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I am wiring up a fan speed control circuit that creates a PWM frequency that is used by a PWM fan (the fan and its specs are pictured below). The fan claims that its PWM control is done through a 25kHz frequency. What will happen, in any situation in general, if I don't match 25kHz exactly?

San Ace 40 fan with a 25kHz PWM frequency

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  • \$\begingroup\$ Contact the manufacturer for certainty. \$\endgroup\$ – user2943160 Jun 20 '16 at 20:52
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If you will use 20kHz or 30kHz, odds are everything is fine. Other than that, you have to provide more details. I would bet you can go down to 10kHz with no problem.

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