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A3951

更新时间： 2024-02-03 20:42:53
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
12页 202K
描述
FULL-BRIDGE PWM MOTOR DRIVER

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A3951 技术参数

生命周期：Obsolete零件包装代码：SFM
包装说明：,针数：12
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.83
模拟集成电路 - 其他类型：STEPPER MOTOR CONTROLLERJESD-30 代码：R-PSFM-T12
功能数量：1端子数量：12
最高工作温度：85 °C最低工作温度：-20 °C
最大输出电流：3.5 A封装主体材料：PLASTIC/EPOXY
封装形状：RECTANGULAR封装形式：FLANGE MOUNT
认证状态：Not Qualified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：NO温度等级：OTHER
端子形式：THROUGH-HOLE端子位置：SINGLE
Base Number Matches：1

A3951 数据手册

 浏览型号A3951的Datasheet PDF文件第2页浏览型号A3951的Datasheet PDF文件第3页浏览型号A3951的Datasheet PDF文件第4页浏览型号A3951的Datasheet PDF文件第6页浏览型号A3951的Datasheet PDF文件第7页浏览型号A3951的Datasheet PDF文件第8页 
3951  
FULL-BRIDGE  
PWM MOTOR DRIVER  
FUNCTIONAL DESCRIPTION  
INTERNAL PWM CURRENT CONTROL DURING  
FORWARD AND REVERSE OPERATION  
ENABLE  
The A3951SB/SW contain a fixed off-time pulse-width  
modulated (PWM) current-control circuit that can be used  
to limit the load current to a desired value. The value of  
the current limiting (ITRIP) is set by the selection of an  
external current sensing resistor (RS) and reference input  
voltage (VREF). The internal circuitry compares the  
voltage across the external sense resistor to one tenth the  
voltage on the REF input terminal, resulting in a function  
approximated by  
I
TRIP  
RC  
LOAD  
CURRENT  
Dwg. WP-015-3  
ITRIP = VREF/(10•RS).  
Figure 2 — Load-Current Waveform  
In forward or reverse mode the current-control cir-  
cuitry limits the load current. When the load current  
reaches ITRIP, the comparator resets a latch to turn off the  
selected sink driver. The load inductance causes the  
current to recirculate through the source driver and  
flyback diode (two-quadrant operation or slow decay).  
See figure 1.  
INTERNAL PWM CURRENT CONTROL DURING  
BRAKE MODE OPERATION  
The brake circuit turns off both source drivers and  
turns on both sink drivers. For dc motor applications, this  
has the effect of shorting the motor’s back-EMF voltage,  
resulting in current flow that brakes the motor dynamically.  
However, if the back-EMF voltage is large and there is no  
PWM current limiting, then the load current can increase to  
a value that approaches a locked rotor condition. To limit  
the current, when the ITRIP level is reached, the PWM  
circuit disables the conducting sink driver. The energy  
stored in the motor’s inductance is then discharged into  
the load supply causing the motor current to decay.  
V
BB  
As in the case of forward/reverse operation, the drivers  
are re-enabled after a time given by toff = RT•CT (see “RC  
Fixed Off Time” below). Depending on the back-EMF  
voltage (proportional to the motor’s decreasing speed), the  
load current again may increase to ITRIP. If so, the PWM  
cycle will repeat, limiting the load current to the desired  
value.  
DRIVE CURRENT  
RECIRCULATION  
R
S
Dwg. EP-006-9  
Brake Operation  
Figure 1 — Load-Current Paths  
During braking, the peak current limit defaults inter-  
nally to a value approximated by  
The user selects an external resistor (RT) and capaci-  
tor (CT) to determine the time period (toff = RT•CT) during  
which the drivers remain disabled (see “RC Fixed OFF  
Time” below). At the end of the RTCT interval, the drivers  
are re-enabled allowing the load current to increase again.  
The PWM cycle repeats, maintaining the load current at  
the desired value (see figure 2).  
ITRIP = 1.5 V/RS.  
In this mode, the value of RS determines the ITRIP value  
independent of VREF. This is useful in applications with  
differing run and brake currents and no practical method of  
varying VREF  
.
www.allegromicro.com  
5
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