How eFuses Strengthen Power-Path Protection For Cooling Fans In AI Servers

Focus:

Fans in server racks are transitioning to higher voltage rails (48 V) to accommodate increased cooling requirements. These fans, in turn, necessitate higher-rated eFuses, such as the TPS1685 (48 V, 20 A) for power path protection. This article discusses the requirements for fan-based cooling in AI server racks and the role of eFuses in protecting the fans against overcurrent, overvoltage and overtemperature events. Among the eFuse features that are beneficial in enterprise server cooling is a user-defined blanking timer, which protects against transient overcurrent conditions. The operation of this feature and how to configure it are explained.

What you’ll learn:

• How to protect cooling fans against overcurrent, overvoltage and overtemperature events using eFuses
• How to implement the blanking feature in the TPS1685 eFuse

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Author & Publication:

Kshitiz Khatri, Texas Instruments, Karnataka, India, How2Power Today, Apr 15 2025

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