Datasheet > A3903EEETR-T

A3903EEETR-T

更新时间： 2024-02-16 23:39:12

品牌	Logo	应用领域
急速微 - ALLEGRO		电动机控制光电二极管
页数	文件大小	规格书
8页	228K
描述
Stepper Motor Controller, 0.5A, PDSO8, 2 X 2 MM, 0.55 MM HEIGHT, LEAD FREE, MO-229UCCD, DFN-8

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A3903EEETR-T 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	SON
包装说明：	HVSON, SOLCC8,.08,20	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	7.98
模拟集成电路 - 其他类型：	STEPPER MOTOR CONTROLLER	JESD-30 代码：	S-PDSO-N8
JESD-609代码：	e3	长度：	2 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	8	最高工作温度：	85 °C
最低工作温度：	-40 °C	最大输出电流：	0.5 A
封装主体材料：	PLASTIC/EPOXY	封装代码：	HVSON
封装等效代码：	SOLCC8,.08,20	封装形状：	SQUARE
封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	峰值回流温度（摄氏度）：	260
电源：	3.3/5 V	认证状态：	Not Qualified
座面最大高度：	0.6 mm	子类别：	Motion Control Electronics
最大供电电流 (Isup)：	2 mA	最大供电电压 (Vsup)：	5.5 V
最小供电电压 (Vsup)：	3 V	标称供电电压 (Vsup)：	5 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	40	宽度：	2 mm
Base Number Matches：	1

A3903EEETR-T 数据手册

Low Voltage DC Motor Driver

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 μF cannot be located very close to the supply ter-

minal on the A3903, it is recommended that a 0.1 μF

capacitor be placed as close to the VDD terminal as

possible to provide a path for transient currents.

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.

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

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

V_IN1

IN1

IN2

V_IN2

Symbol

Parameter

V_IN1

V_IN2

I_OUT

time

Units/Division

2 V

100 mA

20 μs

Symbol

Parameter

V_IN1

V_IN2

I_OUT

time

Units/Division

2 V

100 mA

20 μs

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

1...4 5 678

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