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| 型号： | A4975SB-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 9/13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
false trips of the comparator under normal operating conditions.
For optimal regulation of the load current, this value for C T is
recommended and the value of R T can be sized to determine t OFF .
Thermal Considerations. Thermal-protection circuitry
turns off all output transistors when the junction temperature
reaches approximately +165°C. This is intended only to protect
the device from failures due to excessive junction temperatures
and should not imply that output short circuits are permitted. The
output transistors are re-enabled when the junction temperature
cools to approximately +150°C.
Stepper Motor Applications. The A4975 is used to
optimize performance in microstepping/sinusoidal stepper-motor
drive applications (see ? gures 4 and 5). When the load current
is increasing, the slow current-decay mode is used to limit the
switching losses in the driver and iron losses in the motor. This
also improves the maximum rate at which the load current can
increase (as compared to fast decay) due to the slow rate of
decay during t OFF . When the load current is decreasing, the mixed
current-decay mode is used to regulate the load current to the
desired level. This prevents tailing of the current pro ? le caused
by the back-EMF voltage of the stepper motor (see ? gure 3A).
BRIDGE A
V BB
BRIDGE B
V PFD
V REF
1
2
16
15
47 F
D 0A
D 1B
9
10
8
7
D2B
PHASE B
3
4
14
13
11
12
6
5
+5 V
LOGIC
LOGIC
5
12
13
4
+5 V
6
11
D0B
14
3
PHASE A
7
10
47 F
15
2
V REF
D2A
8
9
D 1A
V BB
16
1
V PFD
Dwg. EP-047-3
Figure 4 — Typical Application
MIXED DECAY
SLOW DECAY
MIXED DECAY
SLOW DECAY
Dwg. WK-004-3
Figure 5 — Microstepping/Sinusoidal Drive Current
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
9
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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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