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| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 38/44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
two adjacent N poles and two adjacent S poles. In this example
the currents in both phases is the same, and so the S and N poles
of the rotor now move to half way between the positions in
diagrams (a) and (c). Figure A2 only shows a single mechanical
step in total, which is one quarter of a full electrical cycle. This
sequence is the lowest resolution form of microstepping, known
as half step , and is the simplest method of driving a stepper motor
in half-step mode.
The currents are switched-on in the correct direction in sequence
and no current control is required. The current is simply defined,
in the first instance, by the resistance of the winding and the
applied voltage.
From figure A2(b) it is also apparent that varying the relative
current in each phase will make it possible to move the rotor to
any intermediate position between the four positions of figure A1,
which occur when only a single phase is energized. When there is
one intermediate position this is known as half step. When there
are three intermediate positions this is known as quarter step
and so on. Higher resolution microstepping is described in more
detail below.
Phase Current-Sequence Diagrams
Figure A3 shows the full sequence of the two phase currents illus-
trated in figure A2. This shows two electrical cycles, equivalent to
4 full mechanical steps (8 half steps). The full-step positions are
marked F and the half-step positions are marked H . Each half step
in the electrical cycle is numbered, from 0 to 7, for reference later.
This figure shows that, when discussing stepper motor control, it
is necessary to know the relative magnitude and direction of the
current in each phase. So, rather than use physical representations
of the motor, such as in figure A1 and A2, or simple time-based
current waveforms, such as figure A3, it is simpler to use a phase
diagram. For a 2-pole bipolar motor this diagram is created by
plotting the current in the two phases as orthogonal vectors, that
is, as vectors at 90° to each other as shown in figure A4.
Phase Current-Phase Diagrams
Figure A4 shows the currents of figure A3 plotted on a phase
diagram where the phase A current is represented by the vertical
line and the phase B current by the horizontal line. The half-step
numbers correspond to the numbers in figure A3. For example,
at step 1 in figure A3, the phase A current and the phase B cur-
rent are both positive and with the same magnitude. These two
currents are shown in figure A4 as the two solid arrows. Adding
these two current vectors together gives the resultant motor cur-
rent vector indicated. The resultant is the hypotenuse of a right-
angled triangle with the two other sides equal. If the other two
sides are assumed to be 1 then the magnitude of the hypotenuse
will be:
1 2 ? 1 2 ? 2 ? 1 . 41
So the resultant current vector will be 141% of the value of the
current in phase A or B, positioned at 45°.
F
H
F
H
F
H
F
H
F
H
F
H
F
H
F
H
F
Phase A
Phase
B
H
3
Current
2 F
1
H
Current
Resultant
Phase
A
Current
4
F
H
0
F
H
Phase B
Current
5
6
F
7
6
7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
Figure A3. Phase current sequence for simple half step
Figure A4. Phase diagram for simple half step
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A-4
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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 |
| 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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