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NCT7491
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Figure 14. Driving a 3Wire Fan Using an NChannel MOSFET
Figure 14 uses a 10 k pullup resistor for the TACH signal.
This assumes that the TACH signal is an opencollector
from the fan. In all cases, the TACH signal from the fan must
be kept below 3.6 V maximum to prevent damaging the
NCT7491.
Figure 15 shows a fan drive circuit using an NPN
transistor such as a general purpose MMBT2222. While
these devices are inexpensive, they tend to have much lower
current handling capabilities and higher on resistance than
MOSFETs. When choosing a transistor, care should be taken
to ensure that it meets the fans current requirements. Ensure
that the base resistor is chosen so that the transistor is
saturated when the fan is powered on.
Figure 15. Driving a 3Wire Fan Using an NPN Transistor
Because the fan drive circuitry in 4wire fans is not
switched on or off, as with previous PWM driven/powered
fans, the internal drive circuit is always on and uses the
PWM input as a signal instead of a power supply. This
enables the internal fan drive circuit to perform better than
3wire fans, especially for high frequency applications.
Figure 16 shows a typical drive circuit for 4wire fans.
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