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| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 40/44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
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°.
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-
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
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
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
Table A1. Quarter-Step Phase Current Magnitudes
positions 7 and 1. The phase A current at quarter-step positions
9 and 15 also has the same magnitude, but the current is in the
opposite direction. In addition the phase B current at quarter-
step positions 3, 5, 11, and 13 also have the same magnitude as
that of phase A at quarter-step position 7, with a positive current
direction for steps 3 and 13 and a negative direction for steps 5
and 11. Similar symmetry can be applied to the phase B current at
quarter-step position 7, calculated above.
This means that only five discrete current magnitudes are
required, including 0% and 100%, in order to drive the stepper
motor to all 16 quarter-step positions. Using the same nomencla-
ture as figure A7, that is, I Pn , where P is the phase, A or B, and n
is the quarter-step number from figure A6, table A1 shows where
each of the five magnitude values are used.
Figure A8 shows these values plotted as a current sequence
diagram. This figure is therefore the time-based equivalent of the
phase diagram in figure A6.
Magnitude
(%)
Phase B
Phase A
0 .
38.3
70.7
92.4
100 .
I A0
I A1
I A2
I A3
–
–
I A7
I A6
I A5
I A4
I A8
I A9
I A10
I A11
–
–
I A15
I A14
I A13
I A12
–
I B3
I B2
I B1
I B0
I B4
I B5
I B6
I B7
–
–
I B11
I B10
I B9
I B8
I B12
I B13
I B14
I B15
–
100% A
I B
100%
92%
70%
38%
0
-38%
-70%
-92%
-100%
I
92%
70%
38%
0
-38%
-70%
-92%
-100%
12 13 14 15
0
1
2
3
4
5
6
7
8
9
10 11 12
Figure A8. Phase current sequence for quarter step
Figure A9. Measured sixteenth-step phase current sequence
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A-6
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