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參數(shù)資料
| 型號(hào)： | TC648 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert |
| 中文描述： | 與自動(dòng)風(fēng)扇轉(zhuǎn)速控制關(guān)斷和過溫警報(bào) |
| 文件頁數(shù)： | 11/28頁 |
| 文件大小： | 602K |
| 代理商： | TC648 |
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2002 Microchip Technology Inc.
DS21448C-page 11
TC648
mistor resistance at T
MIN
. R
2
is then calculated to
deliver the desired speed at T
MIN
. The values for R
1
, R
2
and RT
1
are then checked at T
MAX
for 2.65V nominal.
It may be necessary to adjust the values of R
1
and R
2
after the initial calculation to obtain the desired results.
The design equations are:
EQUATION
EQUATION
EQUATION
Because the thermistor characteristics are fixed, it may
not be possible, in certain applications, to obtain the
desired values of V
MIN
and V
MAX
using the above
equations. In this case, the circuit in Figure 5-4 can be
used. Diode D
1
clamps V
IN
to the voltage required to
sustain minimum speed. The calculations of R
1
and
R
2
for the temperature sensor are identical to the
equation on the previous page.
FIGURE 5-4:
Minimum Fan Speed Circuit.
5.3
Auto-Shutdown Temperature
Design
A voltage divider on V
AS
sets the temperature at which
the part is automatically shut down if the sensed
temperature at V
IN
drops below the set temperature at
V
AS
(i.e. V
IN
< V
AS
).
As with the V
IN
input, 1.25V to 2.65V corresponds to
the temperature range of interest from T
1
to T
2
,
respectively. Assuming that the temperature sensor
network designed previously is linearly related to
temperature, the shutdown temperature T
AS
is related
to T
2
and T
1
by:
EQUATION
For example, if 1.25V and 2.65V at V
IN
corresponds to
a temperature range of T
1
= 0°C to T
2
= 125°C, and the
auto-shutdown temperature desired is 25°C, then the
V
AS
voltage is:
EQUATION
The V
AS
voltage may be set using a simple resistor
divider, as shown in Figure 5-5.
FIGURE 5-5:
V
AS
Circuit.
R
1
= (0.1)(RT
1MIN
)
Where: RT
1
= Thermistor resistance at T
MIN
R
2
=
(RT
1MIN
)(R
1
)(V
MIN
)
(RT
1MIN
+ R
1
)(V
DD
- V
MIN
)
Where V
MIN
= the value of V
IN
required for
minimum fan speed. V
DD
= Power Supply Voltage
V
MAX
=
(RT
1MIN
)(R
1
)(V
MIN
)
R
2
(R
1
+ RT
1MAX
)(V
DD
)
Where RT
1MAX
= thermistor resistance at T
MAX
,
V
MAX
= the value of V
IN
required for maximum
fan speed.
R
1
R
2
R
3
R
4
D
1
RT
1
V
DD
V
IN
2.65 - 1.25V
T
2
- T
1
= V
AS
- 1.25
T
AS
- T
1
V
AS
=
1.4V
T
2
- T
1
(T
AS
- T
1
) + 1.25
(
)
1.4V
(125 - 0)
V
AS
=
(25 - 0) + 1.25 = 1.53V
R
2
R
1
GND
V
DD
V
AS
I
DIV
I
IN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TC648E | Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert |
| TC648VPA | Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert |
| TC649EOA | PWM Fan Speed Controller with Auto-Shutdown and FanSense⑩ Technology |
| TC649VOA | CAPACITOR, CLASS Y2 15NFCAPACITOR, CLASS Y2 15NF; Capacitance:15nF; Voltage rating, AC:250V; Voltage rating, DC:2500V; Capacitor dielectric type:Polypropylene; Series:B81122; Tolerance, +:20%; Tolerance, -:20%; Temp, op. |
| TC649VPA | CAPACITOR, CLASS Y2 150NFCAPACITOR, CLASS Y2 150NF; Capacitance:150nF; Voltage rating, AC:250V; Voltage rating, DC:2500V; Capacitor dielectric type:Polypropylene; Series:B81122; Tolerance, +:20%; Tolerance, -:20%; Temp, op. |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| TC648BEOA | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Shtdn & Over-T Alert 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 |
| TC648BEOA713 | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Shtdn & Over-T Alert 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 |
| TC648BEOAG | 制造商:Microchip Technology 功能描述:PWM Fan Motor Speed Controller 8-Pin SOIC N Tube |
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