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A4975SLBTR-T

更新时间： 2024-01-19 17:10:01
品牌 Logo 应用领域
急速微 - ALLEGRO 驱动器运动控制电子器件信号电路光电二极管电动机控制电机PC
页数 文件大小 规格书
13页 314K
描述
Full-Bridge PWM Microstepping Motor Driver

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A4975SLBTR-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：compliantHTS代码：8542.39.00.01
风险等级：1.14Samacsys Confidence：4
Samacsys Status：Released2D Presentation：https://componentsearchengine.com/2D/0T/338047.1.1.png
Schematic Symbol：https://componentsearchengine.com/symbol.php?partID=338047PCB Footprint：https://componentsearchengine.com/footprint.php?partID=338047
3D View：https://componentsearchengine.com/viewer/3D.php?partID=338047Samacsys PartID：338047
Samacsys Image：https://componentsearchengine.com/Images/9/A4975SLBTR-T.jpgSamacsys Thumbnail Image：https://componentsearchengine.com/Thumbnails/1/A4975SLBTR-T.jpg
Samacsys Pin Count：16Samacsys Part Category：Integrated Circuit
Samacsys Package Category：Small Outline PackagesSamacsys Footprint Name：16 SOICW
Samacsys Released Date：2016-09-07 08:58:06Is 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-G16JESD-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 mmBase Number Matches：1

A4975SLBTR-T 数据手册

 浏览型号A4975SLBTR-T的Datasheet PDF文件第3页浏览型号A4975SLBTR-T的Datasheet PDF文件第4页浏览型号A4975SLBTR-T的Datasheet PDF文件第5页浏览型号A4975SLBTR-T的Datasheet PDF文件第7页浏览型号A4975SLBTR-T的Datasheet PDF文件第8页浏览型号A4975SLBTR-T的Datasheet PDF文件第9页 
A4975  
Full-Bridge PWM Microstepping Motor Driver  
which turns off the source drivers (slow-decay mode) or the sink  
and source drivers (fast- or mixed-decay mode).  
Functional Description  
Two A4975 full-bridge PWM microstepping motor drivers are  
needed to drive the windings of a bipolar stepper motor. Internal  
pulse width modulated (PWM) control circuitry regulates each  
motor winding current. The peak motor current is set by the  
value of an external current-sense resistor (RS), a reference  
voltage (VREF), and the digital-to-analog converter (DAC) data  
inputs (D0, D1, and D2).  
With the DAC data input lines at VIN(1) voltage, the maximum  
value of current limiting is set by the selection of RS and VREF  
with a transconductance function approximated by:  
ITRIP ≈ VREF / 5RS.  
The actual peak load current (IPEAK) will be slightly higher than  
ITRIP due to internal logic and switching delays. The driver(s)  
remain off for a time period determined by a user-selected  
external resistor-capacitor combination (RTCT). At the end of  
the fixed off-time, the driver(s) are re-enabled, allowing the load  
current to increase to ITRIP again, maintaining an average load  
current.  
To improve motor performance, especially when using  
sinusoidal current profiles necessary for microstepping, the  
A4975 has three distinct current-decay modes: slow decay, fast  
decay, and mixed decay.  
PHASE Input. The PHASE input controls the direction of  
current flow in the load (table 1). An internally generated dead  
time of approximately 500 ns prevents crossover currents that  
could occur when switching the PHASE input.  
The DAC data input lines are used to provide up to eight levels  
of output current. The internal 3-bit digital-to-analog converter  
reduces the reference input to the current-sense comparator  
in precise steps (the step reference current ratio or SRCR) to  
provide half-step, quarter-step, or “microstepping” load-current  
levels.  
DAC Data Inputs (D0, D1, D2). A non-linear DAC is used  
to digitally control the output current. The output of the DAC is  
used to set the trip point of the current-sense comparator. Table 3  
shows DAC output voltages for each input condition. When D0,  
D1, and D2 are all logic low, all of the power output transistors  
are turned off.  
ITRIP ≈ SRCR x VREF / 5RS  
Slow Current-Decay Mode. When VPFD ≥ 3.5 V, the  
device is in slow current-decay mode (the source drivers are  
disabled when the load current reaches ITRIP). During the fixed  
off-time, the load inductance causes the current to recirculate  
through the motor winding and sink drivers (see figure 1).  
Slow-decay mode produces low ripple current for a given fixed  
off-time (see figure 2). Low ripple current is desirable because  
the average current in the motor winding is more nearly equal  
to the desired reference value, resulting in increased motor  
Internal PWM Current Control. Each motor driver  
contains an internal fixed off-time PWM current-control circuit  
that limits the load current to a desired value (ITRIP). Initially,  
a diagonal pair of source and sink transistors are enabled and  
current flows through the motor winding and RS (figure 1). When  
the voltage across the sense resistor equals the DAC output  
voltage the current-sense comparator resets the PWM latch,  
V
BB  
I
PEAK  
SLOW (V  
PFD  
≥ 3.5 V)  
MIXED (1.1 V ≤ V  
≤ 3.1 V)  
PFD  
FAST (V  
≤ 0.8 V)  
PFD  
PFD  
t
OFF  
Dwg. WP-031-1  
Drive Current (Normal)  
R
S
Recirculation (Fast Decay)  
Recirculation (Slow Decay)  
Figure 2 — Current-Decay Waveforms  
Figure 1 — Load-Current Paths  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff  
6
Worcester, Massachusetts 01615-0036 U.S.A.  
1.508.853.5000; www.allegromicro.com  
1...3456789...13

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