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參數(shù)資料
| 型號(hào)： | TC646VPA |
| 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(dòng)調(diào)速器關(guān)斷和FanSense⑩技術(shù) |
| 文件頁(yè)數(shù)： | 14/28頁(yè) |
| 文件大?。?/td> | 473K |
| 代理商： | TC646VPA |
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TC646
DS21446C-page 14
2002 Microchip Technology Inc.
A base-current limiting resistor is required with bipolar
transistors. This is shown in Figure 5-6.
FIGURE 5-6:
R
BASE
.
Circuit For Determining
The correct value for this resistor can be determined as
follows:
V
OH
V
RSENSE
V
RBASE
I
BASE
= V
RSENSE
+ V
BE(SAT)
+ V
RBASE
= 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
chosen 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. Zener diode D
1
offsets 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:
Output Drive Transistor Circuit Topologies.
Q
1
GND
V
DD
R
SENSE
R
BASE
V
OH
= 80% V
DD
+ V
RBASE
–
V
BE(SAT)
–
+
V
RSENSE
–
Fan
+
R
BASE
=
V
OH
- V
BE(SAT)
- V
RSENSE
I
BASE
Q
1
Q
1
Q
2
GND
V
DD
R
SENSE
R
BASE
V
OUT
V
OUT
Fan
a) Single Bipolar Transistor
Q
1
GND
V
DD
R
SENSE
V
OUT
c) N-Channel MOSFET
GND
V
DD
R
SENSE
R
BASE
Fan
b) Darlington Transistor Pair
Fan
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|---|---|
| TC646VUA | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Shtdn & Fault Dtct RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類(lèi)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 |
| TC646VUA713 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Shtdn & Fault Dtct RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類(lèi)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 |
| TC647 | 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:PWM Fan Speed Controller with FanSense Technology |
| TC647_13 | 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:PWM Fan Speed Controller with FanSensea?￠ Technology |
| TC647B | 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection |
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