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参数资料
| 型号： | A3981KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 39/43页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DVR MICROSTEP 28-TSSOP |
| 标准包装： | 1 |
| 系列： | * |
| 应用： | * |
| 输出数： | * |
| 电流 - 输出： | * |
| 电压 - 负载： | * |
| 电源电压： | * |
| 工作温度： | * |
| 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： | 620-1458-6 |
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A3981
Compensated Half Step
Automotive, Programmable Stepper Driver
The current vectors at half-step position 1 are shown specifically
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%.
to illustrate that the magnitude of the resultant sits on the 100%
circle.
For a standard stepper motor to operate with minimum torque
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.
Quarter Step
0.707 2 + 0.707 2 =
0.5 + 0.5 =
1 = 1
For example consider the next resolution in microstepping; quar-
ter step. The locus of the required phase currents are shown in
figure A6. The required current level in each phase can be calcu-
lated using simple trigonometry. For example, consider microstep
H
3
Phase A
Current
2 F
1
H
position 7 in figure A6 as detailed in figure A7.
There are 4 quarter steps for each full step. A full step on the
phase diagram is represented by 90°. So each quarter step incre-
ments the phase angle by 90° / 4 = 22.5°.
Resultant
In figure A7 the resultant motor current at quarter-step position 8
is one quarter step from the horizontal, so it is at 22.5°. The mag-
4
F
0
F
Phase B
Current
nitude of the current in phase A at quarter-step position 7, I A7 ,
is therefore sin 22.5°, which is equal to 0.383 or 38.3% of the
maximum current.
Similarly, the magnitude of the current in phase B at quarter-step
H
5
6
F
7
H
position 7, I B7 , is therefore cos 22.5°, which is equal to 0.924 or
92.4% of the maximum current.
At the 45° positions, 2, 6, 10 and 14, the magnitude of the current
Figure A5. Phase diagram for compensated half step
I A
in phase A and phase B will be cos 45° = 0.707 or 70.7%, which
is the same magnitude as in the half-step case shown in figure A5.
Due to symmetry, the phase A current is the same at quarter-step
positions 7 and 1. The phase A current at quarter-step positions
6
5
4
3
2
9 and 15 also has the same magnitude, but the current is in the
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
39
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相关代理商/技术参数 |
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|---|---|
| A3982 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DMOS Stepper Motor Driver with Translator |
| A3982_13 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:DMOS Stepper Motor Driver with Translator |
| A3982SLB | 功能描述:IC MOTOR DRIVER STEPPER 24-SOIC RoHS:否 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:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3982SLB-T | 功能描述:IC MOTOR DRIVER STEPPER 24-SOIC 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:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3982SLB-T | 制造商:Allegro MicroSystems 功能描述:Motor Driver IC |
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