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Design Notes

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  Monitor Network Compliant -48V Power Supplies &mdash DN290
  PDF, 85 Кб, Файл опубликован: 2 июл 2002
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  advertisement Monitor Network Compliant –48V Power Supplies
  Design Note 290
  Brendan Whelan
  Introduction
  Reliability is a top priority for the designers of
  modern telephone and communication equipment.
  Designers take extra care to protect circuitry from
  failure-causing temperature and voltage changes,
  employing redundancy whenever possible, especially
  for power supplies. The power supplies are monitored
  to obtain early warning of impending failure. Often
  complicated circuitry that can include a voltage reference, comparators, voltage regulator and several
  precision resistor dividers is used. Designers may also
  use discrete components to monitor and indicate the
  state of power supply fuses. The resulting circuitry
  can be expensive in terms of component cost, board
  space and engineering time. The LTC В®1921 replaces
  the complicated monitoring circuitry with a simple
  integrated precision monitoring system contained
  entirely in an 8-lead MSOP package.
  Features
  The LTC1921 is the only integrated solution that can
  monitor two independent –48V power supplies, plus …

Статьи

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  -48V Backplane Impedance Analyzer Takes the Guesswork Out of Sizing Clippers and Snubbers &mdash LT Journal
  PDF, 432 Кб, Файл опубликован: 25 мар 2005
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  DESIGN IDEAS –48V Backplane Impedance Analyzer
  Takes the Guesswork Out of Sizing
  by Mitchell Lee
  Clippers and Snubbers
  It comes as something of a surprise to
  most engineers that the –48V power
  distributed on a backplane exhibits
  a decidedly inductive impedance.
  Considering bypass capacitors are
  often excluded from the backplane,
  coupled with the lengthy path back
  to the –48V battery or power supply
  source, it seems unavoidable. The
  consequences of an inductive driving point impedance are twofold: п¬Ѓrst,
  for reasons entirely cosmetic, the
  ringing associated with insertion and
  other transient events are undesirable.
  Second, input reaction to high dI/dt
  conditions presents correspondingly
  high input voltage surges, placing
  the Hot Swap MOSFET as well as the
  operation of the Hot Swap controller
  at risk. To mitigate these effects a network …

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• Monitor, Control and Protection > Hot Swap Controllers > High Voltage Hot Swap Controllers