How eFuses Strengthen Power-Path Protection For Cooling Fans In AI Servers
by Kshitiz Khatri, Texas Instruments, Karnataka, India, How2Power Today, Apr 15 2025
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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