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參數(shù)資料
| 型號： | TC646 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | PWM Fan Speed Controller with Auto-Shutdown and FanSense⑩ Technology |
| 中文描述： | PWM風扇帶自動調速器關斷和FanSense⑩技術 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 473K |
| 代理商： | TC646 |
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TC646
DS21446C-page 16
2002 Microchip Technology Inc.
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 auto-shutdown level V
AS
= 1.8V.
Limit the divider current to 100 μA from which
R
5
= 33 k
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.
5.8
TC646 as a Microcontroller
Peripheral
In a system containing a microcontroller or other host
intelligence, the TC646 can be effectively managed as
a CPU peripheral. Routine fan control functions can be
performed by the TC646 without controller intervention.
The microcontroller receives temperature data from
one or more points throughout the system. It calculates
a fan operating speed based on an algorithm specifi-
cally designed for the application at hand. The proces-
sor controls fan speed using complementary port bits
I/O1 through I/O3. Resistors R
1
through R
6
(5% toler-
ance) form a crude 3-bit DAC that translates the 3-bit
code from the processor's outputs into a 1.6V DC con-
trol signal. A monolithic DAC or digital pot may be used
instead of the circuit shown in Figure 5-10.
With V
AS
set at 1.8V, the TC646 enters auto-shutdown
when the controller's output code is 000[B]. Output
codes 001[B] to 111[B] operate the fan from roughly
40% to 100% of full speed. An open-drain output from
the processor (I/O0) can be used to reset the TC646
following detection of a fault condition. The FAULT out-
put can be connected to the controller's interrupt input,
or to another I/O pin, for polled operation.
FAULT
SENSE
NTC
10 k
@ 25C
R
1
20.5 k
R
3.83 k
R
33 k
R
7
800
R
6
18 k
GND
Reset
Shutdown
(Optional)
Q
1
+12V
+5V
+5V
+5V
V
DD
V
IN
V
AS
V
OUT
R
SENSE
2.2
C
SENSE
0.1
μ
F
C
1
1
μ
F
C
F
TC646
Fan
Fan/Thermal
Fault
C
0.01
μ
F
C
B
0.01
μ
F
C
B
1
μ
F
1
8
4
6
7
5
2
3
Open-Drain
Device
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TC646B | 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 |
| TC646B_13 | 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 FanSensea?￠ Technology for Fault Detection |
| TC646BEOA | 功能描述:馬達/運動/點火控制器和驅動器 w/Rstrt Shtdn & Flt 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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC646BEOA713 | 功能描述:馬達/運動/點火控制器和驅動器 w/Rstrt Shtdn & Flt 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 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC646BEOATR | 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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