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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： | 6/28页 |
| 文件大小： | 602K |
| 代理商： | TC648EOA |
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TC648
DS21448C-page 14
2002 Microchip Technology Inc.
FIGURE 5-7:
Powering the Fan from a -12V Supply.
5.5
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, VAS divider or shutdown circuit) are
powered by a supply different from that of the TC648.
Care should be taken to ensure that the TC648’s VDD
supply powers up first. If possible, the networks
attached to VIN and VAS should connect to the VDD 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.
5.6
Power Supply Routing and
Bypassing
Noise present on the VIN and VAS inputs may cause
erroneous operation of the OTF output. As a result,
these inputs should be bypassed with a 0.01 F capac-
itor mounted as close to the package as possible. This
is especially true of VIN, which is usually driven from a
high impedance source (such as a thermistor). Addi-
tionally, the VDD input should be bypassed with a 1 F
capacitor and grounds should be kept as short as pos-
sible. To keep fan noise off the TC648 ground pin, indi-
vidual ground returns for the TC648 and the low side of
the fan drive device should be used.
Auto-Shutdown Mode Design Example
Step 1. Calculate R1 and R2 based on using an NTC
having a resistance of 10 k
at TMIN (25°C)
and 4.65 k
at TMAX (45°C) (see Figure 5-8).
R1 = 20.5 k
R2 = 3.83 k
Step 2. Set auto-shutdown level.
VAS = 1.8V
Limit the divider current to 100 A
R5 = 33 k
R6 = 18 k
Step 3. Design the output circuit
Maximum fan motor current = 250 mA.
Q1 beta is chosen at 50 from which
R7 = 800 .
5.7
Minimum Speed Mode Design
Example
Given:
Minimum speed = 40%(1.8V)
TMIN = 30°C, TMAX = 95°C
Thermistor = 100 k
at 25°C
RTMIN = 79.4 k, RTMAX = 6.5 k
Step 1: Calculate R1:
R1 = 7.9 k (Use closest standard value:
7.87 k
)
Calculate R2:
R2 = 4.05 k (Use closest standard value:
4.02 k
)
Step 2: Verify VMAX:
VMAX = 2.64V
GND
+5V
-12V
Q1*
VDD
VOUT
TC648
Fan
R2*
2.2 k
R4*
D1
NOTE: *Value depends on the specific application and is shown for example only.
12.0V
Zener
10 k
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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