- 您现在的位置：买卖IC网 > PDF目录1773 > A3981KLPTR-T (Allegro Microsystems Inc)IC MOTOR DVR MICROSTEP 28-TSSOP PDF资料下载
参数资料
| 型号： | A3981KLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 38/43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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页当前第38页第39页第40页第41页第42页第43页
A3981
Automotive, Programmable Stepper Driver
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°.
Torque Ripple
Now, the torque output of any electrical motor is directly propor-
tional to the magnitude of the motor current, and the motor cur-
rent is the resultant phase current. It is clear from figure A4 that
the resultant phase current at the half-step position is higher than
the current at the full-step position. This means that the motor
torque will be changing as the motor rotates, resulting in what is
known as torque ripple . Torque ripple in any rotating system will
cause mechanical vibration and will result in increased audible
noise and possible wear on other mechanical components. Torque
ripple can be reduced by ensuring that the resultant current at the
half-step point has the same magnitude as the full current in the
single phase at the full-step positions.
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 uncompensated half step
Figure A4. Phase diagram for uncompensated half step
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
38
相关PDF资料 |
PDF描述 |
|---|---|
| A3982SLB-T | IC MOTOR DRIVER STEPPER 24-SOIC |
| A3983SLP-T | IC MICRO STEPPING DRIVER 24-TSSO |
| A3984SLP-T | IC MICRO STEPPING DRIVER 24-TSSO |
| A3986SLDTR-T | IC DRIVER MICROSTEPPING 38-TSSOP |
| A3987SLPTR-T | IC DRIVER MICROSTEPPING 24-TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。