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  12V/100A Hot Swap Design for Server Farms &mdash LT Journal
  PDF, 264 Kb, File published: Oct 27, 2014
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  12V/100A Hot Swap Design for Server Farms
  Dan Eddleman As data centers servicing the cloud grow in speed and capacity, backplane supplies
  are called on to deliver currents that push the performance boundaries of Hot Swap
  components. Hot Swap solutions allow boards to be inserted and removed from a live
  backplane without disturbing the power distributed to other boards. A typical Hot Swap
  solution uses a series MOSFET to manage the flow of power between the backplane and
  the board—preventing glitches and faults from disrupting power to the rest of the system.
  The challenges of designing robust Hot
  Swap solutions multiply with increasing
  current demands. With load currents at
  100A, simply determining power dissipation requirements is no longer sufficient.
  Designers must pay careful attention to
  the MOSFET safe operating area (SOA) and
  understand Kelvin current sensing techniques for multiple sense resistors. This
  article shows how to address these issues
  using the example of a 12V/100A solution
  based on the LTC4218 Hot Swap controller. resistance is low during start-up (such as
  might occur during an output short-circuit
  fault), the LTC4218 detects this condition and turns off the series MOSFET.
  During start-up, the circuit’s current
  limit threshold is reduced by pulling
  the LTC4218’s ISET pin low through R4
  until the PG signal transitions high. R4’s RSENSE RESISTOR ARRAY …

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Manufacturer's Classification

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

Other Names:

LTC4218CGNPBF, LTC4218CGN PBF