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LT1017 LT1017

Application Notes

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  Designing Linear Circuits for 5V Single Supply Operation &mdash AN11
  PDF, 230 Кб, Файл опубликован: 1 сен 1985
  This note covers the considerations for designing precision linear circuits which must operate from a single 5V supply. Applications include various transducer signal conditioners, instrumentation amplifiers, controllers and isolated data converters.
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  Application Note 11
  September 1985
  Designing Linear Circuits for 5V Single Supply Operation
  Jim Williams
  In predominantly digital systems it is often necessary
  to include linear circuit functions. Traditionally, separate
  power supplies have been used to run the linear components (see Box, “Linear Power Supplies—Past, Present,
  and Future”).
  Recently, there has been increasing interest in powering
  linear circuits directly from the 5V logic rail. The logic
  rail is a difficult place for analog components to function.
  The high amplitude broadband current and voltage noise
  generated by logic clocking makes analog circuit operation difficult. (See Box, “Using Logic Supplies for Linear
  Functions”.)
  Generally speaking, analog circuitry which must achieve
  very high performance levels should be driven from dedicated supplies. The difficulties encountered in maintaining
  the lowest possible levels of noise and drift in an analog
  system are challenging enough without contending with
  a digitally corrupted power supply.
  Many analog applications, however, can be successfully
  implemented using the logic supply. Combining components intended to provide high performance from the 167Ω Q1 –
  + 2M L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
  Technology Corporation. All other trademarks are the property of their respective owners. RATIOMETRIC …

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  Circuitry for Single Cell Operation &mdash AN15
  PDF, 195 Кб, Файл опубликован: 1 ноя 1985
  1.5V powered circuits for complex linear functions are detailed. Designs include a V/F converter, a 10-bit A/D, sample-hold amplifiers, a switching regulator and other circuits. Also included is a section of component considerations for 1.5V powered linear circuits.
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  Application Note 15
  November 1985
  Circuitry for Single Cell Operation
  Jim Williams
  Portable, battery-powered operation of electronic apparatus has become increasingly desirable. Medical, remote
  data acquisition, power monitoring and other applications
  are good candidates for battery operation. In some circumstances, due to space, power or reliability considerations,
  it is preferable to operate the circuitry from a single 1.5V
  cell. Unfortunately, a 1.5V supply eliminates almost all
  linear ICs as design candidates. In fact, the LM10 op
  amp-reference and the LTВ®1017/LT1018 comparators are
  the only IC gain blocks fully specified for 1.5V operation.
  Further complications are presented by the 600mV drop
  of silicon transistors and diodes. This limitation consumes
  a substantial portion of available supply range, making
  circuit design difficult. Additionally, any circuit designed
  for 1.5V operation must function at end-of-life battery
  voltage, typically 1.3V. (See Box Section, “Components
  for 1.5V Operation.”)
  500k
  10kHz
  TRIM
  EIN …

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  Power Gain Stages for Monolithic Amplifiers &mdash AN18
  PDF, 2.5 Мб, Файл опубликован: 1 мар 1986
  This note presents output state circuits which provide power gain for monolithic amplifiers. The circuits feature voltage gain, current gain, or both. Eleven designs are shown, and performance is summarized. A generalized method for frequency compensation appears in a separate section.
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  Application Note 18
  March 1986
  Power Gain Stages for Monolithic Amplifiers
  Jim Williams
  Most monolithic amplifiers cannot supply more than a few
  hundred milliwatts of output power. Standard IC processing
  techniques set device supply levels at 36V, limiting available output swing. Additionally, supplying currents beyond
  tens of milliamperes requires large output transistors and
  causes undesirable IC power dissipation.
  Many applications, however, require greater output power
  than most monolithic amplifiers will deliver. When voltage
  or current gain (or both) is needed, a separate output
  stage is necessary. The power gain stage, sometimes
  called a “booster”, is usually placed within the monolithic
  amplifier’s feedback loop, preserving the IC’s low drift and
  stable gain characteristics. 150mA Output Stage
  Figure 1a shows the LTВ®1010 monolithic 150mA current
  booster placed within the feedback loop of a fast FET
  amplifier. At lower frequencies, the buffer is within the
  feedback loop so that its offset voltage and gain errors
  are negligible. At higher frequencies, feedback is through
  Cf, so that phase shift from the load capacitance acting
  against the buffer output resistance does not cause loop …

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  Performance Enhancement Techniques for Three-Terminal Regulators &mdash AN2
  PDF, 975 Кб, Файл опубликован: 2 авг 1984
  This application note describes a number of enhancement circuit techniques used with existing 3-terminal regulators which extend current capability, limit power dissipation, provide high voltage output, operate from 110VAC or 220VAC without the need to switch transformer windings, and many other usefu application ideas.
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  Application Note 2
  August 1984
  Performance Enhancement Techniques for
  Three-Terminal Regulators
  Jim Williams
  Three terminal regulators provide a simple, effective solution to voltage regulation requirements. In many situations
  the regulator can be used with no special considerations.
  Some applications, however, require special techniques
  to enhance the performance of the device.
  Probably the most common modification involves extending the output current of regulators. Conceptually, the
  simplest way to do this is by paralleling devices. In practice,
  the voltage output tolerance of the regulators can cause
  problems. Figure 1 shows a way to use two regulators to
  achieve an output current equal to their sum. This circuit
  capitalizes on the 1% output tolerance of the specified
  regulators to achieve a simple paralleled configuration.
  Both regulators sense from the same divider string and
  the small value resistors provide ballast to account for the
  slightly differing output voltages. This added impedance
  degrades total circuit regulation to about 1%. Figure 2 shows another way to extend current capability
  in a regulator. Although this circuit is more complex than
  Figure 1, it eliminates the ballasting resistor’s effects
  and has a fast-acting logic-controlled shutdown feature. …

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  A Monolithic IC for 100MHz RMS-DC Conversion &mdash AN22
  PDF, 3.3 Мб, Файл опубликован: 1 сен 1987
  AN22 details the theoretical and application aspects of the LT1088 thermal RMS/DC converter. The basic theory behind thermal RMS/DC conversion is discussed and design details of the LT1088 are presented. Circuitry for RMS/DC converters, wideband input buffers and heater protection is shown.
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  Micropower Circuits for Signal Conditioning &mdash AN23
  PDF, 2.2 Мб, Файл опубликован: 1 апр 1987
  Low power operation of electronic apparatus has become increasingly desirable. AN23 describes a variety of low power circuits for transducer signal conditioning. Also included are designs for data converters and switching regulators. Three appended sections discuss guidelines for micropower design, strobed power operation and effects of test equipment on micropower circuits.
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  Application Note 23
  April 1987
  Micropower Circuits for Signal Conditioning
  Jim Williams
  Low power operation of electronic apparatus has become
  increasingly desirable. Medical, remote data acquisition,
  power monitoring and other applications are good candidates for battery driven, low power operation. Micropower
  analog circuits for transducer-based signal conditioning
  present a special class of problems. Although micropower
  ICs are available, the interconnection of these devices to
  form a functioning micropower circuit requires care. (See
  Box Sections, “Some Guidelines for Micropower Design
  and an Example” and “Parasitic Effects of Test Equipment
  on Micropower Circuits.”) In particular, trade-offs between
  signal levels and power dissipation become painful when
  performance in the 10-bit to 12-bit area is desirable. Additionally, many transducers and analog signals produce +V inherently small outputs, making micropower requirements complicate an already difficult situation. Despite the
  problems, design of such circuits is possible by combining
  high performance micropower ICs with appropriate circuit
  techniques.
  Platinum RTD Signal Conditioner
  Figure 1 shows a simple circuit for signal conditioning
  a platinum RTD. Correction for the platinum sensor’s
  nonlinear response is included. Accuracy is 0.25В°C over …

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  Some Thoughts on DC-DC Converters &mdash AN29
  PDF, 1.2 Мб, Файл опубликован: 1 окт 1988
  This note examines a wide range of DC/DC converter applications. Single inductor, transformer, and switched-capacitor converter designs are shown. Special topics like low noise, high efficiency, low quiescent current, high voltage, and wide-input voltage range converters are covered. Appended sections explain some fundamental properties of different types of converters.
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  Application Note 29
  October 1988
  Some Thoughts on DC/DC Converters
  Jim Williams and Brian Huffman
  INTRODUCTION
  Many systems require that the primary source of DC power
  be converted to other voltages. Battery driven circuitry is
  an obvious candidate. The 6V or 12V cell in a laptop computer must be converted to different potentials needed for
  memory, disc drives, display and operating logic. In theory,
  AC line powered systems should not need DC/DC converters
  because the implied power transformer can be equipped
  with multiple secondaries. In practice, economics, noise
  requirements, supply bus distribution problems and other
  constraints often make DC/DC conversion preferable. A
  common example is logic dominated, 5V powered systems
  utilizing В±15V driven analog components.
  The range of applications for DC/DC converters is large,
  with many variations. Interest in converters is commensurately quite high. Increased use of single supply powered
  systems, stiffening performance requirements and battery
  operation have increased converter usage.
  Historically, efficiency and size have received heavy emphasis. In fact, these parameters can be significant, but
  often are of secondary importance. A possible reason
  behind the continued and overwhelming attention to size …

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  Switching Regulator Circuit Collection &mdash AN30
  PDF, 606 Кб, Файл опубликован: 1 фев 1989
  Switching regulators are of universal interest. Linear Technology has made a major effort to address this topic. A catalog of circuits has been compiled so that a design engineer can swiftly determine which converter type is best. This catalog serves as a visual index to be browsed through for a specific or general interest.
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  Application Note 30
  February 1989
  Switching Regulator Circuit Collection
  John Seago
  Switching regulators are of universal interest. Linear
  Technology has made a major effort to address this topic.
  A catalog of circuits has been compiled so that a design
  engineer can swiftly determine which converter type is
  best. This catalog serves as a visual index to be browsed
  through for a specific or general interest. The catalog is organized so that converter topologies can
  be easily found. There are 12 basic circuit categories:
  Battery, Boost, Buck, Buck-Boost, Flyback, Forward, High
  Voltage, Multioutput, Off Line, Preregulator, Switched
  Capacitor and Telecom. Additional circuit information can
  be located in the references listed in the index. The
  reference works as follows, i.e., AN8, Page 2 = Application
  Note 8, Page 2; LTC1044 DS = LTC1044 data sheet;
  DN17 = Design Note 17. DRAWING INDEX
  FIGURE TITLE FIGURE # PAGE REFERENCE/SOURCE Battery
  2A Converter with 150ВµA Quiescent Current (6V to 12V)
  200mA Output Converter (1.5V to 5V)
  Up Converter (6V to 15V)
  Regulated Up Converter (5V to 10V) …

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  Linear Circuits for Digital Systems &mdash AN31
  PDF, 1.5 Мб, Файл опубликован: 2 фев 1989
  Subtitled "Some Affable Analogs for Digital Devotees," discusses a number of analog circuits useful in predominantly digital systems. VPP generators for flash memories receive extensive treatment. Other examples include a current loop transmitter, dropout detectors, power management circuits, and clocks.
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  Techniques for 92% Efficient LCD Illumination &mdash AN55
  PDF, 688 Кб, Файл опубликован: 1 авг 1993
  This publication details several LCD backlight circuits which feature 92% efficiency. Other benefits include low voltage operation, synchronizing capability, higher output power for color displays, and extended dimming range. Extensive coverage of practical issues includes layout problems, multi-lamp displays, safety and reliability concerns and efficiency and photometric measurements. Also included is a review of circuits which did not work along with appropriate commentary.
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  Application Note 55
  August 1993
  Techniques for 92% Efficient LCD Illumination
  Waste Not, Want Not .
  Jim Williams
  INTRODUCTION
  In August of 1992 LTC published Application Note 49,
  “Illumination Circuitry for Liquid Crystal Displays.” One
  notable aspect of this event is that it generated more
  response than all previous LTC application notes combined. This level of interest, along with significant performance advances since AN-49’s appearance, justifies
  further discussion of LCD backlighting circuitry.
  This publication includes pertinent information from the
  previous effort in addition to updated sections and a large
  body of new material. The partial repetition is a small
  penalty compared to the benefits of text flow, completeness and time efficient communication. The most noteworthy performance advance is achievement of 92%
  efficiency for the backlight power supply. Additional new
  benefits include low voltage operation, synchronizing capability, higher output power for color displays, and extended dimming range.
  A practical 92% efficient LCD backlight design is a classic
  study of compromise in a transduced electronic system.
  Every aspect of the design is interrelated, and the physical
  embodiment is an integral part of the electrical circuit. The
  choice and location of the lamp, wires, display housing
  and other items has a major effect on electrical characteristics. The greatest care in every detail is required to …

Design Notes

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  A 4-Cell Ni-Cad Regulator/Charger for Notebook Computers &mdash DN54
  PDF, 77 Кб, Файл опубликован: 1 ноя 1991
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  A 4-Cell Ni-Cad Regulator/Charger for
  Notebook Computers -Design Note 54
  Tim Skovmand
  pack can be used to power a 5V notebook computer
  system. Inexpensive N-channel power MOSFETs have
  very low on resistance and can be used to switch power
  with low voltage drop between the battery pack and the
  5V logic circuits. The new LTC В®1155 dual power MOSFET driver delivers
  12V of gate drive to two N-channel power MOSFETs
  when powered from a 5V supply with no external
  components required. This ability, coupled with its
  micropower current demands and protection features,
  makes it an excellent choice for high side switching
  applications which previously required more expensive
  P-channel MOSFETs. Figure 1 shows how a battery charger and an extremely
  low voltage drop 5V regulator can be built using the
  new LTC1155 and three inexpensive power MOSFETs. A notebook computer power supply system is a good
  example of an application which benefits directly from
  this high side driving scheme. A 4-cell, Ni-Cad battery L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
  of Linear Technology Corporation. All other trademarks are the property of their
  respective owners. %
  .#3 7
  "
  $633&/5 …

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• Signal Conditioning > Comparators > Micropower Comparators

Варианты написания:

LT1018CSWPBF, LT1018CSW PBF