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A3966 PDF预览

A3966

更新时间： 2024-01-24 14:38:51
品牌 Logo 应用领域
急速微 - ALLEGRO 驱动器
页数 文件大小 规格书
12页 201K
描述
DUAL FULL-BRIDGE PWM MOTOR DRIVER

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A3966 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：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：1.66
Samacsys Confidence：3Samacsys Status：Released
2D Presentation：https://componentsearchengine.com/2D/0T/755.1.1.pngSchematic Symbol：https://componentsearchengine.com/symbol.php?partID=755
PCB Footprint：https://componentsearchengine.com/footprint.php?partID=7553D View：https://componentsearchengine.com/viewer/3D.php?partID=755
Samacsys PartID：755Samacsys Image：https://componentsearchengine.com/Images/9/A3966SLBTR-T.jpg
Samacsys Thumbnail Image：https://componentsearchengine.com/Thumbnails/1/A3966SLBTR-T.jpgSamacsys Pin Count：16
Samacsys Part Category：Integrated CircuitSamacsys Package Category：Small Outline Packages
Samacsys Footprint Name：16 SOICWSamacsys Released Date：2015-07-02 00:00:00
Is Samacsys：N其他特性：ALSO REQUIRES VCC TO 30V VBB SUPPLY
模拟集成电路 - 其他类型：STEPPER MOTOR CONTROLLERJESD-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：2
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：0.75 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：5 V认证状态：Not Qualified
座面最大高度：2.65 mm子类别：Motion Control Electronics
最大供电电流 (Isup)：50 mA最大供电电压 (Vsup)：5.5 V
最小供电电压 (Vsup)：4.75 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 mmBase Number Matches：1

A3966 数据手册

 浏览型号A3966的Datasheet PDF文件第2页浏览型号A3966的Datasheet PDF文件第3页浏览型号A3966的Datasheet PDF文件第4页浏览型号A3966的Datasheet PDF文件第6页浏览型号A3966的Datasheet PDF文件第7页浏览型号A3966的Datasheet PDF文件第8页 
3966  
DUAL FULL-BRIDGE  
PWM MOTOR DRIVER  
FUNCTIONAL DESCRIPTION  
Internal PWM Current Control. The A3966SA and  
A3966SLB dual H-bridges are designed to drive both  
windings of a bipolar stepper motor. Load current can be  
controlled in each motor winding by an internal fixed-  
frequency PWM control circuit. The current-control  
circuitry works as follows: when the outputs of the H-  
bridge are turned on, current increases in the motor wind-  
ing. The load current is sensed by the current-control  
comparator via an external sense resistor (RS). Load  
current continues to increase until it reaches the predeter-  
mined value, set by the selection of external current-  
The frequency of the internal clock oscillator is set by  
the external timing components RTCT. The frequency can  
be approximately calculated as:  
fosc = 1/(RT CT + tblank  
where tblank is defined below.  
)
The range of recommended values for RT and CT are  
20 kΩ to 100 kΩ and 470 pF to 1000 pF respectively.  
Nominal values of 56 kΩ and 680 pF result in a clock  
frequency of 25 kHz.  
Current-Sense Comparator Blanking. When the  
source driver is turned on, a current spike occurs due to  
the reverse-recovery currents of the clamp diodes and  
switching transients related to distributed capacitance in  
the load. To prevent this current spike from erroneously  
resetting the source enable latch, the current-control  
comparator output is blanked for a short period of time  
when the source driver is turned on. The blanking time is  
set by the timing component CT according to the equa-  
tion:  
sensing resistors and reference input voltage (VREF  
according to the equation:  
)
ITRIP = IOUT + ISO = VREF/(4 RS)  
where ISO is the sense-current error (typically 18 mA) due  
to the base-drive current of the sink driver transistor.  
At the trip point, the comparator resets the source-  
enable latch, turning off the source driver of that H-bridge.  
The source turn off of one H-bridge is independent of the  
other H-bridge. Load inductance causes the current to  
recirculate through the sink driver and ground-clamp  
diode. The current decreases until the internal clock  
oscillator sets the source-enable latches of both H-bridges,  
turning on the source drivers of both bridges. Load current  
increases again, and the cycle is repeated.  
tblank = 1900 CT (µs).  
A nominal CT value of 680 pF will give a blanking  
time of 1.3 µs.  
The current-control comparator is also blanked when  
the H-bridge outputs are switched by the PHASE or  
ENABLE inputs. This internally generated blank time is  
approximately 1 µs.  
V
PHASE  
V
BB  
BRIDGE  
ON  
+
BRIDGE ON  
SOURCE OFF  
ALL OFF  
ALL  
OFF  
I
0
OUT  
–
SOURCE  
OFF  
BRIDGE  
ON  
I
TRIP  
t
d
t
R C  
blank  
T
T
R
S
INTERNAL  
OSCILLATOR  
Dwg. EP-006-16  
Dwg. WM-003-2  
www.allegromicro.com  
5
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