参数资料
型号: AMIS30623C623BG
厂商: ON Semiconductor
文件页数: 31/61页
文件大小: 0K
描述: IC MOTOR DRIVER/CTLR 32NQFP
标准包装: 40
应用: 步进电机驱动器
评估套件: 可供
输出数: 1
电流 - 输出: 800mA
电源电压: 6.5 V ~ 29 V
工作温度: -40°C ~ 165°C
安装类型: 表面贴装
封装/外壳: 32-VQFP 裸露焊盘
供应商设备封装: 32-NQFP(7x7)
包装: 管件
AMIS ? 30623
Motordriver
Current Waveforms in the Coils
Figure 17 below illustrates the current fed to the motor coils by the motordriver in half ? step mode.
Ix
Iy
Coil X
t
Coil Y
Figure 17. Current Waveforms in Motor Coils X and Y in Halfstep Mode
Whereas Figure 18 below shows the current fed to the coils in 1/16 th micro stepping (1 electrical period).
Coil X
Iy
Ix
t
Coil Y
Figure 18. Current Waveforms in Motor Coils X and Y in 1/16 th Micro ? Step Mode
PWM Regulation
In order to force a given current (determined by <Irun>
or <Ihold> and the current position of the rotor) through
the motor coil while ensuring high energy transfer
efficiency, a regulation based on PWM principle is used. The
regulation loop performs a comparison of the sensed output
current to an internal reference, and features a digital
regulation generating the PWM signal that drives the output
switches. The zoom over one micro ? step in the Figure 18
above shows how the PWM circuit performs this regulation.
To reduce the current ripple, a higher PWM frequency is
selectable. The RAM register PWMfreq is used for this.
Table 22. PWM FREQUENCY SELECTION
PWMfreq Applied PWM Frequency
0 22,8 kHz
1 45,6 kHz
PWM Jitter
To lower the power spectrum for the fundamental and
higher harmonics of the PWM frequency, jitter can be added
to the PWM clock. The RAM register <PWMJEn> is used
for this.
Table 23. PWM JITTER SELECTION
PWMJEn
0
1
http://onsemi.com
31
Status
Single PWM frequency
Added jitter to PWM frequency
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