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| 型号： | TC665EUN |
| 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： | 695K |
| 代理商： | TC665EUN |
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TC664/TC665
DS21737A-page 24
2002 Microchip Technology Inc.
7.4
FanSense Network (RSENSE &
CSENSE)
The network comprised of RSENSE and CSENSE allows
the TC664/TC665 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 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 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 purpose of setting the
value for RSENSE, the operating fan current should be
measured.
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 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
RISO
RSENSE
CSENSE
SENSE
VOUT
(0.1 F typical)
715
Note:
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC665EUNTR | 功能描述:马达/运动/点火控制器和驱动器 Single RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC67 | 功能描述:铝质电解电容器 - 带引线 40uF 350V RoHS:否 制造商:Kemet 引线类型: 电容:220 uF 容差:20 % 电压额定值:25 V 工作温度范围: 端接类型:Radial 外壳直径:8 mm 外壳长度:11 mm 引线间隔:5 mm 产品:General Purpose Electrolytic Capacitors 封装:Bulk |
| TC670 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Tiny Predictive Fan Failure Detector |
| TC670_03 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Tiny Predictive Fan Failure Detector |
| TC670_13 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Tiny Predictive Fan Failure Detector |
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