资料介绍
Certain applications, such as file servers, require
redundant cooling fans to ensure uninterrupted system
service, even with cooling fan malfunctions present.
Typically, such systems have a primary fan to cool the
system and one or more “standby” fans that are auto-
matically placed into service should the primary fan fail.
Multiple TC647s can be used to implement such a
system as shown in Figure 1.M AN768
Redundant Fan Systems Using the TC647 Fan Manager
Should a fan fault occur in Unit 1 (fan stops rotating),
Author: Microchip Technology Inc.
the Unit 1 FAULT output will be driven low. This acts to
turn Q2 off, which will activate the TC647 in Unit 2.
INTRODUCTION Unit 2 will now respond to the VIN voltage as long as
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