Datasheet > A3903EEETR-T

A3903EEETR-T

更新时间： 2024-01-09 00:39:08

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

Functional Description

Voltage Regulation The A3903 regulates the voltage

across the motor coil. The voltage across the OUTA

and OUTB terminal is sensed and compared to an

internal threshold voltage. The high-side switch will

be driven in linear mode to keep the applied voltage

maintained at the calculated level, as follows:

Dropout Mode The source and sink drivers have a

total R_DS(on)of approximately 1.2 Ω total. When the

motor supply voltage, V_DD, drops too low compared

to the regulated value, the IC enters dropout mode. In

this case, the voltage across the motor coil will be:

V_MOTOR= V_DD– I_LOAD(R_DS(sink)+ R_DS(src)

)

_OUT= 4 × V_REF(R₂/[R₁+R₂]) ,

Brake Mode When both inputs are high, the A3903

goes into high-side brake mode (turns on both source

drivers). There is no protection during braking, so care

must be taken to ensure that the peak current does not

where V_REF(VBG) is 1.285 V typical.

Then, for forward mode:

V_OUT= V_OUTA– V_OUTB

and for reverse mode:

_OUT= V_OUTB– V_OUTA

exceed the absolute maximum current, I_OUT

Standby Mode To minimize battery drain, standby

mode will turn off all of the circuitry and draw typi-

cally less than 100 nA from the VDD line. There will

be a very short delay, approximately 2 μs, before

enabling the output drivers after release of standby

mode.

The alternative method is to provide a tightly regu-

lated voltage to the motor supply pin and run the

source and sink drivers as switches. The voltage drop

across these switches will vary linearly with tempera-

ture and current, therefore the voltage across the motor

coil also will vary. The A3903 will eliminate these

sources of error for a system where controlling the

motor voltage is the optimum means of control.

Power Dissipation. Power can be approximated

based on the below three components:

Thermal Shutdown The A3903 will disable the out-

puts if the junction temperature, T_J, reaches 165°C.

There is 15°C of hysteresis, so when the junction

temperature drops below 150°C, the device will begin

to operate normally.

P_D(src)= I_LOAD(V_DD–V_REG) ,

P_D(sink)= I_LOAD× R_DS(sink), and

P_bias= V_DD× I_DD.

Control Logic Table

Settings

Resulting Mode

OUTB

IN1

IN2

OUTA

Off

Standby

Reverse

Forward

Brake

Low

V_REG

Low

High

V_REG

High

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

1 2 3 456 7 8

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