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參數(shù)資料
| 型號： | TC664EUN |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| 中文描述： | ⑩的SMBus PWM風扇與風扇轉(zhuǎn)速控制器故障檢測 |
| 文件頁數(shù)： | 27/36頁 |
| 文件大?。?/td> | 695K |
| 代理商： | TC664EUN |
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2002 Microchip Technology Inc.
DS21737A-page 27
TC664/TC665
Figure 7-10 shows the voltage pulse at the Sense pin,
which is caused by the fan's "extra" current pulse
during PWM output turn-on.
FIGURE 7-10:
Extra Pulse at Sense Pin.
This problem occurs mainly with fans that have a cur-
rent waveshape like the one shown in Figure 7-9. For
configurations where an NPN transistor is being used
as the external drive device, the typical Rsense and
C
SENSE
scheme can continue to be used to sense the
fan current pulses. In order to eliminate the extra cur-
rent pulse, a slow down capacitor can be placed from
the base of the transistor to ground. A 0.1 μF capacitor
is appropriate in most cases. This arrangement is
shown in Figure 7-11. This capacitor will help to slow
down the turn-on edge of the transistor and reduce the
amplitude of the extra current pulse.
For configurations using an N-channel MOSFET as the
drive device, the slow down capacitor does not fix all
conditions and the current sensing scheme must be
changed. Since the current for this type of fan always
returns to zero, the coupling capacitor, C
SENSE
, is not
needed. Instead, it will be replaced by an R-C configu-
ration to eliminate the voltage pulse generated by the
extra current pulse. This new sensing configuration is
shown in Figure 7-12. The values of the resistor/capac-
itor combination should be adjusted so that the voltage
pulse generated by the extra current pulse is smoothed
and is not registered by the TC664/TC665 as a true fan
current pulse. Typical values for R
SLOW
and C
SLOW
are 1 k
and 1000 pF, respectively.
FIGURE 7-11:
Capacitor.
Transistor Drive with C
SLOW
FIGURE 7-12:
C
SLOW
Sense Scheme.
FET Drive with R
SLOW
/
Sense Pin Voltage
"Extra Pulse"
VOUT PWM
C
SLOW
(0.1 μF
typical)
SENSE
V
OUT
FAN
R
ISO
R
SENSE
C
SENSE
(0.1 μF typical)
TC664
TC665
GND
C
SLOW
(1000 pF
typical)
SENSE
V
OUT
FAN
R
SLOW
(1 k
typical)
R
SENSE
TC664
TC665
GND
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC664 | SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| TC665 | SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| TC670ECH | Tiny Predictive Fan Failure Detector |
| TC7400BP | TC7400BP |
| TC74AC00F | Quad 2-Input NAND Gate(四2輸入與非門) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC664EUNTR | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Single RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC665 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| TC665EUN | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Single RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC665EUNTR | 功能描述:馬達/運動/點火控制器和驅(qū)動器 Single RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC67 | 功能描述:鋁質(zhì)電解電容器 - 帶引線 40uF 350V RoHS:否 制造商:Kemet 引線類型: 電容:220 uF 容差:20 % 電壓額定值:25 V 工作溫度范圍: 端接類型:Radial 外殼直徑:8 mm 外殼長度:11 mm 引線間隔:5 mm 產(chǎn)品:General Purpose Electrolytic Capacitors 封裝:Bulk |
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