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

Highlighted components are Nexperia focus products

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 enhanced 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

Understanding MOSFET datasheet parameters – Quick Learning

Join Stein as he talks through a 36V e-fuse application where RDS(on) and VDS are important but they’re not as critical as other parameters, such as ID, SOA and avalanche capability, as well as highlighting the importance of application requirement in MOSFET choice.

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