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Notas de aplicación

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  Linear Technology Magazine Circuit Collection, Volume III &mdash AN67
  PDF, 1.2 Mb, Archivo publicado: sept 1, 1996
  Application Note 67 is a collection of circuits for data conversion, interface and signal processing from the first five years of Linear Technology. This application note includes circuits such as fast video multiplexers for high speed video, an ultraselective bandpass filter circuit with adjustable gain, and a fully differential, 8-channel, 12-bit A/D system. The categories included in this app note are data conversion, interface, filters, instrumentation, video/op amps and miscellaneous circuits.
  Extracto del documento

  Application Note 67
  September 1996
  Linear Technology Magazine Circuit Collection, Volume III
  Data Conversion, Interface and Signal Processing
  Richard Markell, Editor
  INTRODUCTION
  Application Note 67 is a collection of circuits from the first
  five years of Linear Technology, targeting data conversion,
  interface and signal processing applications. This
  Application Note includes circuits such as fast video
  multiplexers for high speed video, an ultraselective
  bandpass filter circuit with adjustable gain and a fully differential, 8-channel, 12-bit A/D system. The categories
  included herein are data conversion, interface, filters,
  instrumentation, video/op amps and miscellaneous
  circuits. Application Note 66, which covers power products
  and circuits from Linear Technology ’s first five years, is
  also available from LTC. ARTICLE INDEX
  Data Conversion . 3
  Fully Differential, 8-Channel, 12-Bit A/D System Using the LTCВ®1390 and LTC1410 . 3
  12-Bit DAC Applications . 5
  LTC1329 Micropower, 8-Bit, Current Output DAC Used for Power Supply Adjustment,
  Trimmer Pot Replacement . 7
  12-Bit Cold Junction Compensated, Temperature Control System with Shutdown . 8 …

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  Linear Technology Magazine Circuit Collection, Volume IV &mdash AN84
  PDF, 2.4 Mb, Archivo publicado: abr 1, 2000
  Application Note 84 is a collection of "power circuits" from the years 1996 through 1998 as seen in the pages of Linear Technology magazine. This Application Note collects circuits that can output tens of amps to circuits that can operate a handheld device for several years. In addition to a wide variety of traditional power supply circuits (Buck, Boost, Inverting, Flyback, Linear Regulators, etc.) we include circuits for charging batteries, several Power Management circuits as well as circuits that highlight a very low noise switching regulator.
  Extracto del documento

  Application Note 84
  April 2000 Linear Technology Magazine Circuit Collection, Volume IV
  Power Products
  Richard Markell, Editor
  INTRODUCTION
  Application Note 84 is the fourth in a series that excerpts
  useful circuits from Linear Technology magazine to preserve them for posterity. This application note highlights
  “power” circuits from issue VI:1 (February 1996) through
  issue VIII:4 (November 1998). Another application note
  will feature data conversion, interface and signal processing circuits from the same era. Like its predecessor, AN 66,
  this Application Note includes circuits that can power
  most any system you can imagine, from “server” power
  supplies that generate in excess of 50 amps to micropower systems for portable and handheld equipment.
  Also included are power converters that can be voltage programmed using Intel’s VID code. Charge pump converters, linear regulators and battery charger circuits are
  included here, with Li-Ion batteries receiving extra attention. There are, of course, circuits that cannot be so simply
  categorized. Come browse. I’ll get out of the way and let
  the authors describe their creations.
  Note: Article Titles appear in this application note exactly
  as they originally appeared in Linear Technology magazine. This may result in some inconsistency in the usage
  of terminology. TABLE OF CONTENTS
  Introduction . 1
  REGULATORS—SWITCHING (BUCK)
  New LTCВ®1435–LTC1439 DC/DC Controllers Feature Value and Performance . 4 …

Notas de Diseño

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  New Battery Charger ICs Need No Heat Sinks &mdash DN124
  PDF, 75 Kb, Archivo publicado: marzo 1, 1996
  Extracto del documento

  Fused Lead Battery Charger ICs Need No Heat Sinks
  Design Note 124
  Carl Nelson
  The LT ®1510 and LT1511 are high efficiency batterycharging chips capable of output powers up to 25W and
  50W, respectively. These chips are intended for fastcharging batteries in modern portable equipment where
  space is at a premium. They are therefore packaged in
  low profile surface mount packages and run at a fairly
  high frequency (200kHz) to minimize the height and
  footprint of the complete battery charger. To minimize
  thermal resistance, these packages are specially constructed with the die-attach paddle connected (fused)
  directly to multiple package leads.
  When operating these chips near their maximum
  power levels, extra care should be taken to minimize
  chip power dissipation and to keep the overall thermal
  resistance of the package-board combination as low as
  possible. Figure 1 shows a simple way to reduce power
  dissipation with no loss in performance. The LT1510
  and LT1511 use an external diode (D2) and capacitor
  (CX) to generate a voltage that is higher than the input
  voltage. This voltage is used to supply the base drive
  to the internal NPN power switch to allow it to saturate
  with a forced hFE of about 50. Switching speed and onresistance losses are minimized with this technique. The
  required boost voltage is only 3V, but with the normal …

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  LT1511 Low Dropout, Constant-Current/Constant-Voltage 3A Battery Charger &mdash DN144
  PDF, 80 Kb, Archivo publicado: dic 2, 1996
  Extracto del documento

  Low Dropout, Constant-Current/Constant-Voltage
  3A Battery Charger – Design Note 144
  Chiawei Liao
  Introduction
  The LTВ®1511 current mode PWM battery charger is the
  simplest, most efficient solution for fast charging modern rechargeable batteries that require constant-current
  and/or constant-voltage charging including lithiumion (Li-Ion), nickel-metal-hydride (NiMH) and nickelcadmium (NiCd).
  Higher Duty Cycle for the LT1511 Battery Charger
  Maximum duty cycle for the LT1511 constant-current/
  constant-voltage battery charger is typically 90%, but
  this may be too low for some applications. For example,
  if an 18V В±3% adapter is used to charge ten NiMH cells,
  STANDARD CONNECTION C3
  0.47ОјF
  20ОјH
  D2 SW
  BOOST
  LT1511
  SPIN
  SENSE BAT 200О© 200О©
  VBAT 0.033О© + the charger must put out 15V maximum. A total of 1.6V
  is lost in the input diode, switch resistance, inductor
  resistance and parasitics, so the required duty cycle …

• Descargar
  Inexpensive Circuit Charges Lithium-Ion Cells &mdash DN188
  PDF, 72 Kb, Archivo publicado: sept 1, 1998
  Extracto del documento

  Inexpensive Circuit Charges Lithium-Ion Cells – Design Note 188
  David Bell
  Introduction
  A single Lithium-Ion cell is often the battery of choice
  for portable equipment because of its high energy
  density. The 3V to 4.1V provided by a Lithium-Ion cell
  is also a good match for modern low voltage circuits,
  often simplifying the power supply. Despite these
  advantages, designers are often frustrated when attempting to design precision charging circuitry that
  meets battery manufacturers’ specifications. Figure 2
  is a simple, cost-effective linear charger that satisfies
  these precision Lithium-Ion charging requirements.
  Lithium-Ion cell manufacturers generally recommend
  a constant-current/constant-voltage (CC/CV) charging
  technique. Although conceptually simple, charging a
  Lithium-Ion cell requires very accurate control of the
  float voltage to obtain high capacity with long cycle
  life. If the voltage is too low, the cell will not be fully
  charged; if the voltage is too high, the cycle life is significantly degraded. Excessive voltage to the cell can
  also result in venting and other hazardous conditions
  (specific hazards depend upon the cell’s construction
  and chemistry).
  Figure 1 depicts CC/CV charging characteristics for …

• Descargar
  New Charger Topology Maximizes Battery Charging Speed &mdash DN194
  PDF, 96 Kb, Archivo publicado: nov 2, 1998
  Extracto del documento

  New Charger Topology Maximizes Battery Charging Speed
  Design Note 194
  Fran Hoffart
  Introduction
  Battery charging in notebook computers and other portable products generally involves compromises. A notebook computer’s AC adapter is usually sized to charge the
  battery at its maximum rate when the computer is off. In
  this condition, the computer draws essentially no power,
  so the full capacity of the adapter can be used for charging
  the battery. However, when the computer is turned on,
  charging current is usually reduced to a low rate to avoid
  overloading the AC adapter. You can use your computer
  or fast charge your battery, but not both at the same time.
  Linear Technology has developed a new battery charger
  topology that maximizes the battery charging rate, even
  when the computer is on, without increasing the size
  or capacity of the AC adapter power source. Instead of
  simply reducing the charging current to an arbitrarily
  low level, the charger monitors the current drawn from
  the AC adapter and automatically reduces the charging
  current only when necessary to avoid overloading the
  AC adapter. At all other times, the charging current can
  be at the maximum programmed value if the battery
  demands it. Since average notebook power consumption is considerably lower than peak demand, battery …

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  Li-Ion Charge Termination IC Interfaces with PWM Switchers &mdash DN242
  PDF, 74 Kb, Archivo publicado: oct 2, 2001
  Extracto del documento

  Li-Ion Charge Termination IC Interfaces with PWM Switchers
  Design Note 242
  Fran Hoffart
  Rechargeable lithium-ion batteries are rapidly becoming the battery of choice for many battery-powered
  products. These products include notebook computers, PDAs, video camcorders, digital cameras, cellular
  phones, portable test equipment and others. Compared
  to other rechargeable power sources, Li-Ion batteries
  have higher energy density for both weight and volume
  and provide longer run time between charges. tery from overtemperature and overcurrent conditions.
  In addition, battery packs may also contain back-toback MOSFET switches that disconnect the battery if
  an overcurrent condition exists for either charge or
  discharge, or if an overvoltage or undervoltage condition exists. Many of these precautions are needed
  because lithium-ion cells are easily damaged by both
  overcharge and overdischarge conditions. Charging Li-Ion batteries is a relatively simple process.
  Apply a current-limited (at a 1C rate) constant voltage
  (В±1% tolerance) for approximately three hours, then
  stop charging. (C is a battery term used to indicate
  the Ampere-hour capacity of a battery). A complete
  charge cycle may also include precharge qualification
  for battery temperature and precharge qualification for
  deeply discharged batteries. LTВ®1510 Battery Charger IC
  The LT1510 is a high efficiency switching regulator
  power IC designed speciп¬Ѓcally for battery charging …

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• Power Management > Battery Management > Battery Charger IC > Switching Battery Chargers