A3953

更新时间： 2024-01-13 14:26:35

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器电机
页数	文件大小	规格书
14页	229K
描述
FULL-BRIDGE PWM MOTOR DRIVER

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技术参数
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A3953 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	LEAD FREE, PLASTIC, MS-013AA, SOIC-16
针数：	16	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.45	Is Samacsys：	N
其他特性：	ALSO REQUIRES 3V TO 50V VBB SUPPLY	模拟集成电路 - 其他类型：	STEPPER MOTOR CONTROLLER
JESD-30 代码：	R-PDSO-G16	JESD-609代码：	e3
长度：	10.3 mm	湿度敏感等级：	3
功能数量：	1	端子数量：	16
最高工作温度：	85 °C	最低工作温度：	-20 °C
最大输出电流：	1.3 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP16,.4
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
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：	2.65 mm
子类别：	Motion Control Electronics	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	技术：	BIPOLAR
温度等级：	OTHER	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	40
宽度：	7.5 mm	Base Number Matches：	1

A3953 数据手册

3953

FULL-BRIDGE

PWM MOTOR DRIVER

Figure 3

To minimize current-sensing inaccuracies caused by

ground trace I x R drops, the current-sensing resistor

should have a separate return to the ground terminal of

the device. For low-value sense resistors, the I x R drops

in the printed wiring board can be significant and should

be taken into account. The use of sockets should be

avoided as their contact resistance can cause variations in

the effective value of R_S.

Synchronous Fixed-Frequency Control Circuit

Generally, larger values of R_Sreduce the aforemen-

tioned effects but can result in excessive heating and

power loss in the sense resistor. The selected value of R_S

should not cause the absolute maximum voltage rating of

1.0 V (0.4 V for V_CC= 3.3 V operation), for the SENSE

terminal, to be exceeded.

1N4001

2N2222

Dwg. EP-060

Miscellaneous Information. A logic high applied to both

the ENABLE and MODE terminals puts the device into a

sleep mode to minimize current consumption when not in

use.

The current-sensing comparator functions down to

ground allowing the device to be used in microstepping,

sinusoidal, and other varying current-profile applications.

An internally generated dead time prevents crossover

currents that can occur when switching phase or braking.

Thermal Considerations. For reliable operation it is

recommended that the maximum junction temperature be

kept below 110°C to 125°C. The junction temperature can

be measured best by attaching a thermocouple to the

power tab/batwing of the device and measuring the tab

temperature, T_TAB. The junction temperature can then be

approximated by using the formula:

Thermal protection circuitry turns off all drivers should

the junction temperature reach 165°C (typical). This is

intended only to protect the device from failures due to

excessive junction temperatures and should not imply that

output short circuits are permitted. The hysteresis of the

thermal shutdown circuit is approximately 15°C.

T_J≈ T_TAB+ (I_LOADx 2 x V_Fx R_θJT

)

where V_Fmay be chosen from the electrical specification

table for the given level of I_LOAD. The value for R_θJTis

given in the package thermal resistance table for the

appropriate package.

APPLICATION NOTES

Current Sensing. The actual peak load current (I_PEAK

)

will be above the calculated value of I_TRIPdue to delays in

the turn off of the drivers. The amount of overshoot can

be approximated by:

The power dissipation of the batwing packages can be

improved by 20% to 30% by adding a section of printed

circuit board copper (typically 6 to 18 square centimeters)

connected to the batwing terminals of the device.

(V_BB– [(I_TRIPx R_LOAD) + V_BEMF]) x t_PWM(OFF)

I_OS

≈

L_LOAD

The thermal performance in applications that run at

high load currents and/or high duty cycles can be im-

proved by adding external diodes in parallel with the

internal diodes. In internal PWM slow-decay applications,

only the two ground clamp diodes need be added. For

internal fast-decay PWM, or external PHASE or ENABLE

input PWM applications, all four external diodes should be

added for maximum junction temperature reduction.

where V_BBis the motor supply voltage, V_BEMFis the back-

EMF voltage of the load, R_LOADand L_LOADare the resis-

tance and inductance of the load respectively, and

t_PWM(OFF)is specified in the electrical characteristics table.

The reference terminal has a maximum input bias

current of 5 µA. This current should be taken into

account when determining the impedance of the external

circuit that sets the reference voltage value.

PCB Layout. The load supply terminal, V_BB, should be

decoupled with an electrolytic capacitor (>47 µF is recom-

www.allegromicro.com

1...6 7 8910 11 12...14

中文翻译

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与A3953相关器件

型号	品牌	获取价格	描述	数据表
A3953KB	ETC	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953S	ETC	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SB	ALLEGRO	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SB-T	ALLEGRO	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SLB	ALLEGRO	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SLB-T	ALLEGRO	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SLBTR	ALLEGRO	获取价格	Stepper Motor Controller, 1.3A, BIPolar, PDSO16, PLASTIC, SOIC-16
A3953SLBTR-T	ALLEGRO	获取价格	FULL-BRIDGE PWM MOTOR DRIVER
A3953SLB-TTR	ALLEGRO	获取价格	暂无描述
A3955	ALLEGRO	获取价格	FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

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