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| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 37/44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
Starting at the top, panel (a) in figure A1, the current is flowing
down through the phase A winding from top to bottom and there
is no current in phase B. The result is an N magnetic pole on the
A electromagnets and an S pole on the A-bar electromagnets. The
rotor position is such that that the poles of the permanent magnets
align with the poles of the electromagnets, N to S.
In the next panel, panel (b), the current is flowing down through
the phase B winding from top to bottom and there is no current
in phase A. The result is an N pole on the B electromagnets and
an S pole on the B-bar electromagnets. These magnetic poles will
attract and repel the permanent magnets on the rotor producing a
force that moves the rotor from left to right in the diagram until
the poles of the permanent magnets again align with the poles of
Microstepping
In many applications it is necessary to improve the resolution of
the stepper motor, for more precise positioning control, or simply
to increase the number of steps per revolution to reduce the
torque ripple and therefore the vibration and noise of the motor.
Fortunately this can be achieved by driving both phases at the
same time in order to move the rotor to a position between two
electromagnets. This is known generically as microstepping.
Figure A2 shows the basic principle of microstepping. Panels (a)
and (c) of figure A2 correspond to panels (a) and (b) of figure
A1. Panel (b) shows each phase energized such that there are now
the electromagnets.
In panel (c), the current is flowing up through the phase A wind-
ing from bottom to top and there is no current in phase B. This
A
B
Stator
_
A
_
B
A
reverses the pole orientation from the top panel, such that there
is an S pole on the A electromagnets and an N pole on the A-bar
electromagnets. As before, these magnetic poles will attract and
N
S
S
N
N
S
A
B
(a) Same as
figure A1(a)
repel the permanent magnets on the rotor producing a force that
moves the rotor from left to right in the diagram, until poles of
the permanent magnets again align with the poles of the electro-
N
S
Rotor
N
magnets.
The bottom panel, panel (d), shows the final combination with
current flowing up through the phase B winding from bottom to
A
B
Stator
_
A
_
B
A
top and there is no current in phase A. This produces an N pole
on the B electromagnets and a S pole on the B-bar electromag-
N
N
S
S
N
A
B
(b) Half-step
position
nets. As before, these magnetic poles will attract and repel the
S
N
S
permanent magnets on the rotor producing a force that moves the
rotor from left to right until poles of the permanent magnets again
align with the poles of the electromagnets.
N
S
Rotor
N
Each of the four steps in figure A1 represents a single full
mechanical step of the stepper motor. The four steps together
represent a single electrical cycle.
A
B
Stator
_
A
_
B
A
The step resolution depends entirely on the mechanical construc-
tion of the motor and typically there will be 200 or more full
steps per mechanical revolution of the motor. A 200-step motor
N
N
S
S
N
A
B
(c) Same as
figure A1(b)
will provide a resolution of 360 / 200 = 1.8° of rotation per step.
Stepping in the opposite direction to that described above is sim-
N
S
Rotor
ply a case of changing the step sequence or inverting one of the
phase current directions.
Figure A2. Half step operation
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
A-3
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| A4984SLPTR-T | IC STEPPER MOTOR DRIVER 24TSSOP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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