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参数资料
| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 22/44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
Application Information
Motor Movement Control
The A4979 provides two independent methods to control the
movement of a stepper motor. The simpler is the Step and Direc-
tion method, which only requires two control signals to control
the stepper motor in either direction. The other method is through
the serial interface, which provides more flexible control capa-
bility. Both methods can be used together (although it is not
common), provided the timing restrictions of the STEP input in
relation to the STRn input are preserved.
Phase Table and Phase Diagram
The key to understanding both of the available control methods
lies in understanding the Phase Current table (table 7). This table
contains the relative phase current magnitude and direction for
each of the two motor phases at each microstep position. The
maximum resolution of the A4979 is one-sixteenth microstep.
That is 16 microsteps per full step. There are 4 full steps per elec-
trical cycle, so the phase current table has 64 microstep entries.
The entries are numbered from 0 to 63. This number represents
I A
the phase angle within the full 360° electrical cycle and is called
the Step Angle Number. This is illustrated in figure 3.
Figure 5 shows the contents of the phase current table as a phase
diagram. The phase B current, I B , from the phase current table, is
plotted on horizontal axis and the phase A current, I A , is plotted
on the vertical axis. The resultant motor current at each microstep
is shown as numbered radial arrows. The number shown corre-
sponds to the one-sixteenth microstep Step Angle Number in the
phase current table.
Figure 4 shows an example of calculating the resultant motor
current magnitude and angle for step number 28. The target is to
have the magnitude of the resultant motor current be 100% at all
microstep positions. The relative phase currents from the phase
current table are:
I A = 37.50%
I B = –92.19%
Assuming a full scale (100%) current of 1A means that the two
phase currents are:
I A = 0.3750 A
25
24
23
22
21
20
19
18 17 16 15 14
13
12
11
10
9
8
7
I B = -0.9219 A
26
27
6
5
28
29
30
31
4
3
2
1
25
26
24
I A
32
33
0
63
I B
27
28
I A28
34
35
36
37
62
61
60
59
29
30
31
α 28 =
157.9°
=37.5%
I B
38
39
40
41
42
43
44
45
46 47 48 49 50
51
52
53
54
55
56
57
58
32
I B28 = – 92.19%
Figure 3. A4979 Phase Current table as a phase diagram; values shown
are referred to as the Step Angle Number
Figure 4. Calculation of resultant motor current
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
22
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相关代理商/技术参数 |
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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 |
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| 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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