MOSFET Selection Guide for Telecom-Server Hot Swap Applications

Hot swap circuits are predominately used in high-availability systems, such as servers, so that the operation will not beinterrupted if there is a need to expand or repair the sub-circuits of the system. The hot swapping often involves a large transient current (up to hundreds of amperes) to charge the output capacitors, which require a robust MOSFET with a large SOA capability during the linear operating mode. For discrete passive hot swap circuits,no controller is present to lower the overall cost. However, for high power and high redundancy critical telecom-server applications, usually, there is a need for hot swap controller to regulate the inrush transient current. this application note will evaluate the MOSFET behaviors among AOS and other competitors parts based on 12V ADM1278 hot swap circuits from ADI.
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