Pulse-width modulation
Pulse-width modulation (PWM) is a common method of controlling computer fans. A PWM-capable fan is usually connected to a 4-pin connector (pinout: Ground, +12 V, sense, control). The sense pin is used to relay the rotation speed of the fan and the control pin is an open-drain or open-collector output, which requires a pull-up to 5 V or 3.3 V in the fan. Unlike linear voltage regulation, where the fan voltage is proportional to the speed, the fan is driven with a constant supply voltage; the speed control is performed by the fan based on the control signal.
The control signal is a square wave operating at 25 kHz, with the duty cycle determining the fan speed. 25kHz is used to raise the sound of the signal above the range of human hearing; use of a lower frequency could produce an audible hum or whine. Typically a fan can be driven between about 30% and 100% of the rated fan speed, using a signal with up to 100% duty cycle. The exact speed behavior (linear, off until a threshold value, or a minimum speed until a threshold) at low control levels is manufacturer dependent.
Many motherboards feature firmware and software that regulates these fans based on processor and computer case temperatures.
C80XX-XX
80x80x38 mm
1.283 〜2.71 m3/min
7.23〜29.38 mm-H2O
Material
Frame: Thermoplastic PBT of UL 94V-O
Impellen Thermoplastic PBT of UL 94V-O
Bobbin: Thermoplastic PBT of UL 94V-O
Lead Wire: AWG26, Red Wire Positive(+) Black wire Negative(-)
About us:
Everrich Electronic(Dong Guan)Co.,Ltd, a subsidiary of Cheng Home Electronics Co.,Ltd, is the Taiwan based enterprise which is specialized in designing and manufacturing of DC brushless fans and motors. The company was established in Oct.1985. It has been 30 years experience of professional design and manufacture of DC fans, motors. We use advanced auto production equipment and testing machines,and we have senior professional & manager and technique power is strong.
We have continuously made all series of DC brushless fans from size 25mm to 172mm,and thickness from 6mm to 50mm. We would like to establish a partnership with each customer by developing any kind of fan and motor for customers special needs in PCs,desktop computers,telecom,car,projector,copy machine,fragrance lamp and industrial,medical,home application and other equipments.
We produce high efficiency,quality and stability. Our fans low noise,high airflow,long life.We have passed many domestic / international professional certificate such as CCC,UL,TUV. The product are sold to USA, Japan, Korea, South-east Asia and Hong Kong etc. around the world. Besides, we have a cooperation with world famous companies. In order to always keep in the leading position in the world, we continually import equipment,develop new product and create new market.
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