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参数资料
| 型号： | A4950KLJTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 5/9页 |
| 文件大小： | 0K |
| 描述： | IC MOTOR DVR FULL-BRIDGE 8-SOIC |
| 标准包装： | 1 |
| 应用： | 直流电机驱动器，PWM 电机驱动器 |
| 评估套件： | * |
| 输出数： | 1 |
| 电流 - 输出： | 3.5A |
| 电压 - 负载： | 8 V ~ 40 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOICN 裸露焊盘 |
| 包装： | 标准包装 |
| 其它名称： | 620-1470-6 |
A4950
Full-Bridge DMOS PWM Motor Driver
Functional Description
I TripMAX =
Device Operation
The A4950 is designed to operate DC motors. The output drivers
are all low-R DS(on) , N-channel DMOS drivers that feature inter-
nal synchronous rectification to reduce power dissipation. The
current in the output full bridge is regulated with fixed off-time
pulse width modulated (PWM) control circuitry. The IN1 and IN2
inputs allow two-wire control for the bridge.
Protection circuitry includes internal thermal shutdown, and pro-
tection against shorted loads, or against output shorts to ground
or supply. Undervoltage lockout prevents damage by keeping the
outputs off until the driver has enough voltage to operate nor-
mally.
Standby Mode
Low Power Standby mode is activated when both input (INx)
pins are low for longer than 1 ms. Low Power Standby mode
disables most of the internal circuitry, including the charge pump
and the regulator. When the A4950 is coming out of standby
mode, the charge pump should be allowed to reach its regulated
voltage (a maximum delay of 200 μ s) before any PWM com-
mands are issued to the device.
Internal PWM Current Control
Initially, a diagonal pair of source and sink FET outputs are
enabled and current flows through the motor winding and the
optional external current sense resistor, R S . When the voltage
across R S equals the comparator trip value, then the current sense
comparator resets the PWM latch. The latch then turns off the
sink and source FETs (Mixed Decay mode).
V REF
The maximum value of current limiting is set by the selection of
R Sx and the voltage at the VREF pin. The transconductance func-
tion is approximated by the maximum value of current limiting,
I TripMAX (A), which is set by:
V REF
10 R S
where V REF is the input voltage on the VREF pin (V) and R S is
the resistance of the sense resistor ( Ω ) on the LSS terminal.
Overcurrent Protection
A current monitor will protect the IC from damage due to output
shorts. If a short is detected, the IC will latch the fault and disable
the outputs. The fault latch can only be cleared by coming out of
Low Power Standby mode or by cycling the power to VBB. Dur-
ing OCP events, Absolute Maximum Ratings may be exceeded
for a short period of time before the device latches.
Shutdown
If the die temperature increases to approximately 160°C, the full
bridge outputs will be disabled until the internal temperature falls
below a hysteresis, T TSDhys , of 15°C. Internal UVLO is present
on VBB to prevent the output drivers from turning-on below the
UVLO threshold.
Braking
The braking function is implemented by driving the device in
Slow Decay mode, which is done by applying a logic high to both
inputs, after a bridge-enable Chop command (see PWM Control
Truth Table). Because it is possible to drive current in both direc-
tions through the DMOS switches, this configuration effectively
shorts-out the motor-generated BEMF, as long as the Chop com-
mand is asserted. The maximum current can be approximated by
V BEMF / R L . Care should be taken to ensure that the maximum
ratings of the device are not exceeded in worse case braking situ-
ations: high speed and high-inertia loads.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A4952 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Designed for pulse width modulated (PWM) control of DC motors, the A4952 and A4953 are capable of peak output currents to ?±2 A and operating voltages to 40 V. |
| A4952ELYTR-T | 功能描述:IC PWM MOTOR DVR FULL 10-MSOP 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 |
| A4953 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Designed for pulse width modulated (PWM) control of DC motors, the A4952 and A4953 are capable of peak output currents to ?±2 A and operating voltages to 40 V. |
| A495302 | 功能描述:栅栏接线端子 DISCONNECT BLOCK RoHS:否 制造商:TE Connectivity / AMP 产品:Barrier Terminal Blocks 系列: 类型:Dual Barrier, Flat Block without Mounting Ears 节距:9.53 mm 位置/触点数量:2 线规量程:22-12 电流额定值:20 A 电压额定值:300 V 安装风格:Through Hole 安装角:Vertical 端接类型:Screw 触点电镀:Tin |
| A495302CW | 功能描述:栅栏接线端子 MAGNUM A4 SERIES RoHS:否 制造商:TE Connectivity / AMP 产品:Barrier Terminal Blocks 系列: 类型:Dual Barrier, Flat Block without Mounting Ears 节距:9.53 mm 位置/触点数量:2 线规量程:22-12 电流额定值:20 A 电压额定值:300 V 安装风格:Through Hole 安装角:Vertical 端接类型:Screw 触点电镀:Tin |
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