Fan speed control and monitoring can ease some of these headaches, resulting in quieter, more reliable fans that use less power. Unfortunately with fan use comes the usual fan headaches of mechanical failures, increased power consumption, and more noise. For many applications, this means using fans.
IntroductionĪs IC designers strive to put more transistors running at higher speeds into smaller packages, there can be only one outcome: heat! Couple this with the fact that these high-power ICs are being designed into ever-shrinking boxes, and you end up with a real thermal management problem. This document discusses the operation of the MAX6650 and MAX6651, two fan controllers with linear closed-loop fan speed control.Ī similar version of this article appeared in the Septemissue of EDN. In addition, a fan that is about to fail can be identified so that it can be replaced before it fails. When fan control is augmented by fan-speed monitoring, a speed-control loop can be implemented that is independent of manufacturing variances and wear on the fan. Temperature-based fan control is a necessity in a growing number of systems, both to reduce system noise and to improve fan reliability.
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