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| 型号： | A3953SLBTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DRIVER PWM FULL 16-SOIC |
| 标准包装： | 1 |
| 应用： | PWM 电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | ±1.3A |
| 电压 - 负载： | 3 V ~ 50 V |
| 电源电压： | 3 V ~ 5.5 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 标准包装 |
| 产品目录页面： | 1140 (CN2011-ZH PDF) |
| 其它名称： | 620-1133-6 |
A3953
FUNCTIONAL DESCRIPTION
Internal PWM Current Control During Forward
and Reverse Operation. The A3953 contains 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
peak value of the current limiting (I TRIP ) is set by the selection
of an external current sensing resistor (R S ) and reference input
voltage (V REF ). The internal circuitry compares the voltage
across the external sense resistor to the voltage on the reference
input terminal (REF) resulting in a transconductance function
approximated by:
Full-Bridge PWM Motor Driver
The user selects an external resistor (R T ) and capacitor (C T ) to
determine the time period (t OFF = R T x C T ) during which the
drivers remain disabled (see RC Fixed Off-Time section, below).
At the end of the RC interval, the drivers are enabled allowing
the load current to increase again. The PWM cycle repeats,
maintaining the peak load current at the desired value (figure 2).
Figure 2
Fast and Slow Current-Decay Waveforms
ENABLE
I TRIP ≈
V REF
R S
– I SO
MODE
where I SO is the offset due to base drive current.
In forward or reverse mode the current-control circuitry limits
the load current as follows: when the load current reaches I TRIP ,
the comparator resets a latch that turns off the selected source
LOAD
CURRENT
I
TRIP
RC
RC
driver or selected sink and source driver pair depending on
whether the device is operating in slow or fast current-decay
mode, respectively.
In slow current-decay mode, the selected source driver is
disabled; the load inductance causes the current to recirculate
through the sink driver and ground clamp diode. In fast current-
decay mode, the selected sink and source driver pair are
disabled; the load inductance causes the current to flow from
ground to the load supply via the ground clamp and flyback
diodes.
Figure 1 — Load-Current Paths
Dwg. WP-015-1
INTERNAL PWM CURRENT CONTROL
DURING BRAKE-MODE OPERATION
Brake Operation - MODE Input High. 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
back-EMF voltage resulting in current flow that dynamically
brakes the motor. If the back-EMF voltage is large, and there
RS
V
BB
DRIVE CURRENT
RECIRCULATION (SLOW-DECAY MODE)
RECIRCULATION (FAST-DECAY MODE)
Dwg. EP-006-13A
is no PWM current limiting, the load current can increase to a
value that approaches that of a locked rotor condition. To limit
the current, when the I TRIP level is reached, the PWM circuit
disables the conducting sink drivers. The energy stored in the
motor inductance is discharged into the load supply causing the
motor current to decay.
As in the case of forward/reverse operation, the drivers are
enabled after a time given by t OFF = R T x C T (see RC Fixed
Off-Time section, below). Depending on the back-EMF voltage
(proportional to the motor decreasing speed), the load current
again may increase to I TRIP . If so, the PWM cycle will repeat,
limiting the peak load current to the desired value.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
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| A3955SB | 功能描述:IC MOTOR DRIVER PWM FULL 16-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
| A3955SB-T | 功能描述:IC MOTOR DRIVER PWM FULL 16-DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:直流电机驱动器，步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP（0.295"，7.50mm 宽） 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR |
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