- 您现在的位置：买卖IC网 > PDF目录1773 > A4973SLBTR-T (Allegro Microsystems Inc)IC PWM MOTOR DVR FULL 16SOIC PDF资料下载
参数资料
| 型号： | A4973SLBTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 4/11页 |
| 文件大小： | 0K |
| 描述： | IC PWM MOTOR DVR FULL 16SOIC |
| 特色产品： | A4973 Motor Driver |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器，PWM 电机驱动器 |
| 输出数： | 1 |
| 电流 - 输出： | 1.5A |
| 电压 - 负载： | 5 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 |
| 其它名称： | 620-1438-6 |
A4973
FUNCTIONAL DESCRIPTION
Internal PWM Current Control During Forward
and Reverse Operation. The A4973 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
2 × R S
MODE
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 and both sinks are turned on. The load inductance
causes the current to recirculate through the sink drivers. In fast
current-decay mode, the selected sink and source driver pair are
disabled, then the opposite pair is turned on. 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).
Dwg. WP-015-1
Brake Operation. During braking, care should be taken
to ensure that the motor ’s current does not exceed the ratings
of the device. The braking current can be measured by using
an oscilloscope with a current probe connected to one of the
motor ’s leads, or if the back-EMF voltage of the motor is known,
Figure 1 — Load-Current Paths
V BB
approximated by:
I PEAK BRAKE ML ≈
V BEMF
R LOAD
RC Fixed Off-Time. The internal PWM current-control
circuitry uses a one shot to control the time the driver(s)
remain(s) off. The one-shot time, t OFF (fixed off-time), is
determined by the selection of an external resistor (R T ) and
capacitor (C T ) connected in parallel from the RC timing terminal
to ground. The fixed off-time, over a range of values of C T = 470
pF to 1500 pF and R T = 12 k Ω to 100 k Ω , is approximated by:
t OFF ≈ R T x C T
R S
Drive Current (Normal)
Recirculation (Fast Decay)
Recirculation (Slow Decay)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
相关PDF资料 |
PDF描述 |
|---|---|
| A4975SB-T | IC PWM MICROSTEP DVR FULL 16DIP |
| A4979GLPTR-T | IC MOTOR DRVR MICRO STEP 28TSSOP |
| A4980KLPTR-T | IC STEPPER DVR PROGR 28-TSSOP |
| A4982SLPTR-T | IC DRIVER MICROSTEPPING 24-TSSOP |
| A4983SETTR-T | IC MOTOR DRIVER MICROSTEP 28-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A4975 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Full-Bridge PWM Microstepping Motor Driver |
| A4975SB-T | 功能描述:IC PWM MICROSTEP DVR FULL 16DIP 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 |
| A4975SLBTR-T | 功能描述:IC PWM MICROSTEP DVR FULL 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 产品变化通告:ATA683(3,4)PLQW Obsolescence 09/Aug/2012 标准包装:1 系列:- 应用:DC 电机控制器，无刷（BLDC），3 相 评估套件:可供 输出数:1 电流 - 输出:100mA 电压 - 负载:5.25 V ~ 20 V 电源电压:5.25 V ~ 20 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-VQFN（7x7） 包装:剪切带 (CT) 其它名称:ATA6833-PLQWCT |
| A4979 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A4979 is a flexible microstepping motor driver with built-in translator for easy operation. |
| A4979GLPTR-T | 功能描述:IC MOTOR DRVR MICRO STEP 28TSSOP 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:步进电机驱动器，1-2 相，2 相 评估套件:- 输出数:1 电流 - 输出:800mA 电压 - 负载:10 V ~ 28 V 电源电压:4.75 V ~ 5.25 V 工作温度:-20°C ~ 90°C 安装类型:表面贴装 封装/外壳:28-SOP + 2 翼片裸露焊盘 供应商设备封装:28-HSOPHC（15.2x7.9） 包装:剪切带 (CT) 其它名称:869-1268-1 |
发布紧急采购，3分钟左右您将得到回复。