- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384955 > TC654EUN (Microchip Technology Inc.) Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection PDF資料下載
參數(shù)資料
| 型號(hào)： | TC654EUN |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| 中文描述： | 雙PWM風(fēng)扇的SMBus⑩故障檢測(cè)與風(fēng)扇轉(zhuǎn)速控制器 |
| 文件頁(yè)數(shù)： | 24/36頁(yè) |
| 文件大?。?/td> | 706K |
| 代理商： | TC654EUN |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)當(dāng)前第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)
TC654/TC655
DS21734A-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 TC654/TC655 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 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 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 purposes 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 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
F1
F2
R
ISO1
R
ISO2
R
SENSE2
R
SENSE1
C
SENSE2
(0.1 μF typical)
C
SENSE1
(0.1 μF typical)
SENSE2
SENSE1
V
OUT
715
715
Note:
See Table 7-1 for R
SENSE1
and R
SENSE2
values.
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC655EUN | Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| TC654 | Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| TC655 | Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| TC665EUN | SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| TC664EUN | SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC654EUNTR | 功能描述:軟開(kāi)關(guān) PWM 控制器 Dual RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| TC655 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| TC655EUN | 功能描述:軟開(kāi)關(guān) PWM 控制器 Dual RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| TC655EUNTR | 功能描述:軟開(kāi)關(guān) PWM 控制器 Dual RoHS:否 制造商:Fairchild Semiconductor 輸出端數(shù)量: 輸出電流: 開(kāi)關(guān)頻率: 工作電源電壓:30 V 電源電流: 最大工作溫度:+ 105 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| TC65A | 制造商:CDE 制造商全稱:Cornell Dubilier Electronics 功能描述:Axial Leaded Aluminum Electrolytic Capacitors |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。