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參數(shù)資料
| 型號： | TC649 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | PWM Fan Speed Controller with Auto-Shutdown and FanSense Technology(風(fēng)扇監(jiān)控器帶自動關(guān)斷功能) |
| 中文描述： | PWM風(fēng)扇帶自動調(diào)速器關(guān)斷和FanSense科技（風(fēng)扇監(jiān)控器帶自動關(guān)斷功能） |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 478K |
| 代理商： | TC649 |
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2002 Microchip Technology Inc.
DS21449C-page 15
TC649
5.6
Latch-up Considerations
As with any CMOS IC, the potential exists for latch-up
if signals are applied to the device which are outside
the power supply range. This is of particular concern
during power-up if the external circuitry (such as the
sensor network, V
AS
divider or shutdown circuit) are
powered by a supply different from that of the TC649.
Care should be taken to ensure that the TC649’s V
DD
supply powers up first. If possible, the networks
attached to V
IN
and V
AS
should connect to the V
DD
sup-
ply at the same physical location as the IC itself. Even
if the IC and any external networks are powered by the
same supply, physical separation of the connecting
points can result in enough parasitic capacitance and/
or inductance in the power supply connections to delay
one power supply “routing” versus another.
5.7
Power Supply Routing and
Bypassing
Noise present on the V
IN
and V
AS
inputs may cause
erroneous operation of the FAULT output. As a result,
these inputs should be bypassed with a 0.01 μF
capacitor mounted as close to the package as possible.
This is especially true of V
IN
, which is usually drive from
a high impedance source (such as a thermistor). Addi-
tionally, the V
DD
input should be bypassed with a 1 μF
capacitor with grounds being kept as short as possible.
To keep fan noise off the TC649 ground pin, individual
ground returns for the TC649 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 auto-shutdown Level.
V
AS
= 1.8V.
Limit the divider current to 100 μA
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.
FAULT
SENSE
NTC
10 k
@ 25C
R1
20.5 k
R2
3.83 k
R5
33 k
R7
800
GND
RESET
Shutdown
(Optional)
Q1
+12V
+5V
+5V
+5V
V
DD
V
IN
V
AS
V
OUT
R
SENSE
2.2
C
SENSE
0.1 μF
C1
1 μF
C
F
TC649
Fan
Fan Fault
C
B
0.01 μF
C
B
0.01 μF
C
B
1 μF
1
8
4
6
7
5
2
3
R6
18 k
Open-
Drain
Device
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC649_13 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:PWM Fan Speed Controller with Auto-Shutdown and FanSensea?￠ Technology |
| TC649B | 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 |
| TC649BEOA | 功能描述:馬達/運動/點火控制器和驅(qū)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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| TC649BEOA713 | 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 |
| TC649BEOATR | 功能描述:馬達/運動/點火控制器和驅(qū)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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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