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参数资料
| 型号： | A4950KLJTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 6/9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
Synchronous Rectification
Full-Bridge DMOS PWM Motor Driver
Mixed Decay Operation
When a PWM off-cycle is triggered by an internal fixed off-time
cycle, load current will recirculate. The A4950 synchronous rec-
tification feature turns-on the appropriate DMOSFETs during the
current decay, and effectively shorts out the body diodes with the
low R DS(on) driver. This significantly lowers power dissipation.
When a zero current level is detected, synchronous rectification is
turned off to prevent reversal of the load current.
The bridges operate in Mixed Decay mode. Referring to the
lower panel of the figure below, as the trip point is reached, the
device goes into fast decay mode for 50% of the fixed off-time
period. After this fast decay portion the device switches to slow
decay mode for the remainder of the off-time. During transitions
from fast decay to slow decay, the drivers are forced off for the
Crossover Delay, t COD . This feature is added to prevent shoot-
through in the bridge. During this “dead time” portion, synchro-
nous rectification is not active, and the device operates in fast
decay and slow decay only.
Mixed Decay Mode Operation
V PHASE
+
I OUT
0
–
Enlargement A
Fixed Off-Time, t off = 25 μ s
See Enlargement A
I Trip
0.50 × t off
I OUT
Fast Decay
0.50 × t off
Slow Decay
t COD
t COD
t COD
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
6
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相关代理商/技术参数 |
参数描述 |
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| 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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