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Efficient Design of a Brushless DC Fan with a Programmable System-on-a-Chip | Cypress Semiconductor

Efficient Design of a Brushless DC Fan with a Programmable System-on-a-Chip

Last Updated: 
Aug 13, 2009

As more industrial and consumer products get smaller, the need to remove the heat in an efficient, quiet way becomes increasingly important.  A programmable system on a chip produces an efficient, cost-effective means for accomplishing this.  This article looks at how to efficiently design a brushless DC fan using a PSoC.

A typical intelligent DC fan has four wires; power (red), ground (black), a PWM input to set fan speed (blue), and a tachometer output (green).  The host system requests a specific speed by setting the duty cycle of the PWM and verifies the correct operation with the tachometer feedback.  Measuring the ambient temperature allows the fan to run as slow and as seldom as possible.  It comes at the cost of a thermistor.  To read more, click the download link below or visit Industrial Embedded Systems.

Translated documents are for reference only. We recommend that you refer to the English-language version of a document if you are engaged in development of a design.