![]() ![]() PWM can be used as a form of voltage control, and that’s exactly what it does for a PWM fan. In the next section, we’ll explore how this works. Most modern motherboards are likely to be equipped with such a header, which is connected to a PWM-supported BLDC fan. The reason is quite simple: The 4-pin PWM header is used to control the cooling fan that’s attached to the enclosure. So, why does a 4-pin PWM header exist on a motherboard? You’ll find PWM in controlling devices like servo motors, dimmers, buzzers, or as a telecommunication encoder. PWM is also seen in applications where information is encoded into a carrier pulse, by altering the interval of the active high state. PWM is commonly used to turn digital value into analog voltage by sending pulses with a duty cycle that results in the desired analog voltage. PWM stands for pulse width modulation, a technique that changes the duty cycle of a periodic digital pulse. To understand the reason for its existence, it’ll be best to revisit what PWM is all about. What Is a 4-Pin PWM Header?Ī 4-pin PWM header connects to a PC fan’s connector. In this article, we will uncover the benefits of the 4-pin PWM header and discuss what you need to design a fan controller. The 4-pin PWM header is unfamiliar to some, but its advantages make it worth knowing about. If you have ever wondered what a 4-pin PWM header is doing on a motherboard, you are not alone. Some cooling fans are driven by 4-pin PWMs. Learn the basics of what a 4-pin PWM header is.įind out what you need to design a 4-pin PWM fan controller. ![]()
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