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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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  LT1510 Design Manual &mdash AN68
  PDF, 377 Kb, Archivo publicado: dic 30, 1996
  The ever-growing popularity of portable equipment in recent years has pushed battery technologists to search for battery types that store more energy in a smaller volume, weigh less and are safer. Also, the power source selection for charging the batteries has diversified. For example, a notebook computer can be connected to a car battery, a power adapter, a docking station or even to solar cells. The variety of input voltages, coupled with the need for high efficiency and the need for accurate constant voltage and constant current, as in the case of Li-Ion batteries (see below), have led to the introduction of a switching type constant-voltage, constant-current battery charger IC, the LT®1510.
  Extracto del documento

  Application Note 68
  December 1996
  LT1510 Design Manual
  Applications Engineering Staff INTRODUCTION
  The ever-growing popularity of portable equipment in
  recent years has pushed battery technologists to search
  for battery types that store more energy in a smaller
  volume, weigh less and are safer. Also, the power source
  selection for charging the batteries has diversified. For
  example, a notebook computer can be connected to a
  car battery, a power adapter, a docking station or even to
  solar cells.
  The variety of input voltages, coupled with the need for
  high efficiency and the need for accurate constant voltage
  and constant current, as in the case of Li-Ion batteries (see
  below), have led to the introduction of a switching type
  constant-voltage, constant-current battery charger IC, the
  LTВ®1510.
  Being a switching regulator, the LT1510 can operate over
  a large range of input voltages, up to 28V, with efficiency
  in the 90% range. Because the LT1510 operates in current
  mode, its output performance is not affected by input
  voltage changes. An important feature of the LT1510 is its constant-current …

Notas de Diseño

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  LT1510 High Efficiency Lithium-Ion Battery Charger &mdash DN111
  PDF, 77 Kb, Archivo publicado: sept 1, 1995
  Extracto del documento

  High Efficiency Lithium-Ion Battery Charger
  Design Note 111
  Chiawei Liao Lithium-Ion Battery Charger
  The circuit in Figure 1 uses the 16-lead LT1510 to charge
  lithium-ion batteries at a constant 1.3A until battery
  voltage reaches 8.4V set by R3 and R4. The charger
  will then automatically go into a constant voltage mode
  with current decreasing toward near zero over time as
  the battery reaches full charge. This is the normal regimen for lithium-ion charging, with the charger holding
  the battery at “float” voltage indefinitely. In this case,
  no external sensing of full charge is needed. Figure 2
  shows typical charging characteristics.
  The battery DC charging current is programmed by a
  resistor RPROG ( or a DAC output current) at the PROG pin.
  High DC accuracy is achieved with averaging capacitor
  CPROG. The basic formula for full charging current is:
  IBAT = (IPROG)(2000) = (2.465/RPROG)(2000)
  = (2.465/3.83k)(2000) = 1.3A Approximately 0.25mA flows out of the BAT pin at
  all times when adapter power is applied. Therefore,
  09/95/111_conv SW VCC + 0.22ОјF
  BOOST
  L1
  33ОјH D2 …

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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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  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 …

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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