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参数资料
| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 41/44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
Higher Microstep Resolution
Microstepping Programmable Stepper Motor Driver
With Stall Detect and Short Circuit Protection
or even using a fast microcontroller, is a complex task. The
The principles described above can easily be extended to higher
microstep resolutions. As the microstep resolution increases, it
becomes more apparent that the phase current sequences approxi-
mate ever closer to a sin and cosine function. Figure A9 shows
the measured phase current sequence of the A4979 running in
sixteenth-step mode. The phase current sequences for eighth-step
and sixteenth-step resolutions are shown in figures A10 and A11.
Most applications using small motors are limited to sixteenth-step
mode due to the mechanical precision of the motor. Larger, high-
precision stepper motors are sometimes driven at 32, 64, or even
up to 256 microsteps in some extreme cases.
Practical Implementation
A system to drive a stepper motor with microstep capability
requires sequencers, current reference generators, and current
controllers. Developing such a system from discrete components,
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I B
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A4979 is one of several fully integrated stepper drivers that are
available with microstep resolutions, from simple half step to
sixteenth step and higher, using programmable current tables. All
aspects of the stepper control system are included in these single
chip solutions and many of them can be controlled by a simple
Step and Direction interface.
Practical limitations
The information presented here assumes ideal stepper motors
being stepped slowly, with accurate, efficient current control
circuits. In practice the stepper motor phase windings are repre-
sented by two non-ideal inductors and the motor may be driven at
a high stepping rate.
A high stepping rate will produce a back EMF, like any other
motor, that will act against any current control circuits. The
current control circuits must also be able to work with inductive
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98%
92%
83%
70%
56%
38%
19%
I A
19%
38%
56%
70%
83%
92%
98%
100%
Figure A10. Phase current sequence for eighth step
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A-7
相关PDF资料 |
PDF描述 |
|---|---|
| A4980KLPTR-T | IC STEPPER DVR PROGR 28-TSSOP |
| A4982SLPTR-T | IC DRIVER MICROSTEPPING 24-TSSOP |
| A4983SETTR-T | IC MOTOR DRIVER MICROSTEP 28-QFN |
| A4984SLPTR-T | IC STEPPER MOTOR DRIVER 24TSSOP |
| A4985SETTR-T | IC STEPPER MOTOR DRIVER 32QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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