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参数资料
| 型号： | TC648BEPA |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDIP8 |
| 封装： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件页数： | 11/36页 |
| 文件大小： | 704K |
| 代理商： | TC648BEPA |
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2003 Microchip Technology Inc.
DS21755B-page 19
TC646B/TC648B/TC649B
data sheet. With the values for the thermistor and the
values for VIN, you now have two equations from which
the values for R1 and R2 can be found.
Example: The following design goals are desired:
Duty Cycle = 50% (VIN = 1.90V) with Temperature
(T1) = 30°C
Duty Cycle = 100% (VIN = 2.60V) with
Temperature (T2) = 60°C
Using a 100 k
thermistor (25°C value), we look up the
thermistor values at the desired temperatures:
RT (T1) = 79428 @ 30°C
RT (T2) = 22593 @ 60°C
Substituting these numbers into the given equations
produces the following numbers for R1 and R2.
R1 = 34.8 k
R2 = 14.7 k
FIGURE 5-2:
How Thermistor Resistance,
VIN, and RTEMP Vary With Temperature.
and VIN, versus temperature for the example shown
above.
5.3
Thermistor Selection
As with any component, there are a number of sources
for thermistors. A listing of companies that manufacture
thermistors can be found at www.temperatures.com/
thermivendors.html. This website lists over forty
suppliers of thermistor products. A brief list is shown
here:
5.4
FanSense Network
(RSENSE and CSENSE)
The SENSE network (comprised of RSENSE and
CSENSE) allows the TC646B and TC649B devices to
detect commutation of the fan motor. RSENSE converts
the fan current into a voltage. CSENSE AC couples this
voltage signal to the SENSE pin. The goal of the
SENSE network is to provide a voltage pulse to the
SENSE pin that has a minimum amplitude of 90 mV.
This will ensure that the current pulse caused by the
fan commutation is recognized by the TC646B/
TC649B device.
A 0.1 F ceramic capacitor is recommended for
CSENSE. Smaller values will require that larger sense
resistors be used. Using a 0.1 F capacitor results in
typical SENSE network.
FIGURE 5-3:
Typical Sense Network.
The required value of RSENSE will change with the cur-
rent rating of the fan and the fan current waveshape. A
key point is that the current rating of the fan specified
by the manufacturer may be a worst-case rating, with
the actual current drawn by the fan being lower than
this rating. For the purposes of setting the value for
RSENSE, the operating fan current should be measured
to get the nominal value. This can be done by using an
oscilloscope current probe or using a voltage probe
with a low-value resistor (0.5
). Another good tool for
this exercise is the TC642 Evaluation Board. This
board allows the RSENSE and CSENSE values to be eas-
ily changed while allowing the voltage waveforms to be
monitored to ensure the proper levels are being
reached.
nominal operating current of the fan. The fan currents
are average values. If the fan current falls between two
of the values listed, use the higher resistor value.
-
Thermometrics
-
Quality Thermistor
-
Ametherm
-
Sensor Scientific
-
U.S. Sensor
-
Vishay
-
Advanced Thermal
Products
-
muRata
0
20
40
60
80
100
120
140
20
30
40
50
60
70
80
90
100
Temperature (C)
Network
Resistance
(k
)
0.000
0.500
1.000
1.500
2.000
2.500
3.000
3.500
4.000
V
IN
(V)
NTC Thermistor
100 k @ 25C
VIN Voltage
RTEMP
FAN
RISO
RSENSE
CSENSE
SENSE
VOUT
(0.1 F typical)
715
Note:
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| TC648BEUA713 | 功能描述:马达/运动/点火控制器和驱动器 Shtdn & Over-T Alert RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC648BEUATR | 制造商:MICROCHIP 制造商全称: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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