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参数资料
| 型号： | MC3PHACVDWE |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 11/36页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR CONTROLLER 28-SOIC |
| 标准包装： | 26 |
| 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： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 管件 |
| 产品目录页面： | 808 (CN2011-ZH PDF) |
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Features
Selectable PWM Frequency — The MC3PHAC accommodates four discrete PWM frequencies and can
be changed dynamically while the motor is running. This resistor can be a potentiometer or a fixed resistor
in the range shown in Table 4 . In standalone mode, the PWM frequency is specified by applying a voltage
to the MUX_IN pin while the PWMFREQ_RxD pin is being driven low. Table 4 shows the required voltage
levels on the MUX_IN pin and the associated PWM frequency for each voltage range.
NOTE
The PWM frequencies are based on a 4.00 MHz frequency applied to the
oscillator input.
Table 4. MUX_IN Resistance Ranges and Corresponding PWM Frequencies
Voltage Input
0 to 1 V
1.5 to 2.25 V
2.75 to 3.5 V
4 to 5 V
PWM Frequency
5.291 kHz
10.582 kHz
15.873 kHz
21.164 kHz
Selectable PWM Dead Time — Besides being able to specify the PWM frequency, the blanking time
interval between the on states of the complementary PWM pairs can also be specified. Refer to the graph
in Figure 9 for the resistance value versus dead time. Figure 9 assumes a 6.8 k ? ± 5% pullup resistor. In
standalone mode, this is done by
supplying a voltage to the MUX_IN pin while the DT_FAULTOUT pin is being driven low. In this way, dead
time can be specified with a scaling factor of 2.075 μ s per volt, with a minimum value of 0.5 μ s. In PC
master software mode, this value can be selected to be anywhere between 0 and 32 μ s.
In both standalone and PC master software modes, the dead time value can be written only once. Further
updates of this parameter are locked out until a reset condition occurs.
Speed Control — The synchronous motor frequency can be specified in real time to be any value from
1 Hz to 128 Hz by the voltage applied to the SPEED pin. The scaling factor is 25.6 Hz per volt. This
parameter can also be controlled directly from PC master software in real time.
The SPEED pin is processed by a 24-bit digital filter to enhance the speed stability in noisy environments.
This filter is only activated in standalone mode.
Acceleration Control — Motor acceleration can be specified in real time to be in the range from 0.5
Hz/second, ranging to 128 Hz/second, by the voltage applied to the ACCEL pin. The scaling factor is 25.6
Hz/second per volt. This parameter can also be controlled directly from PC master software in real time.
Voltage Profile Generation — The MC3PHAC controls the motor voltage in proportion to the specified
An ac motor is designed to draw a specified amount of magnetizing current when supplied with rated
voltage at the base frequency. As the frequency decreases, assuming no stator losses, the voltage must
decrease in exact proportion to maintain the required magnetizing current. In reality, as the frequency
decreases, the voltage drop in the series stator resistance increases in proportion to the voltage across
the magnetizing inductance. This has the effect of further reducing the voltage across the magnetizing
inductor, and consequently, the magnetizing current. A schematic representation of this effect is
MC3PHAC Monolithic Intelligent Motor Controller, Rev. 2
Freescale Semiconductor
11
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