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| 型号： | A4979GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 15/44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
When a motor is stopped or moving slowly there is no back EMF
to impede the current in the phase windings. This allows the
current to rise to the limit quickly and the PWM current control
to activate. However, when a motor is running at speed the back
EMF, generated by the speed of the magnetic poles in the motor
passing the phase windings, acts against the supply voltage and
reduces the rise time of the phase current. Therefore the PWM
current control takes longer to activate. Assuming a constant step
rate, this results in fewer PWM cycles for each step of the motor.
The A4979 uses this difference to detect a motor changing from
continuous stepping to stalled. Two PWM counters, one for each
phase, accumulate the number of PWM cycles when the phase
current is stepped from zero to full current. At the end of each
phase current rise, the counter for that phase is compared to the
counter for the previous current rise, in the opposite phase. If the
difference is greater than the number in the PWM compare regis-
ter, then the ST bit in the diagnostic registers is set. In addition, if
the ST signal is selected as the output on the DIAG pin, then the
pin will go low.
This stall detection scheme assumes a number of factors:
? The motor must be stepping fast enough for the back EMF to
reduce the phase current slew rate. Stall detection reliability
improves as the current slew rate reduces.
? The motor is not being stepped in full step mode.
? The phase current table must conform to the 0% and ±100%
conditions at steps 0, 16, 32, and 48.
? The phase current profiles must be the same for both phases.
Although stall detection cannot be guaranteed using this detection
method, good stall detection reliability can be achieved by care-
ful selection of motor speed, count difference, and by conforming
to the above factors.
In addition to using the integrated features of the A4979, it is
also possible to perform stall detection by examining the PWM
on-time for a single phase using an external microcontroller. In
the A4979 the PWM-on signal for phase A can be selected as the
output on the DIAG pin, by using the serial interface.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
15
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| A4982SLPTR-T | IC DRIVER MICROSTEPPING 24-TSSOP |
| A4983SETTR-T | IC MOTOR DRIVER MICROSTEP 28-QFN |
| A4984SLPTR-T | IC STEPPER MOTOR DRIVER 24TSSOP |
| A4985SETTR-T | IC STEPPER MOTOR DRIVER 32QFN |
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: |
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| 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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