参数资料
| 型号： | MC3PHACVPE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 15/36页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR CONTROLLER 28-DIP |
| 标准包装： | 13 |
| 应用： | AC 电机控制器，3 相 |
| 输出数： | 1 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 28-DIP（0.600"，15.24mm） |
| 供应商设备封装： | 28-PDIP |
| 包装： | 管件 |
| 产品目录页面： | 808 (CN2011-ZH PDF) |
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Digital Power Supply Bypassing
Digital Power Supply Bypassing
V DD and V SS are the digital power supply and ground pins for the MC3PHAC.
Fast signal transitions connected internally on these pins place high, short-duration current demands on
the power supply. To prevent noise problems, take special care to provide power supply bypassing at the
V DD and V SS pins. Place the bypass capacitors as close as possible to the MC3PHAC. Use a high-
frequency-response ceramic capacitor, such as a 0.1 μ F, paralleled with a bulk capacitor in the range of
1 μ F to 10 μ F for bypassing the digital power supply.
Analog Power Supply Bypassing
V DDA and V SSA are the power supply pins for the analog portion of the clock generator and analog-to-
digital converter (ADC). On the schematics in this document, analog ground is labeled with an A and other
grounds are digital grounds. Analog power is labeled as +5 A. It is good practice to isolate the analog and
digital +5 volt power supplies by using a small inductor or a low value resistor less than 5 ohms in series
with the digital power supply, to create the +5 A supply. ADC V REF is the power supply pin used for setting
the ADC’s voltage reference.
Decoupling of these pins should be per the digital power supply bypassing, described previously. ADC
V REF (pin 1) and V DDA (pin 3) shall be connected together and connected to the same potential as V DD .
Grounding Considerations
Printed circuit board layout is an important design consideration. In particular, ground planes and how
grounds are tied together influence noise immunity. To maximize noise immunity, it is important to get a
good ground plane under the MC3PHAC. It is also important to separate analog and digital grounds. That
is why, shown on the schematics, there are two ground designations, analog ground is marked with an A
and other grounds are digital grounds. GND is the digital ground plane and power supply return. GNDA
is the analog circuit ground. They are both the same reference voltage, but are routed separately, and tie
together at only one point.
Power-Up/Power-Down
When power is applied or removed, it is important that the inverter’s top and bottom output transistors in
the same phase are not turned on simultaneously. Since logic states are not always defined during power-
up, it is important to ensure that all power transistors remain off when the controller’s supply voltage is
below its normal operating level. The MC3PHAC’s PWM module outputs make this easy by switching to
a high impedance configuration whenever the 5-volt supply is below its specified minimum.
The user should use pullup or pulldown resistors on the output of the MC3PHAC’s PWM outputs to ensure
during power-up and power-down, that the inverter’s drive inputs are at a known, turned off, state.
MC3PHAC Monolithic Intelligent Motor Controller, Rev. 2
Freescale Semiconductor
15
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