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参数资料
| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 39/44页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRVR MICRO STEP 28TSSOP |
| 特色产品： | A4979 Series |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器，PWM 电机驱动器，步进电机驱动器 |
| 评估套件： | 可供 |
| 输出数： | 1 |
| 电流 - 输出： | 1.5A |
| 电压 - 负载： | 7 V ~ 50 V |
| 电源电压： | 3 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（0.173"，4.40mm 宽）裸露焊盘 |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | 620-1463-6 |
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A4979
Microstepping Programmable Stepper Motor Driver
With Stall Detect and Short Circuit Protection
Torque Ripple
Now, the torque output of any electrical motor is directly propor-
tional to the magnitude of the motor current, and the motor cur-
rent is the resultant phase current. It is clear from figure A4 that
the resultant phase current at the half-step position is higher than
the current at the full-step position. This means that the motor
torque will be changing as the motor rotates, resulting in what is
known as torque ripple . Torque ripple in any rotating system will
cause mechanical vibration and will result in increased audible
noise and possible wear on other mechanical components. Torque
ripple can be reduced by ensuring that the resultant current at the
half-step point has the same magnitude as the full current in the
single phase at the full-step positions.
Improved Half Step
Figure A5 shows a circle superimposed on the phase diagram.
This circle represents the required locus of the resultant phase cur-
rent vectors to maintain 100% current magnitude. At the full-step
positions, 0, 2, 4, and 6, only one phase is active and the magni-
tude of the phase current is at 100%. At the half-step positions, 1,
3, 5, and 7, both phases are active. To ensure that the magnitude
of the resultant current is 100%, the magnitude of each phase cur-
rent must be 70.7%. Calculating the value of the resultant current
as before gives a resultant current of 100%.
Phase A
Current
2 F
0.707 2 + 0.707 2 =
0.5 + 0.5 =
1 = 1
H
3
1
H
Resultant
The current vectors at half-step position 1 are shown specifically
to illustrate that the magnitude of the resultant sits on the 100%
circle.
For a standard stepper motor to operate with minimum torque
4
F
0
F
Phase B
Current
ripple, the resultant current must always lie on the constant torque
circle irrespective of the number of microsteps. For higher resolu-
tion microstepping this then defines the relative phase currents at
each microstep position.
H
5
6
F
7
H
Quarter Step
For example consider the next resolution in microstepping; quar-
ter step. The locus of the required phase currents are shown in
Figure A5. Phase diagram for improved half step
I A
figure A6. The required current level in each phase can be calcu-
lated using simple trigonometry. For example, consider microstep
position 7 in figure A6 as detailed in figure A7.
6
5
4
3
2
8
7
1
0
I B
7
6
I A
I A7
9
15
=sin22.5°
10
11
12
13
14
8
22.5°
I B
I B7 =-cos22.5°
Figure A6. Phase diagram for quarter step
Figure A7. Calculating phase current magnitudes
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A-5
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相关代理商/技术参数 |
参数描述 |
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| A4980 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A4980 is a flexible microstepping motor driver with built-in translator for easy operation. |
| A4980KLP-T | 制造商:Allegro MicroSystems LLC 功能描述: |
| A4980KLPTR-T | 功能描述:IC STEPPER DVR PROGR 28-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:步进电机驱动器，1-2 相，2 相 评估套件:- 输出数:1 电流 - 输出:800mA 电压 - 负载:10 V ~ 28 V 电源电压:4.75 V ~ 5.25 V 工作温度:-20°C ~ 90°C 安装类型:表面贴装 封装/外壳:28-SOP + 2 翼片裸露焊盘 供应商设备封装:28-HSOPHC（15.2x7.9） 包装:剪切带 (CT) 其它名称:869-1268-1 |
| A4982 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DMOS Microstepping Driver with Translator And Overcurrent Protection |
| A4982_V4 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DMOS Microstepping Driver with Translator And Overcurrent Protection |
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