Controller IC Implements Compact, Power-Saving Solution For Hot-Swapping And Active ORing In Telecom Systems

by Dongming Liu, Maxim Integrated, San Jose, Calif., How2Power Today, Mar 15 2014

Focus:
A telecom system is a multicard application with embedded microprocessor-based cards plugged into the backplane. Once up and running, these cards are not supposed to be powered down for service or repair. All updates can only be done by hot-swapping the cards in and out without powering down the entire system. A telecom system also uses redundant power supplies to ensure reliability and therefore requires ORing of power supply outputs. This article introduces a high-integration hot-swap and ORing controller (the MAX5944). The operation of this controller IC is explained and measurements demonstrating its performance are presented. The article begins by reviewing why hot swap control is needed and why active OR’ing is preferred over diode-based OR’ing when connecting power supplies for redundancy.

What you’ll learn:

• How to achieve a more integrated solution for hot swapping and activing ORing in telecom systems

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