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參數(shù)資料
| 型號： | TC647VPA |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | PWM Fan Speed Controller with FanSense Technology |
| 中文描述： | 與FanSense PWM風(fēng)扇速度控制器技術(shù) |
| 文件頁數(shù)： | 13/28頁 |
| 文件大小： | 478K |
| 代理商： | TC647VPA |
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2002 Microchip Technology Inc.
DS21447C-page 13
TC647
FIGURE 5-6:
R
BASE
.
Circuit For Determining
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 require the fan to be powered from the
negative 12V supply to keep motor noise out of the
positive voltage power supplies. 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
the case of fan operation from +12V.
TABLE 5-2:
TRANSISTORS AND MOSFETS FOR Q
1
(V
DD
= 5V)
Max. V
BE(sat)
/V
GS
(V)
Q1
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
R
SENSE
I
BASE
Device
Package
Min. H
FE
V
CEO
/V
DS
(V)
Fan Current
(mA)
Suggested
R
BASE
(
)
800
800
301
Note 1
Note 1
Note 1
Note 1
MMBT2222A
MPS2222A
MPS6602
SI2302
MGSF1N02E
SI4410
SI2308
Note 1:
A series gate resistor may be used in order to control the MOSFET turn-on and turn-off times.
SOT-23
TO-92
TO-92
SOT-23
SOT-23
SO-8
SOT-23
1.2
1.2
1.2
2.5
2.5
4.5
4.5
50
50
50
NA
NA
NA
NA
40
40
40
20
20
30
60
150
150
500
500
500
1000
500
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TC647VUA | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 w/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 |
| TC647VUATR | 功能描述:馬達(dá)/運動/點火控制器和驅(qū)動器 w/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 |
| TC648 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert |
| TC648_13 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert |
| TC648B | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense⑩ Technology for Fault Detection |
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