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MAX4051AEEE+T 其他数据使用手册 - Maxim Integrated（美信）
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MAX4051AEEE+T数据手册
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Reduced Audible Noise
One of the most immediately noticeable advantages of fan speed control comes in the form of relief for
your ears. Fans running at full speed can be a significant source of annoyance, especially for equipment
used in quiet office environments. Most offices are usually at a temperature significantly less than
electronic equipment is designed to operate up to, which means fan speed can be reduced without
adverse effects, much to the relief of everyone within hearing distance.
Reduced Power Consumption
Applications such as laptops will benefit from reduced power consumption. Figure 4 shows typical power
consumption versus fan speed for three different fans. Power consumption can be approximated as a
square of the fan's speed. In the case of the Nidec fan in Figure 4, reducing the fan speed to 69% of its
nominal at 12V cuts power consumption in half.
Figure 4. Power consumption versus fan speed.
Increased Lifetime
Reducing fan speed also decreases the wear on the fan. Fan wear is a rough function of the absolute
number of revolutions of the fan. Reduced wear translates into increased lifetimes and therefore greater
mean time between failures (MTBFs). Because fans are mechanical, they tend to be one of the more
common failures in a system. Anything that can be done to improve the MTBF for a fan will also cause a
significant increase of MTBF in the end equipment. This can be especially important in systems such as
servers and networking equipment.
Reduced Clogging
As anyone who has opened up old equipment knows, dust seems to be attracted to electronics,
especially in systems with fans. As dust collects at the inlet and the exhausts of systems with fans,
airflow can diminish or be stopped altogether. This, of course, can result in decreased cooling and higher
temperatures. Reduced fan speed can lessen the rate at which systems collect this dust, thus extending
the system's life.
Methods of Speed Control
Now that we better understand DC brushless fans, their available options, and the benefits of speed
control, we will look at three methods of controlling speed. Each method offers a trade-off when it comes
to cost versus performance.
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