PWM fan controller

Posted on Oct 5, 2012

Microchip Technology ( offers a family of cooling-fan speed controllers that operate in PWM mode for use with brushless dc fans (Reference 1). To control fan speed using the PWM waveform`s duty cycle, you can use either an external NTC (negative-temperature-coefficient) thermistor or one of Microchip`s PIC microcontrollers and its SMBus serial-data bus. Figure 1 illustrates a typical application that the data sheet describes for the TC664 and TC665 controllers (Reference 2).

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