參數(shù)資料
型號(hào)： TC665EUN
廠(chǎng)商： Microchip Technology Inc.
英文描述： SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection
中文描述： ⑩的SMBus PWM風(fēng)扇與風(fēng)扇轉(zhuǎn)速控制器故障檢測(cè)
文件頁(yè)數(shù)： 24/36頁(yè)
文件大?。?/td> 695K
代理商： TC665EUN
TC664/TC665
DS21737A-page 24
2002 Microchip Technology Inc.
7.4
FanSense Network (R
SENSE
&
C
SENSE
)
The network comprised of R
SENSE
and C
SENSE
allows
the TC664/TC665 devices to detect commutation of the
fan motor. R
SENSE
converts the fan current into a volt-
age. C
SENSE
AC couples this voltage signal to the
SENSE pin. The goal of the SENSE network is to pro-
vide a voltage pulse to the SENSE pin that has a mini-
mum amplitude of 120 mV. This will ensure that the
current pulse caused by the fan commutation is recog-
nized by the TC664/TC665 device.
A 0.1 μF ceramic capacitor is recommended for
C
SENSE
. Smaller values will require larger sense resis-
tors be used. Using a 0.1 μF capacitor results in rea-
sonable values for R
SENSE
. Figure 7-5 illustrates a
typical SENSE network.
FIGURE 7-5:
Typical Sense Network.
The value of R
SENSE
will change with the current rating
of the fan. A key point is that the current rating of the
fan specified by the manufacturer may be a worst case
rating. The actual current drawn by the fan may be
lower than this rating. For the purpose of setting the
value for R
SENSE
, the operating fan current should be
measured.
Table 7-1 shows values of R
SENSE
according to the
nominal operating current of the fan. The fan currents
are average values. If the fan current falls between two
of the values listed, use the higher resistor value.
TABLE 7-1:
R
SENSE
VS. FAN CURRENT
Nominal Fan Current
(mA)
Figure 7-6 shows some typical waveforms for the fan
current and the voltage at the Sense pins.
FIGURE 7-6:
Sense Pin Waveforms.
Typical Fan Current and
7.5
Output Drive Device Selection
The TC664/TC665 devices are designed to drive two
external NPN transistors or two external N-channel
MOSFETs as the fan speed modulating elements.
These two arrangements are shown in Figure 7-7. For
lower current fans, NPN transistors are a very econom-
ical choice for the fan drive device. It is recommended
that, for higher current fans (500 mA and above), MOS-
FETs be used as the fan drive device. Table 7-2 pro-
vides some possible part numbers for use as the fan
drive element.
When using an NPN transistor as the fan drive ele-
ment, a base current limiting resistor must be used.
This is shown in Figure 7-7.
When using MOSFETs as the fan drive element, it is
very easy to turn the MOSFETs on and off at very high
rates. Because the gate capacitances of these small
FAN
R
ISO
R
SENSE
C
SENSE
SENSE
V
OUT
(0.1 μF typical)
715
Note:
See Table 7-1 for R
SENSE
value.
R
SENSE
(ohm)
50
100
150
200
250
300
350
400
450
500
9.1
4.7
3.0
2.4
2.0
1.8
1.5
1.3
1.2
1.0
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