AN-1117 Speed Regulating PWM Fan Motor Controller

The GreenPAK device can be used in high power applications by controlling a FET to drive a motor i.e. a PWM DC-DC buck converter. In this app note, we will show how to design a programmable closed-loop speed-regulating PWM fan controller using RPM feedback and I2C. The average percent error is less than 2.5%, and the min and max were less than 15%. These can be improved by increasing resolution at the cost of increased settling time.

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