Datasheet Linear Technology LTC3711 — Даташит

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Экологический статус

Design Notes

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  Active Voltage Positioning Reduces Output Capacitors &mdash Design Solutions 10
  PDF, 130 Кб, Файл опубликован: 1 ноя 1999
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  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 …

Статьи

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  New No Rsense Controllers Deliver Very Low Output Voltages &mdash LT Journal
  PDF, 182 Кб, Файл опубликован: 1 фев 2001
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  DESIGN FEATURES New No RSENSE Controllers Deliver Very
  Low Output Voltages by Christopher B. Umminger
  Valley Current Control
  Digital system voltages are dropping of very high efficiency DC/DC step-Enables tON(MIN) < 100ns
  Introduction ever lower, yet battery voltages are
  not. This forces DC/DC step-down
  converters in portable products to
  operate at lower duty cycles. Unfortunately, low duty cycle operation
  decreases efficiency due to both
  increased switching losses and the
  increased importance of I2R losses at
  low output voltages. Furthermore,
  conventional control architectures
  often have difficulty operating with
  very short switch on-times. The
  LTC1778 and LTC3711 with VID
  address these problems with a new
  architecture for buck regulators that
  delivers the low output voltages and
  high efficiencies that modern portable supplies require.
  The LTC1778 is a step-down controller that provides synchronous
  drive for two external N-channel
  MOSFET switches. It comes with a …

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Классификация производителя

• Power Management > Switching Regulator > Digitally Programmable Regulators