參數資料
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： 15/28頁
文件大?。?/td> 473K
代理商： TC646
2002 Microchip Technology Inc.
DS21446C-page 15
TC646
FIGURE 5-8:
Power the Fan from a -12V Supply.
TABLE 5-2:
TRANSISTORS AND MOSFETS FOR Q
1
(V
DD
= 5V)
Max. V
BE(sat)
/V
GS
(V)
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) is
powered by a supply different from that of the TC646.
Care should be taken to ensure that the TC646’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 driven
from a high impedance source (such as a thermistor).
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 TC646 ground pin,
individual ground returns for the TC646 and the low
side of the fan current sense resistor should be used.
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
GND
+5V
-12V
Q
1
*
V
DD
V
OUT
TC646
Fan
R
2
*
2.2 k
R
3
*
2.2
R
4
*
10 k
D
1
12.0V
Zener
NOTE:
*Value depends on the specific application and is shown for example only.
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相關代理商/技術參數
參數描述
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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