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Notas de Diseño

• Descargar
  Accurate Power Supply Sequencing Prevents System Damage &mdash DN384
  PDF, 82 Kb, Archivo publicado: enero 11, 2006
  Extracto del documento

  Accurate Power Supply Sequencing Prevents System Damage
  Design Note 384
  Jeff Heath and Akin Kestelli
  Introduction
  Many complex systems—such as telecom equipment,
  memory modules, optical systems, networking equipment, servers and base stations—use FPGAs and other
  digital ICs that require multiple voltage rails that must
  start up and shut down in a specific order, otherwise
  the ICs can be damaged. The LTCВ®2924 is a simple and
  compact solution to power supply sequencing in a 16pin SSOP package (see Figures 1 and 2).
  How it Works
  Four power supplies can be easily sequenced using
  a single LTC2924 and multiple LTC2924s can be just
  as easily cascaded to sequence any number of power
  supplies. With slightly reduced functionality, six power
  supplies can be sequenced with a single LTC2924.
  The LTC2924 controls the start-up and shutdown sequence and ramp rates of four power supply channels
  via output pins (OUT1 to OUT4). Each OUT pin uses a
  10ВµA current source connected to an internal charge
  pump and a low resistance switch to GND. This combination makes the outputs flexible enough to connect
  them directly to many power supply shutdown pins or
  to external N-channel MOSFET switches. The LTC2924 monitors the output voltage of each
  sequenced power supply via four input pins (IN1 to …

Artículos

• Descargar
  Flexible Power Supply Sequencing and Monitoring &mdash LT Journal
  PDF, 491 Kb, Archivo publicado: marzo 25, 2005
  Extracto del documento

  DESIGN FEATURES Flexible Power Supply Sequencing
  by Jeff Heath and Akin Kestelli
  and Monitoring
  Introduction require multiple voltage rails that
  must start up and shut down in a
  specific order, otherwise the ICs can
  be damaged. The LTC2924 is a simple
  and compact solution to power supply
  sequencing in a 16-pin SSOP package
  (see Figure 1).
  Sure, alternative sequencing solutions are available, but few, if any, can The LTC2924 is a complete power supply sequencer and supervisor solution
  for multivoltage-rail systems, such
  as telecommunications equipment,
  memory modules, optical systems,
  networking equipment, servers, and
  base stations. The FPGAs and other
  digital ICs used in these applications
  Q1 1V VON = 0.93V
  VOFF = 0.91V 0.1ВµF
  Q2 3V VON = 2.79V
  VOFF = 2.73V 0.1ВµF
  Q3 5V VON = 4.21V
  VOFF = 3.76V 0.1ВµF 0.1ВµF …

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• Monitor, Control and Protection > Sequencers, Trackers, and Margining Controllers
• Monitor, Control and Protection > Sequencers, Trackers, and Margining Controllers > Power Supply Sequencers > Analog Sequencers