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參數(shù)資料
| 型號(hào)： | TC642DEMO |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | PWM Fan Speed Controller with FanSense⑩ Technology |
| 中文描述： | 與FanSense PWM風(fēng)扇速度控制器⑩技術(shù) |
| 文件頁數(shù)： | 15/28頁 |
| 文件大小： | 485K |
| 代理商： | TC642DEMO |
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2002 Microchip Technology Inc.
DS21444C-page 15
TC642
5.7
Power Supply Routing and
Bypassing
Noise present on the V
IN
and V
MIN
inputs may cause
erroneous operation of the FAULT output. As a result,
these inputs should be bypassed with a 0.01
μ
F
capacitor mounted as close to the package as is possi-
ble. This is particularly true of V
IN
, which is usually
driven from a high impedance source (such as a ther-
mistor). In addition, the V
DD
input should be bypassed
with a 1 μF capacitor. Grounds should be kept as short
as possible. To keep fan noise off the TC642 ground
pin, individual ground returns for the TC642 and the low
side of the fan current sense resistor should be used.
Design Example
Step 1.
Calculate R
1
and R
2
based on using an NTC
having a resistance of 10 k
at T
MIN
(25°C)
and 4.65 k
at T
MAX
(45°C) (see Figure 5-9).
R
1
= 20.5 k
R
2
= 3.83 k
Step 2.
Set minimum fan speed V
MIN
= 1.8V.
Limit the divider current to 100 μA from which
R
5
= 33 k
and R
6
= 18 k
.
Step 3.
Design the output circuit.
Maximum fan motor current = 250 mA.
Q
1
beta is chosen at 50 from which
R
7
= 800
.
FIGURE 5-9:
Design Example.
FAULT
SENSE
NTC
10 k
@ 25C
R
1
20.5 k
R
2
3.83 k
R5
33 k
R
7
800
R
6
18 k
R
8
10 k
GND
Fan
Shutdown
(Optional)
Q
1
Q
2
+12V
+5V
+5V
+5V
V
DD
V
IN
V
MIN
V
OUT
R
SENSE
2.2
C
0.1
μ
F
C
1
1
μ
F
C
F
TC642
Fan
C
B
0.01 μF
C
B
0.01
μ
F
+
C
B
1
μ
F
8
4
6
7
5
2
3
1
Fan/
Thermal Fault
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC642DEMO | 制造商:Microchip Technology Inc 功能描述:Tools Development kit For Use |
| TC642EOA | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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 |
| TC642EOA713 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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 |
| TC642EPA | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:PWM Fan Speed Controller with FanSense⑩ Technology |
| TC642EUA | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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 |
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