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参数资料
| 型号： | TC655EUNTR |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 17/36页 |
| 文件大小： | 706K |
| 代理商： | TC655EUNTR |
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TC654/TC655
DS21734A-page 24
2002 Microchip Technology Inc.
7.4
FanSense Network (RSENSE &
CSENSE)
The network comprised of RSENSE and CSENSE allows
the TC654/TC655 devices to detect commutation of the
fan motor. RSENSE converts the fan current into a volt-
age. CSENSE AC couples this voltage signal to the
SENSE pins (SENSE1 & SENSE2). The goal of the
SENSE network is to provide a voltage pulse to the
SENSE pin that has a minimum amplitude of 120 mV.
This will ensure that the current pulse caused by the
fan commutation is recognized by the TC654/TC655
device.
A 0.1 F ceramic capacitor is recommended for
CSENSE. Smaller values will require larger sense resis-
tors be used. Using a 0.1 F capacitor results in rea-
typical SENSE network.
FIGURE 7-5:
Typical Sense Network.
The value of RSENSE 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 purposes of setting the
measured.
Table 7-1 shows values of RSENSE 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:
RSENSE VS. FAN CURRENT
Figure 7-6 shows some typical waveforms for the fan
current and the voltage at the Sense pins.
FIGURE 7-6:
Typical Fan Current and
Sense Pin Waveforms.
7.5
Output Drive Device Selection
The TC654/TC655 is 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 cur-
rent fans, NPN transistors are a very economical
choice for the fan drive device. It is recommended that,
for higher current fans (500 mA and above), MOSFETs
be used as the fan drive device. Table 7-2 provides
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
RISO1
RISO2
RSENSE2
RSENSE1
CSENSE2
CSENSE1
12
SENSE2
SENSE1
VOUT
(0.1 F typical)
715
715
Note:
See Table 7-1 for RSENSE1 and RSENSE2 values.
RISO2
Nominal Fan Current
(mA)
RSENSE (ohm)
50
9.1
100
4.7
150
3.0
200
2.4
250
2.0
300
1.8
350
1.5
400
1.3
450
1.2
500
1.0
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