![]() Many motherboards feature firmware and software that regulate these fans based on processor and computer case temperatures.ĭifferent fan controllers support different types of fan pins usually, it will be three or 4-pin. Exact speed behavior at low control levels is manufacturer dependent. Typically, a fan can be drive between about 30 % and 100 % of rat fan speed, using signal with up to 100 % duty cycle. Use of lower frequency could produce audible hum or whine. 25kHz is used to raise the sound of signal above the range of human listening. The control signal is square wave operating at 25 kHz, with duty cycle determining fan speed. Unlike linear voltage regulation, where fan voltage is proportional to speed, fan is driven with constant supply voltage speed control is performed by fan base on control signal. The Sense pin is used to relay rotation speed of the fan and the control pin is open-drain or open-collector output, which require pull-up to 5 V or 3. A PWM-capable fan is usually connected to a 4-pin connector. Pulse-width modulation is a common method of controlling computer fans. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |