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| 型號(hào)： | FSCT |
| 英文描述： | FAN SPEED CONTROLER |
| 中文描述： | 風(fēng)扇轉(zhuǎn)速智能控制器 |
| 文件頁(yè)數(shù)： | 7/11頁(yè) |
| 文件大小： | 114K |
| 代理商： | FSCT |
FSCTxxA-UH5
7/6
Time
2
3
T
OFF
T
ON
T
j
T
P
1
Fig. 8:
Temperature evolution cases in mode OFF.
3. Internal temperature sensor
3.1 Temperature sensor linear response
FSCT devices feature an internal temperature sensor. This sensor results directly from silicon properties. It
isactuallyavoltagereferencewhichisproportionaltotheabsolutetemperature,asitisanimageoftheSili-
con thermal voltage "Vt" (refer to the following equation).
k Boltzmann cons
T absolute temperature K
q
.
=
16 10
This sensing method, which presents a positive temperature coefficient of +2mV/°C is preferred to a V
BE
sensing method (-2mV/°C, sometimes used in thermal protections) because of its better accuracy (low im-
pact of process dispersions).
This signal is then processed to provide the desired OUT voltage range.
Vt
k T
q
=
with:
t
:
:
tan
(
)
19
C
This internal sensor allows users not to use a Negative Temperature Coefficient thermistor (NTC).
Hence, users get rid of Joule effect, due to NTC bias current, that disturbs the temperature measurement.
Furthermore, the FSCT response is linear with the temperature. This simplifies the thermal study and the
heat sink rating for the power supply components or for the microprocessor.
NTC thermistors users need also to add a fixed resistor in order to get a linear thermal response from such
kind of sensor. The linear behavior is also only ensured for a restricted temperature range.
3.2 IPPAK mounting considerations
First, it should be noted that the tab is directly connected to the GND pin; then care must be taken when the
FSCT is glued to a heatsink. If this heatsink is at a differential voltage that the Ground, an electrical insula-
tor has to be added between the tab and the heat-sink.
Using non-isolated Through-Hole package like the IPPAK offers also a lot of benefits, compared to NTC
bulbs. Indeed, NTC do not offer a flat area like IPPAK package. Users need to add some glue to ensure
contact of the NTC bulb and the heat sink, at the cost of an increase in the thermal impedance and
response.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FSCT07A-UH5 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Fan Speed Controller 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| FSCT11A-UH5 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Fan Speed Controller 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| FSCT17A-UH5 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Fan Speed Controller 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(fēng)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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