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| 型号： | A4975SB-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC PWM MICROSTEP DVR FULL 16DIP |
| 特色产品： | A4975 Microstepping Drivers |
| 标准包装： | 7,500 |
| 应用： | PWM 电机驱动器，步进电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | 1.5A |
| 电压 - 负载： | 5 V ~ 50 V |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-DIP |
| 包装： | 管件 |
| 其它名称： | 620-1435-5 A4975SB-T-ND |
A4975
Full-Bridge PWM Microstepping Motor Driver
performance in microstepping applications.
For a given level of ripple current, slow decay affords the lowest
PWM frequency, which reduces heating in the motor and driver
IC due to a corresponding decrease in hysteretic core losses and
switching losses respectively. Slow decay also has the advantage
that the PWM load current regulation can follow a more rapidly
increasing reference before the PWM frequency drops into the
audible range. For these reasons slow-decay mode is typically
used as long as good current regulation can be maintained.
Under some circumstances slow-decay mode PWM can fail to
maintain good current regulation:
1) The load current will fail to regulate in slow-decay mode
due to a suf ? ciently negative back-EMF voltage in conjunction
with the low voltage drop across the load during slow decay
recirculation. The negative back-EMF voltage can cause the load
current to actually increase during the slow decay off time. A
negative back-EMF voltage condition commonly occurs when
driving stepping motors because the phase lead of the rotor
typically causes the back-EMF voltage to be negative towards
the end of each step (see ? gure 3A).
2) When the desired load current is decreased rapidly, the slow
rate of load current decay can prevent the current from following
the desired reference value.
3) When the desired load current is set to a very low value, the
current-control loop can fail to regulate due to its minimum duty
cycle, which is a function of the user-selected value of t OFF and
the minimum on-time pulse width t on(min) that occurs each time
the PWM latch is reset.
Fast Current-Decay Mode. When V PFD < 0.8 V, the
device is in fast current-decay mode (both the sink and source
drivers are disabled when the load current reaches I TRIP , and the
opposite pair is turned on). During the ? xed off-time, the load
inductance causes the current to ? ow from ground to the load
supply via the motor winding and the opposite pair of transistors
(see ? gure 1). Because the full motor supply voltage is across
the load during fast-decay recirculation, the rate of load current
decay is rapid, producing a high ripple current for a given ? xed
off-time (see ? gure 2). This rapid rate of decay allows good
current regulation to be maintained at the cost of decreased
average current accuracy or increased driver and motor losses.
A — Slow-Decay
B — Fast-Decay
C — Mixed-Decay
Figure 3 — Sinusoidal Drive Currents
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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相关代理商/技术参数 |
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| A4975SLBTR-T | 功能描述:IC PWM MICROSTEP DVR FULL 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 产品变化通告:ATA683(3,4)PLQW Obsolescence 09/Aug/2012 标准包装:1 系列:- 应用:DC 电机控制器，无刷（BLDC），3 相 评估套件:可供 输出数:1 电流 - 输出:100mA 电压 - 负载:5.25 V ~ 20 V 电源电压:5.25 V ~ 20 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-VQFN（7x7） 包装:剪切带 (CT) 其它名称:ATA6833-PLQWCT |
| A4979 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A4979 is a flexible microstepping motor driver with built-in translator for easy operation. |
| A4979GLPTR-T | 功能描述:IC MOTOR DRVR MICRO STEP 28TSSOP 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 |
| 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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