A4975SB-T

更新时间： 2024-01-11 11:46:45

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
13页	314K
描述
Full-Bridge PWM Microstepping Motor Driver

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技术参数
数据手册

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A4975SB-T 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOP, SOP16,.4	针数：	16
Reach Compliance Code：	compliant	HTS代码：	8542.39.00.01
风险等级：	1.14	Samacsys Confidence：	4
Samacsys Status：	Released	2D Presentation：	https://componentsearchengine.com/2D/0T/338047.1.1.png
Schematic Symbol：	https://componentsearchengine.com/symbol.php?partID=338047	PCB Footprint：	https://componentsearchengine.com/footprint.php?partID=338047
3D View：	https://componentsearchengine.com/viewer/3D.php?partID=338047	Samacsys PartID：	338047
Samacsys Image：	https://componentsearchengine.com/Images/9/A4975SLBTR-T.jpg	Samacsys Thumbnail Image：	https://componentsearchengine.com/Thumbnails/1/A4975SLBTR-T.jpg
Samacsys Pin Count：	16	Samacsys Part Category：	Integrated Circuit
Samacsys Package Category：	Small Outline Packages	Samacsys Footprint Name：	16 SOICW
Samacsys Released Date：	2016-09-07 08:58:06	Is Samacsys：	N
其他特性：	ALSO REQUIRE 5V TO 50V	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
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：	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)：	4.5 V
标称供电电压 (Vsup)：	5 V	表面贴装：	YES
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

A4975SB-T 数据手册

A4975

Full-Bridge PWM Microstepping Motor Driver

performance in microstepping applications.

For a given level of ripple current, slow decay affords the lowest

PWM frequency, which reduces heating in the motor and driver

IC due to a corresponding decrease in hysteretic core losses and

switching losses respectively. Slow decay also has the advantage

that the PWM load current regulation can follow a more rapidly

increasing reference before the PWM frequency drops into the

audible range. For these reasons slow-decay mode is typically

used as long as good current regulation can be maintained.

Under some circumstances slow-decay mode PWM can fail to

maintain good current regulation:

1) The load current will fail to regulate in slow-decay mode

due to a sufﬁciently negative back-EMF voltage in conjunction

with the low voltage drop across the load during slow decay

recirculation. The negative back-EMF voltage can cause the load

current to actually increase during the slow decay off time. A

negative back-EMF voltage condition commonly occurs when

driving stepping motors because the phase lead of the rotor

typically causes the back-EMF voltage to be negative towards

the end of each step (see ﬁgure 3A).

A — Slow-Decay

2) When the desired load current is decreased rapidly, the slow

rate of load current decay can prevent the current from following

the desired reference value.

3) When the desired load current is set to a very low value, the

current-control loop can fail to regulate due to its minimum duty

cycle, which is a function of the user-selected value of t_OFFand

the minimum on-time pulse width t_on(min)that occurs each time

the PWM latch is reset.

B — Fast-Decay

Fast Current-Decay Mode. When V_PFD< 0.8 V, the

device is in fast current-decay mode (both the sink and source

drivers are disabled when the load current reaches I_TRIP, and the

opposite pair is turned on). During the ﬁxed off-time, the load

inductance causes the current to ﬂow from ground to the load

supply via the motor winding and the opposite pair of transistors

(see ﬁgure 1). Because the full motor supply voltage is across

the load during fast-decay recirculation, the rate of load current

decay is rapid, producing a high ripple current for a given ﬁxed

off-time (see ﬁgure 2). This rapid rate of decay allows good

current regulation to be maintained at the cost of decreased

average current accuracy or increased driver and motor losses.

C — Mixed-Decay

Figure 3 — Sinusoidal Drive Currents

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

1...4 5 678 9 10...13

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型号	品牌	描述	获取价格	数据表
A4975SLBTR-T	ALLEGRO	Full-Bridge PWM Microstepping Motor Driver	获取价格
A4979	ALLEGRO	The A4979 is a flexible microstepping motor driver with built-in translator for easy opera	获取价格
A4980	ALLEGRO	The A4980 is a flexible microstepping motor driver with built-in translator for easy opera	获取价格
A4980KLP-T	ALLEGRO	The A4980 is a flexible microstepping motor driver with built-in translator for easy opera	获取价格
A4980KLPTR-T	ALLEGRO	The A4980 is a flexible microstepping motor driver with built-in translator for easy opera	获取价格
A4982	ALLEGRO	DMOS Microstepping Driver with Translator and Overcurrent Protection	获取价格

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