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• Descargar
  CCD Bias Supply Integrates 'њOutput Disconnect,'ќ Schottkys and Feedback Resistors &mdash LT Journal
  PDF, 257 Kb, Archivo publicado: nov 22, 2006
  Extracto del documento

  DESIGN FEATURES L CCD Bias Supply Integrates
  “Output Disconnect,” Schottkys
  by Jesus Rosales
  and Feedback Resistors
  Introduction CCD Draws High Power
  from Discharged Li-Ion FigureВ 1 shows the LT3487 in a high
  power CCD application that provides
  45mA at 15V and 90mA at –8V from
  a nearly discharged Li-Ion battery at
  3.0V. This power handling allows the
  LT3487 to be used in digital cameras
  with video capability.
  This particular converter operates
  over a wide input voltage range between 2.3V and 16V. Both channels
  run at a 2MHz switching frequency,
  enabling the use of tiny inductors and
  capacitors. The fixed frequency PWM
  control provides outputs with low,
  predictable ripple.
  External components are minimized as both channels incorporate
  on-chip Schottky diodes. Each channel
  also requires only one external resistor
  to set the output voltage. The second …

• Descargar
  J-FET-Based DC/DC Converter Starts and Runs from 300mV Supply &mdash LT Journal
  PDF, 475 Kb, Archivo publicado: nov 22, 2006
  Extracto del documento

  L DESIGN IDEAS J-FET-Based DC/DC Converter Starts
  and Runs from 300mV Supply by Jim Williams
  A J-FET’s self-biasing characteristic
  can be utilized to construct a DC/DC
  converter powered from as little as
  300mV. Solar cells, thermopiles and
  single stage fuel cells, all with outputs below 600mV, are typical power
  sources for such a converter.
  Figure 1, an N-channel J-FET I-V
  plot, shows drain-source conduction
  under zero bias (gate and source tied
  together) conditions. This property can
  be exploited to produce a self-starting
  DC/DC converter that runs from 0.3V
  to 1.6V inputs.
  Figure 2 shows the circuit. Q1 and
  T1 form an oscillator with T1’s secondary providing regenerative feedback
  to Q1’s gate. When power is applied,
  Q1’s gate is at zero volts and its drain
  conducts current via T1’s primary. T1’s
  phase inverting secondary responds by
  going negative at Q1’s gate, turning
  it off. T1’s primary current ceases, …

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Clasificación del fabricante

• Power Management > Switching Regulator > Inverting Regulators | LCD/CCD/OLED Bias
• Power Management > Switching Regulator > Step-Up (Boost) Regulators > Internal Power Switch Boost

Otros nombres:

LT3487EDDTRPBF, LT3487EDD TRPBF