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| 型号： | TC648EOA |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封装： | 0.150 INCH, PLASTIC, SOIC-8 |
| 文件页数： | 3/28页 |
| 文件大小： | 602K |
| 代理商： | TC648EOA |
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2002 Microchip Technology Inc.
DS21448C-page 11
TC648
deliver the desired speed at TMIN. The values for R1, R2
and RT1 are then checked at TMAX for 2.65V nominal.
It may be necessary to adjust the values of R1 and R2
after the initial calculation to obtain the desired results.
The design equations are:
EQUATION
Because the thermistor characteristics are fixed, it may
not be possible, in certain applications, to obtain the
desired values of VMIN and VMAX using the above
equations. In this case, the circuit in Figure 5-4 can be
used. Diode D1 clamps VIN to the voltage required to
sustain minimum speed. The calculations of R1 and
R2 for the temperature sensor are identical to the
equation on the previous page.
FIGURE 5-4:
Minimum Fan Speed Circuit.
5.3
Auto-Shutdown Temperature
Design
A voltage divider on VAS sets the temperature at which
the part is automatically shut down if the sensed
temperature at VIN drops below the set temperature at
VAS (i.e. VIN < VAS).
As with the VIN input, 1.25V to 2.65V corresponds to
respectively. Assuming that the temperature sensor
network designed previously is linearly related to
temperature, the shutdown temperature TAS is related
to T2 and T1 by:
EQUATION
For example, if 1.25V and 2.65V at VIN corresponds to
a temperature range of T1 = 0°C to T2 = 125°C, and the
auto-shutdown temperature desired is 25°C, then the
VAS voltage is:
EQUATION
The VAS voltage may be set using a simple resistor
divider, as shown in Figure 5-5.
FIGURE 5-5:
VAS Circuit.
R1 = (0.1)(RT1MIN)
Where: RT1 = Thermistor resistance at TMIN
R2 =
(RT1MIN)(R1)(VMIN)
(RT1MIN + R1)(VDD - VMIN)
Where VMIN = the value of VIN required for
minimum fan speed. VDD = Power Supply Voltage
VMAX =
(RT1MIN)(R1)(VMIN)
R2 (R1 + RT1MAX )(VDD)
Where RT1MAX = thermistor resistance at TMAX,
VMAX = the value of VIN required for maximum
fan speed.
R1
R2
R3
R4
D1
RT1
VDD
VIN
2.65 - 1.25V
T2 - T1
=
VAS - 1.25
TAS - T1
VAS =
1.4V
T2 - T1
(TAS - T1) + 1.25
(
)
1.4V
(125 - 0)
VAS =
(25 - 0) + 1.25 = 1.53V
R2
R1
GND
VDD
VAS
IDIV
IIN
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相关代理商/技术参数 |
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| TC648EOA713 | 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 |
| TC648EPA | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert |
| TC648EUA | 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 |
| TC648EUA713 | 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 |
| TC648VOA | 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 |
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