Chapter 259

A 24V/48V Hot Swap controller

Robert Reay

Abstract

A 24V/48V Hot Swap controller is described.

Keywords

Hot Swap controller

LT1641

As supply voltages continue to drop, designers face the difficult task of minimizing the voltage drops through a distributed power system. Designers are leaning toward distributing power at a higher voltage, commonly 24V/48V, then stepping down the voltage on each board in the system to the final desired value using power modules.

Most power modules require an input bypass capacitor that is typically hundreds of microfarads in value. When the board is hot-plugged into a live power rail, the input capacitor can draw huge inrush currents as it charges. The inrush current can cause permanent damage ...

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