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A4954

更新时间: 2024-01-18 08:24:15
品牌 Logo 应用领域
急速微 - ALLEGRO 驱动器
页数 文件大小 规格书
9页 248K
描述
Dual Full-Bridge DMOS PWM Motor Driver

A4954 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Active零件包装代码:TSSOP
包装说明:LEAD FREE, MO-153ABT, TSSOP-16针数:16
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:0.78
模拟集成电路 - 其他类型:BRUSH DC MOTOR CONTROLLERJESD-30 代码:R-PDSO-G16
JESD-609代码:e3长度:5 mm
湿度敏感等级:2功能数量:1
端子数量:16最高工作温度:85 °C
最低工作温度:-40 °C最大输出电流:2 A
封装主体材料:PLASTIC/EPOXY封装代码:HTSSOP
封装等效代码:TSSOP16,.25封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH峰值回流温度(摄氏度):260
电源:8/40 V认证状态:Not Qualified
座面最大高度:1.2 mm子类别:Motion Control Electronics
最大供电电流 (Isup):0.01 mA最大供电电压 (Vsup):40 V
最小供电电压 (Vsup):8 V表面贴装:YES
温度等级:INDUSTRIAL端子面层:Matte Tin (Sn)
端子形式:GULL WING端子节距:0.65 mm
端子位置:DUAL处于峰值回流温度下的最长时间:40
宽度:4.4 mmBase Number Matches:1

A4954 数据手册

 浏览型号A4954的Datasheet PDF文件第3页浏览型号A4954的Datasheet PDF文件第4页浏览型号A4954的Datasheet PDF文件第5页浏览型号A4954的Datasheet PDF文件第7页浏览型号A4954的Datasheet PDF文件第8页浏览型号A4954的Datasheet PDF文件第9页 
Dual Full-Bridge DMOS  
PWM Motor Driver  
A4954  
Synchronous Rectification  
Mixed Decay Operation  
When a PWM off-cycle is triggered by an internal fixed off-time  
cycle, load current will recirculate. The A4954 synchronous rec-  
tification feature turns-on the appropriate DMOSFETs during the  
current decay, and effectively shorts out the body diodes with the  
low RDS(on) driver. This significantly lowers power dissipation.  
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  
When a zero current level is detected, synchronous rectification is from fast decay to slow decay, the drivers are forced off for the  
turned off to prevent reversal of the load current.  
Crossover Delay, tCOD . 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  
+
0
See Enlargement A  
I
OUT  
Enlargement A  
Fixed Off-Time, t = 25 μs  
off  
0.50 × t  
0.50 × t  
off  
off  
ITrip  
I
OUT  
Fast Decay  
Slow Decay  
t
t
t
COD  
COD  
COD  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff  
6
Worcester, Massachusetts 01615-0036 U.S.A.  
1.508.853.5000; www.allegromicro.com  

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