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参数资料
| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 23/44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
The magnitude of the resultant will be the square root of the sum
of the squares of these two currents:
| I 28 | = I A 2 + I B 2 = 0 . 1406 + 0 . 8499 = 0 . 9953 (A)
So the resultant current magnitude is 99.53% of full scale. This
is within 0.5% of the target (100%) and is well within the ±5%
accuracy of the A4979.
The reference angle, zero degrees (0°), within the full electrical
cycle (360°), is defined as the angle where I B is at +100% and I A
is zero. Each full step is represented by 90° in the electrical cycle
so each one-sixteenth microstep is: 90°/16 steps = 5.625°. The
target angle of each microstep position with the electrical cycle
is determined by the product of the Step Angle Number and the
angle for a single microstep. So for the example of figure 5:
from the calculations above, the results for both are well within
the specified accuracy of the A4979 current control. The resultant
motor current angle and magnitude are also more than precise
enough for all but the highest precision stepper motors.
With the phase current table, control of a stepper motor is simply
a matter of increasing or decreasing the Step Angle Number
to move around the phase diagram of figure 5. This can be in
predefined multiples using the STEP input, or it can be variable
using the serial interface.
Using Step and Direction Control
The STEP input moves the motor at the microstep resolution
defined by the two microstep select variables, MS0 and MS1,
logic levels. The DIR input defines the motor direction. These
28 ( TARGET )
= 28 × 5 . 625 ° = 157 . 5 °
inputs define the output of a translator which determines the
required Step Angle Number in the phase current table. The MS0
The actual angle is calculated using basic trigonometry as:
and MS1 can be set to select full step, half step, quarter step, or
sixteenth step microstepping as follows:
= 180 + tan ? 1 ? ? A 28 ? ?
28( ACTUAL )
? I ?
? I B 28 ?
= 180 + ( ? 22 . 1 ) = 157 . 9 °
MS1
0
0
MS0
0
1
Microstep Mode
Full step
Half step
So the angle error is only 0.4°. Equivalent to about 0.1% error in
360° and well within the current accuracy of the A4979.
1
1
0
1
Quarter step
Sixteenth step
Note that each phase current in the A4979 is defined by a 6-bit
DAC. This means that the smallest resolution of the DAC is
100 / 64 = 1.56% of the full scale, so the A4979 cannot produce
a resultant motor current of exactly 100% at each microstep. Nor
can it produce an exact microstep angle. However, as can be seen
MS0 and MS1 can be accessed through the serial interface or
directly on pins 13 and 12 respectively. The values of MS0 and
MS1 are defined as the logical OR of the logic level on the input
pins and the value in Configuration Register 0. The bits in the
I A
16
I A
20
I A
16
12
24
8
24
8
24
8
28
4
I B
32
0
I B
32
0
I B
36
60
40
56
40
48
56
40
44
48
52
56
Figure 5. Full-step phase diagram
using STEP input
Figure 6. Half-step phase diagram
using STEP input
Figure 7. Quarter-step phase diagram
using STEP input
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
23
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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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