參數(shù)資料
型號： TC647VUA
廠商： Microchip Technology Inc.
英文描述： PWM Fan Speed Controller with FanSense Technology
中文描述： 與FanSense PWM風(fēng)扇速度控制器技術(shù)
文件頁數(shù)： 14/28頁
文件大?。?/td> 478K
代理商： TC647VUA
TC647
DS21447C-page 14
2002 Microchip Technology Inc.
FIGURE 5-7:
Output Drive Transistor Circuit Topologies.
FIGURE 5-8:
-12V Supply.
Powering the Fan from a
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
MIN
divider or shutdown circuit) is
powered by a supply different from that of the TC647.
Care should be taken to ensure that the TC647’s V
DD
supply powers up first. If possible, the networks
attached to V
IN
and V
MIN
should connect to the V
DD
supply 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 connect-
ing 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
MIN
inputs may cause
erroneous operation of the FAULT output. As a result,
these inputs should be bypassed with a 0.01 μF capac-
itor mounted as close to the package as possible. This
is particularly true of V
IN
, which is usually driven from a
high impedance source (such as a thermistor). In addi-
tion, the V
DD
input should be bypassed with a 1 μF
capacitor. Ground should be kept as short as possible.
To keep fan noise off the TC647 ground pin, individual
ground returns for the TC647 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
.
Q1
Q1
Q2
GND
V
DD
R
SENSE
R
BASE
V
OUT
V
OUT
Fan
a) Single Bipolar Transistor
Q1
GND
V
DD
R
SENSE
V
OUT
C) N-Channel MOSFET
GND
V
DD
R
SENSE
R
BASE
Fan
b) Darlington Transistor Pair
Fan
GND
+5V
Q1 *
V
DD
V
OUT
TC647
Fan
R2 *
2.2 k
R3 *
*Note: Value depends on the specific application and is shown for example only.
1D1
Zener
-12V
R4 *
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TC647 PWM Fan Speed Controller with FanSense Technology
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC647VUATR 功能描述:馬達/運動/點火控制器和驅(qū)動器 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
TC648 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
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/運動/點火控制器和驅(qū)動器 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
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