, 2008
  Extract from the document

  Current Sense Amp Inputs Work from –0.3V to 44V Independent
  of Supply
  Design Note 451
  Glen Brisebois
  Introduction
  Monitoring current flow in electrical and electromechanical systems is commonly used to provide feedback to
  improve system operation, accelerate fault detection
  and diagnosis, and raise efficiency. A current monitoring
  circuit usually involves placing a sense resistor in series
  with the monitored conductor and determining the voltage
  across the sense resistor. To minimize power loss in the
  sense resistor it is kept as small as possible, resulting
  in a small differential voltage that must be monitored on
  top of what may be a fairly large varying common mode
  voltage. The LT®6105 is an ideal current sense amplifier
  for this application. Just give it any reasonable supply
  voltage, say 3V, and its inputs can monitor small sense
  voltages at common modes of –0.3V to 44V and anything
  in between. The accuracy of the LT6105 over this range
  is displayed in Figure 1.
  L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
  All other trademarks are the property of their respective owners. Solenoid Monitoring
  The large input common mode range of the LT6105 …

Articles

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  Versatile Current Sense Amplifiers Offer Rail-to-Rail Input, 150°C Operating Temperature &mdash LT Journal
  PDF, 329 Kb, File published: Mar 19, 2008
  Extract from the document

  L DESIGN FEATURES Versatile Current Sense Amplifiers
  Offer Rail-to-Rail Input,
  150В°C Operating Temperature
  by William Jett and Glen Brisebois Introduction 24 3V TO 36V RSENSE
  0.02О© RIN
  100О©
  +IN –IN +
  LOAD – V– V+ Q1
  OUT LT6106 ROUT
  1k VOUT
  200mV/A Figure 1. Typical current sense application using the LT6106. Sense resistor is 20mО© and gain is
  10, so transfer function is VOUT/ILOAD = 0.2V/A. SOURCE
  –0.3V TO 44V
  RIN2
  VS+
  100О©
  0.02О© RIN1
  100Ω VS– TO LOAD LT6105
  +IN + –IN VOUT VOUT = 1V/A –
  V+ ROUT
  4.99k V– ( ) VOUT = VS + -VS -R OUT
  RIN
  RIN 1 = RIN 2 = RIN R OUT …

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Manufacturer's Classification

• Signal Conditioning > Amplifiers > Current Sense Amplifiers
• Space & Harsh Environment > Extended Temperature Plastic (H & MP) > Extended Temperature (H & MP) Amplifiers