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參數(shù)資料
| 型號： | TC649E |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | PWM Fan Speed Controller with Auto-Shutdown and FanSense⑩ Technology |
| 中文描述： | PWM風(fēng)扇帶自動調(diào)速器關(guān)斷和FanSense⑩技術(shù) |
| 文件頁數(shù)： | 14/28頁 |
| 文件大小： | 478K |
| 代理商： | TC649E |
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TC649
DS21449C-page 14
2002 Microchip Technology Inc.
A base-current limiting resistor is required with bipolar
transistors (Figure 5-7). The correct value for this
resistor can be determined as follows:
V
OH
V
R
SENSE
V
R
BASE
I
BASE
= V
R
SENSE
+ V
BE(
SAT
)
+ V
R
BASE
= I
FAN
x R
SENSE
= R
BASE
x I
BASE
= I
FAN
/ h
FE
V
OH
is specified as 80% of V
DD
in Section 1.0,
“Electrical Characteristics”; V
BE(
SAT
)
is given in the cho-
sen transistor data sheet. It is now possible to solve for
R
BASE
.
EQUATION
Some applications benefit from the fan being powered
from a negative supply to keep motor noise out of the
positive supply rails. This can be accomplished as
shown in Figure 5-8, with zener diode D
1
offsetting the
-12V power supply voltage, holding transistor Q
1
off
when V
OUT
is low. When V
OUT
is high, the voltage at
the anode of D
1
increases by V
OUT
, causing Q
1
to turn
on. Operation is otherwise the same as in the case of
fan operation from +12V.
FIGURE 5-7:
R
BASE
.
Circuit For Determining
FIGURE 5-8:
Powering the Fan from a -12V Supply.
R
BASE
=
V
OH
- V
BE(
SAT
)
- V
R
SENSE
I
BASE
Q1
GND
V
DD
R
SENSE
R
BASE
V
OH
= 80% V
DD
+ V
RBASE
–
V
BE(SAT)
–
+
V
RSENSE
–
Fan
+
GND
+5V
-12V
Q1*
V
DD
V
OUT
TC649
FAN
R2*
2.2 k
R3*
2.2
R4*
10 k
D1
12.0V
Zener
Note:
* Value depends on the specific application and is shown for example only.
See Section 5.0, "Typical Applications", for more details.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC649EOA | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 Shtdn & Fault Dtct 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 |
| TC649EOATR | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 Shtdn & Fault Dtct 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 |
| TC649EPA | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:PWM Fan Speed Controller with Auto-Shutdown and FanSense⑩ Technology |
| TC649EUA | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 Shtdn & Fault Dtct 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 |
| TC649EUATR | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 Shtdn & Fault Dtct 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 |
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