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参数资料
| 型号： | A3908EEETR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRIVER DC LV 500MA 8DFN |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | 500mA |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-UFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN/MLP（2x2） |
| 包装： | 标准包装 |
| 产品目录页面： | 1140 (CN2011-ZH PDF) |
| 其它名称： | 620-1282-6 |
A3908
during PWM operation and ensure that the supply
voltage remains stable at the input terminal. Bulk
capacitance is often located at a non-ideal distance
from the device. If the recommended capacitance of
10 μ F cannot be located very close to the supply ter-
minal on the A3908, it is recommended that a 0.1 μ F
capacitor be placed as close to the VDD terminal as
possible to provide a path for transient currents.
PWM Operation
In some applications current control may be desired.
Pulse width modulating the inputs will allow the
output current to be regulated. When external PWM
control is used, the VREF pin should be connected
directly to the VSET pin. This effectively disables
voltage control on the source driver, and allows
maximum current to flow through the driver. Current
I OUT
Low Voltage DC Motor Driver
is then controlled using enable chopping , described
below.
Enable Chopping By PWMing the logic inputs
between enable and brake modes, the current in the
motor winding can be controlled. It is accomplished
by holding one input high while PWMing the other
input. During the on-cycle, current flows in the bridge
consistent with the direction programmed on the input
pins. During the off-cycle, the A3908 enters brake
mode. Enable chopping is illustrated in figure 1.
Current in the motor winding is controlled by chang-
ing the duty cycle on the PWM input. As shown
in figure 2, the average current is still positive but,
because the duty cycle is less, the average current is
much lower.
I OUT
C3
V IN1
C3
V IN1
V IN2
C1
C2
t
V IN2
C1
C2
t
Symbol
C1
C2
C3
t
Parameter
V IN1
V IN2
I OUT
time
Units/Division
2V
2V
100 mA
20 μ s
Symbol
C1
C2
C3
t
Parameter
V IN1
V IN2
I OUT
time
Units/Division
2V
2V
100 mA
20 μ s
Figure 1. Enable chopping. Forward direction, output duty cycle 90%.
Figure 2. Enable chopping. Forward direction, output duty cycle 20%.
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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| A3909GLNTR-T | 功能描述:IC MOTOR DRIVER PAR 10SSOP 制造商:allegro microsystems, llc 系列:- 包装:剪切带（CT） 零件状态:有效 输出配置:半桥（4） 应用:DC 电机，通用，步进电机 接口:逻辑 负载类型:电感 技术:DMOS 导通电阻（典型值）:1.6 欧姆 LS + HS 电流 - 输出/通道:1A 电流 - 峰值输出:- 电压 - 电源:4 V ~ 18 V 电压 - 负载:4 V ~ 18 V 工作温度:-40°C ~ 150°C（TJ） 特性:- 故障保护:限流，超温 安装类型:表面贴装 封装/外壳:10-SOP（0.154"，3.90mm 宽） 供应商器件封装:10-SSOP 标准包装:1 |
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