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NJM3517D2 参数 Datasheet PDF下载

NJM3517D2图片预览
型号: NJM3517D2
PDF下载: 下载PDF文件 查看货源
内容描述: 步进电机控制器/驱动器 [STEPPER MOTOR CONTROLLER / DRIVER]
分类和应用: 驱动器电动机控制电机控制器
文件页数/大小: 12 页 / 191 K
品牌: NJRC [ NEW JAPAN RADIO ]
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NJM3517  
RExt  
VZ  
R
i
Figure 14. Zener diode turn-off circuit  
Figure 12. Diode turn-off circuit  
Figure 13. Resistance turn-off circuit  
V
V
2
C
1
S
0V  
Power supply  
Figure 15. Power return turn-off circuit  
Figure 16. Power return turn-off circuit  
for bi-level  
INPUT AND OUTPUT SIGNALS FOR DIFFERENT DRIVE MODES  
The pulse diagrams, figures 7 through 10, show the necessary input signals and the resulting output signals for  
each drive mode.  
On the left side are the input and output signals, the next column shows the state of each signal at the cursor  
position marked “C.”  
STEP is shown with a 50% duty cycle, but can, of course, be with any duty cycle, as long as pulse time (tp) is  
within specifications.  
P and P are displayed with low level, showing current sinking.  
LAA and LBBare displayed with high level, showing current sourcing.  
USER HINTS  
1. Never disconnect ICs or PC-boards when power is supplied.  
2. If second supply is not used, disconnect and leave open VSS, LA, LB, and RC. Preferably replace the VMM supply  
diodes (D1, D2) with a straight connection.  
3. Remember that excessive voltages might be generated by the motor, even though clamping diodes are used.  
4. Choice of motor. Choose a motor that is rated for the current you need to establish desired torque. A high  
supply voltage will gain better stepping performance. If the motor is not specified for the VMM voltage, a current  
limiting resistor will be necessary to connect in series with center tap. This changes the L/R time constant.  
5. Never use LA or LB for continuous output at high currents. LA and L on-time can be altered by changing the RC  
net. An alternative is to trigger the mono-flip-flop by taking a STEPBand then externally pulling the RC pin  
(12Pin) low (0V) for the desired on-time.  
6. Avoid VMM and VSS power supplies with serial diodes (without filter capacitor) and/or common ground with VCC.  
The common place for ground should be as close as possible to the IC’s ground pin (pin 3).