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Notas de Diseño

• Descargar
  Active Voltage Positioning Reduces Output Capacitors &mdash Design Solutions 10
  PDF, 130 Kb, Archivo publicado: nov 1, 1999
  Extracto del documento

  Design Solutions 10
  November 1999
  Active Voltage Positioning Reduces Output Capacitors
  by Robert Sheehan
  INTRODUCTION
  Power supply performance, especially transient response,
  is key to meeting today’s demands for low voltage, high
  current microprocessor power. In an effort to minimize
  the voltage deviation during a load step, a technique that
  has recently been coined “active voltage positioning” is
  generating substantial interest and gaining popularity in
  the portable computer market. The benefits include lower
  peak-to-peak output voltage deviation for a given load
  step, without having to increase the output filter capacitance. Alternatively, the output filter capacitance can be
  reduced while maintaining the same peak-to-peak transient response.
  BASIC PRINCIPLE
  The term “active voltage positioning” (AVP) refers to
  setting the power supply output voltage at a point that is
  dependent on the load current. At minimum load, the
  output voltage is set to a slightly higher than nominal level.
  At full load, the output voltage is set to a slightly lower than
  nominal level. Effectively, the DC load regulation is
  degraded, but the load transient voltage deviation will be …

• Descargar
  Cost Effective, Low Profile, High Efficiency 42A Supply Powers AMD Hammer Processors &mdash DN285
  PDF, 85 Kb, Archivo publicado: mayo 2, 2002
  Extracto del documento

  advertisement Cost Effective, Low Profile, High Efficiency 42A Supply Powers
  AMD Hammer Processors – Design Note 285
  Henry J. Zhang and Wei Chen
  Introduction
  The new AMD Hammer processors require power supplies that can deliver more than 40A current at very
  low output voltages (0.8V to 1.55V). The LTC В®3719
  PolyPhaseВ® controller meets these requirements. The
  LTC3719 is a current mode, 2-phase VID programmable
  controller that drives two synchronous buck stages
  180 degrees out of phase of each other. The 2-phase
  architecture reduces the number of input and output
  capacitors without increasing the switching frequency.
  The relatively low switching frequency, along with integrated high current MOSFET drivers keeps efficiency
  high and solution size small. the required input and output capacitance, the controller
  switching frequency can be synchronized to the external
  switching signal from another LTC PolyPhase controller, thus increasing the number of DC/DC converter
  phases. To ensure that current is equally shared among
  the output phases, the inductor current is sensed with
  current sensing resistors. Excellent current sharing
  eliminates the potential thermal overstress problem
  caused by unbalanced phase current. Therefore, the
  MOSFETs and inductors need not be oversized and
  the VRM can be operated reliably without heat sink. …

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Clasificación del fabricante

• Power Management > Switching Regulator > Digitally Programmable Regulators