This app note describes how to control the speed of a small fan, like those in a computer case:
Controlling the speed of a brushless DC cooling fan is discussed. Examples of discrete and IC fan-speed controllers are shown. The article presents 12V, 24V, and 48V designs, as well as isolated versions. Tachometer feedback for speed control is discussed.
Hi there,
have you forgotten the link to the app note?
http://www.maxim-ic.com/app-notes/index.mvp/id/3361
Thanks!