Datasheet Linear Technology LTC1909-8 — Даташит

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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 …

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  Microprocessor Core Supply Voltage Set by I2C Bus Without VID Lines &mdash DN279
  PDF, 75 Кб, Файл опубликован: 1 мар 2002
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  advertisement Microprocessor Core Supply Voltage Set by I2C Bus
  without VID Lines – Design Note 279
  Mark Gurries
  Introduction
  Many modern CPUs run at two different clock speeds,
  where each speed requires a different core operating
  voltage to assure optimum performance. These voltages
  are documented in the manufacturer’s VID (voltage
  identification) section of the CPU specification. Some
  new DC/DC converters (the LTCВ®1909, for example) have
  built-in VID control that supports dual programmable
  output voltages, but many existing converters do not.
  The LTC1699 is a precision 2-state resistive divider that
  uses a simple SMBus interface to allow VID control on
  non-VID-enabled DC/DC converters. No dedicated VID
  lines are required.
  How it Works
  DC/DC converters maintain consistent output voltage
  by comparing the output voltage, through an accurate
  voltage divider, against an internal reference and adjusting the output to compensate for differences. The
  LTC1699 is a 2-state resistive divider that replaces the
  п¬Ѓxed voltage divider in the feedback circuit, thus allowing the circuit to support two different voltage outputs.
  It is speciп¬Ѓcally designed to work with DC/DC PWM …

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Классификация производителя

• Power Management > Switching Regulator > Digitally Programmable Regulators