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Design Notes

• Скачать
  Design Guidelines for CompactPCI Hot Swap Control Applications Using the LTC1644 &mdash Design Solutions 12
  PDF, 132 Кб, Файл опубликован: 1 май 2003
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  Design Solutions 12
  May 2003
  Design Guidelines for CompactPCI Hot Swap Control
  Applications Using the LTC1644
  by Andy Gardner
  Introduction Long and Medium Power Pin Connections The LTCВ®1644 is designed for CompactPCITM Hot SwapTM
  control applications requiring –12V, 5V, 3.3V and 12V
  supplies (see Figure 1). The LTC1644 also precharges the
  bus I/O pins during hot insertion and extraction, feeds
  back the status of the back-end supply voltages with its
  PWRGD output, and intercepts the PCI_RST# signal onchip using the RESETIN and RESETOUT pins. There are
  several important considerations in circuit design and
  component selection for CompactPCI Hot Swap control
  applications using the LTC1644. CompactPCI connectors have both long and medium
  length GND, 5V, 3.3V and VI/O power pins as well as
  medium length –12V and 12V power pins. In general,
  medium length power pins are used for “Back End Power
  Planes” where the connector pins are isolated from the
  load by the LTC1644. The long connector pins may be
  used to provide “Early Power” to loads that require power
  immediately upon hot insertion without the benefit of BACKPLANE
  CONNECTOR C8
  0.01ВµF …

Статьи

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  CompactPCI Hot Swap Controllers with Bus Precharge, On-Chip Intercept of PCI Reset Signal and Much More &mdash LT Journal
  PDF, 175 Кб, Файл опубликован: 1 дек 2001
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  DESIGN FEATURES CompactPCI Hot Swap Controllers
  with Bus Precharge, On-Chip Intercept
  of PCI Reset Signal and Much More
  by Andrew Gardner
  Introduction
  When a circuit board is inserted into
  a “hot” (powered) backplane, its supply bypass capacitors can draw large
  currents from the backplane power
  bus as they charge. These currents
  can cause glitches on the backplane
  supply voltage, resetting other boards
  in the system, and can even damage
  edge connectors. The LTC1644 and
  LTC1646 Hot Swapв„ў controllers
  safely limit these charging currents
  during board insertion into a hot backplane. They also offer several features
  specifically tailored for CompactPCIв„ў
  (CPCI) Hot Swap applications: R2
  0.007Ω
  1% 5VIN MED 5V
  LONG 5V R1
  0.005Ω, 1% 3VIN MED 3.3V
  LONG 3.3V LONG V(I/O) V(I/O) MED –12V SHORT BD_SEL# CompactPCI CONNECTOR D1 R4 …

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• Monitor, Control and Protection > Hot Swap Controllers > PCI Hot Swap Controllers | Low Voltage Hot Swap Controllers