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參數資料
| 型號： | FSCT |
| 英文描述： | FAN SPEED CONTROLER |
| 中文描述： | 風扇轉速智能控制器 |
| 文件頁數： | 1/11頁 |
| 文件大?。?/td> | 114K |
| 代理商： | FSCT |
1/11
FSCTxxA-UH5
September 2003 - Ed: 2A
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Built in thermal sensor
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Brushless DC fan speed control
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Linear control and regulation of the fan speed
according to the temperature
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Green OFF mode operation with automatic
turn- ON in case of overtemperature
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Voltage limitation above fan stall voltage
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No external NTC required
FEATURES
FAN SPEED CONTROLER
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COMPUTER AND SERVER POWER SUPPLY
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TELECOM
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LOW COST VENTILATION (consumer)
APPLICATIONS
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Low cost integrated fan speed control
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High integration: only one or two external com-
ponents
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Reduced acoustic noise because of the linear
control of the external transistor
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Power supply noise rejection
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Good thermal coupling with heater
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Reduced ON/OFF oscillation because of large
hysteresis
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High current capability (base current higher
than 10 mA)
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Higher accuracy than discrete circuit with NTC
GENERAL DESCRIPTION
BENEFITS
IPPAK
1
5
GND
OUT
BIAS
F
ON/OFF
ON/OFF
C
100nF
=
OUT
V
CC
V
T
HYST.-EN
HYSTERESIS
COMPARATOR
DRIVER
ON
REGULATION
VOLTAGE
REF.
TEMP.
SENSOR
ON
FSCTxxA-UH5
Fig. 1:
Block Diagram
.
A.S.D.
TM
Application Specific Discretes
The FSCTxxA-UH5 is a high-integrated low cost fan speed controller suitable for PC desktops, notebooks
and server power supplies and also all kind of equipments where low cost ventilation system is needed. An
internalthermalsensorconnectedtothetabisusedtoregulatethefanspeed.Acontinuousanalogvoltage
proportional to the tab temperature is produced at the OUT terminal and can control linearly an external
PNP transistor (Fan Transistor) connected in series with a Brushless DC Fan, in order to vary its speed.
The ON control terminal can be used to select two operation modes. If not connected (high impedance
state) ON mode is selected by default.
In Mode ON, the fan speed is regulated according to the tab temperature of the FSCT by adjusting the Vbe
voltage of the PNP fan Transistor. In low temperature conditions, the fan transistor voltage is limited to
about 5.5V (for a 12V fan) in order to guarantee a minimum voltage across the fan above its stalling voltage
and to keep it running (see figure 3).
This regulation is implemented with a high Fan supply voltage rejection.
The mode OFF allows to operate in green Mode. The fan is stopped as long as the temperature remains
below the TON threshold. When the temperature rises above TON the fan is forced to ON and the speed is
regulated according to the temperature as in the same way as mode ON. When temperature falls below
TOFF, the fan is automatically turned OFF. The hysteresis has been dimensioned large enough to reduce
ON/OFF oscillations during the green mode operation.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| FSCT07A-UH5 | 功能描述:馬達/運動/點火控制器和驅動器 Fan Speed Controller RoHS:否 制造商:STMicroelectronics 產品: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 |
| FSCT11A-UH5 | 功能描述:馬達/運動/點火控制器和驅動器 Fan Speed Controller RoHS:否 制造商:STMicroelectronics 產品: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 |
| FSCT17A-UH5 | 功能描述:馬達/運動/點火控制器和驅動器 Fan Speed Controller RoHS:否 制造商:STMicroelectronics 產品: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 |
| FSCTEST | 制造商:Fairchild Semiconductor Corporation 功能描述:. |
| FSCTXXA-UH5 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:FAN SPEED CONTROLER |
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