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参数资料
| 型号： | A3903EEETR-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 8-DFN |
| 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： | 620-1205-6 |
A3903
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 A3903, 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 A3903 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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相关代理商/技术参数 |
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| A3903EEETR-T-CUT | 制造商:Allegro MicroSystems LLC 功能描述: |
| A3904 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Low Voltage Voice Coil Motor Driver |
| A3904ECGTR | 功能描述:IC VOICE COIL MOTOR DVR 6-WLCSP 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:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3904ECW | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Low Voltage Voice Coil Motor Driver |
| A3904EEWTR-P | 功能描述:IC MOTOR DRVR VOICE COIL LV 6DFN 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 |
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