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Design Notes

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  Simple Battery Circuit Extends Power over Ethernet (PoE) Peak Current &mdash DN361
  PDF, 82 Кб, Файл опубликован: 17 фев 2005
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  Simple Battery Circuit Extends Power over Ethernet (POE)
  Peak Current – Design Note 361
  Mark Gurries
  Introduction
  Power over Ethernet (PoE) is a new development that allows for the delivery of power to Ethernet-based devices
  via standard Ethernet CAT5 cable, precluding the need
  for wall adapters or other external power sources. The
  PoE specification defines a hardware detection protocol
  where Power Sourcing Equipment (PSE) is able to identify
  PoE Powered Devices (PDs), thus allowing full backwards
  compatibility with non-PoE-aware (legacy) Ethernet devices. The PoE specification also sets an upper limit
  on the power that can be drawn by a PD. The problem
  is: what happens when a PD must draw more power
  than allowed by the PoE standard? Examples may be
  the spin up of a disk drive or a period of sustained
  transmission of data from an RF transmitter. If the
  average power load of these applications is less than
  L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks
  and PowerPath is a trademark of Linear Technology Corporation. All other
  trademarks are the property of their respective owners. L1
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Статьи

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  Simplify PoE Implementation with Complete PD Interface and Integrated Switching Regulator &mdash LT Journal
  PDF, 188 Кб, Файл опубликован: 25 мар 2005
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  DESIGN FEATURES Simplify PoE Implementation
  with Complete PD Interface and
  Integrated Switching Regulator
  Introduction
  IEEE 802.3af Power over Ethernet
  (PoE) is a standard for delivering power
  over Cat-5 cables, eliminating the
  need for AC-adapters for equipment
  plugged into the Ethernet. The two
  major components in a PoE system
  are Power Sourcing Equipment (PSE),
  which deliver power, and Powered Devices (PD), which receive and use the
  power. A PSE will not deliver power to
  the load unless it detects a valid signature resistance, which distinguishes a
  compliant PD from a device that cannot
  receive power. Once the PD receives
  power, it must also convert the –48V
  PoE efficiently to a suitable power
  supply voltage. Typical PD designs
  employ two ICs for these tasks. An
  obvious way to simplify PD designs
  would be to integrate the interface
  and DC-DC conversion circuitry into …

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Классификация производителя

• Monitor, Control and Protection > Power-over-Ethernet (PoE) Interface Controllers > PoE Powered Device (PD)