参数资料
型号: A3968SLBTR
厂商: Allegro Microsystems Inc
文件页数: 1/8页
文件大小: 0K
描述: IC MOTOR DRIVER PWM DUAL 16SOIC
标准包装: 1,000
应用: PWM 电机驱动器
输出数: 2
电流 - 输出: ±650mA
电压 - 负载: 4.75 V ~ 30 V
电源电压: 4.75 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: 带卷 (TR)
A3968
Dual Full-Bridge PWM Motor Driver
Features and Benefits
? ±650 mA continuous output current
? 30 V output voltage rating
? Internal fixed-frequency PWM current control
? Satlington? sink drivers
? Brake mode
? User-selectable blanking window
? Internal ground-clamp and flyback diodes
? Internal thermal-shutdown circuitry
? Crossover-current protection and UVLO protection
Package: 16 pin SOIC (suffix LB)
Not to scale
Description
The A3968 bidirectionally controls two DC motors. The device
includes two full-bridges capable of continuous output currents
of ±650 mA and operating voltages to 30 V. Motor winding
current can be controlled by the internal fixed-frequency,
pulse-width modulated (PWM), current-control circuitry. The
peak load current limit is set by user selection of a reference
voltage and current-sensing resistors.
The fixed-frequency pulse duration is set by a user-selected
external RC timing network. The capacitor in the RC timing
network also determines a user-selectable blanking window that
prevents false triggering of the PWM current-control circuitry
during switching transitions.
To reduce on-chip power dissipation, the full-bridge power
outputs have been optimized for low saturation voltages. The
sink drivers feature the Allegro ? patented Satlington ? output
structure. The Satlington outputs combine the low voltage drop
of a saturated transistor and the high peak current capability
of a Darlington.
For each bridge, the INPUT A and INPUT B terminals determine
the load-current polarity by enabling the appropriate source and
sink driver pair. When a logic low is applied to both INPUTs
Continued on the next page…
Typical Application
MOTOR 1
1
16
MOTOR 2
INPUT 1A
INPUT 1B
2
3
4
LOGIC
V
BB
LOGIC
15
14
13
INPUT 2A
INPUT 2B
+5 V
0.5 Ω
5
6
12
11
0.5 Ω
+24 V
7
V
BB
V
CC
10
+5 V
8
V REF
RC
9
47 μ F
Dwg. EP-047-6
29319.29G
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