Hot swap for blade server

Much of the infrastructure that runs our 24/7 online world is made up of rack-based 12 V server systems that are permanently live. So the boards and components that drive these systems must be able to be ‘hot-swapped’ to allow for upgrades and maintenance without ever needing to power down the equipment.

Block diagram

Design considerations

  • When a board is plugged into a live system, it is important the in-rush current is carefully controlled to protect the components on the board and ensure other parts of the system do not experience any power disruption.
  • MOSFETs with a strong linear mode performance and wide safe operating area (SOA) are required to manage this current effectively and reliably
  • Once the replacement board is safely installed, the MOSFET is turned fully ON. In this mode of operation, a low RDS(on) value is of primary importance, helping to keep temperatures down and system efficiency at a maximum

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