参数资料
型号: A3955SLB
厂商: Allegro Microsystems Inc
文件页数: 11/14页
文件大小: 0K
描述: IC MOTOR DRIVER PWM FULL 16-SOIC
标准包装: 47
应用: 步进电机驱动器
输出数: 1
电流 - 输出: ±1.5A
电压 - 负载: 4.5 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: 表面贴装
封装/外壳: 16-SOIC(0.295",7.50mm 宽)
供应商设备封装: 16-SOIC W
包装: 管件
A3955
Full-Bridge PWM Microstepping Motor Driver
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 A3955 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 μ 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 μ 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, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
10
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