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参数资料
| 型号： | APEK4954ELP-01-T-DK |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 6/9页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL MOTOR CONTROL A4954 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电机控制 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | A4954 |
| 已供物品： | 板 |
| 相关产品： | 620-1384-1-ND - IC PWM MOTOR DVR DUAL 16-ETSSOP 620-1384-6-ND - IC PWM MOTOR DVR DUAL 16-ETSSOP 620-1384-2-ND - IC PWM MOTOR DVR DUAL 16-ETSSOP |
| 其它名称： | 620-1427 |
A4954
Synchronous Rectification
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 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.
Dual Full-Bridge DMOS
PWM Motor Driver
Mixed Decay Operation
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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| APEK4957SES-01-T-DK | 功能描述:A4957 - Power Management, H-Bridge Driver (External FET) Evaluation Board 制造商:allegro microsystems, llc 系列:- 零件状态:有效 主要用途:电源管理，H 桥驱动器（外部 FET） 嵌入式:- 使用的 IC/零件:A4957 主要属性:- 辅助属性:- 所含物品:板 标准包装:1 |
| APEK4960KJP-01-T-DK | 功能描述:A4960 - Power Management, Motor Control Evaluation Board 制造商:allegro microsystems, llc 系列:- 零件状态:有效 主要用途:电源管理，电机控制 嵌入式:- 使用的 IC/零件:A4960 主要属性:3 个半 H 桥驱动器 辅助属性:- 所含物品:板 标准包装:1 |
| APEK4962KLP-01-T-DK | 功能描述:A4962 - Power Management, Motor Control Evaluation Board 制造商:allegro microsystems, llc 系列:- 零件状态:有效 主要用途:电源管理，电机控制 嵌入式:- 使用的 IC/零件:A4962 主要属性:- 辅助属性:- 所含物品:板 标准包装:1 |
| APEK4963GLP-01-T-DK | 功能描述:A4963 - Power Management, Motor Control Evaluation Board 制造商:allegro microsystems, llc 系列:- 零件状态:有效 主要用途:电源管理，电机控制 嵌入式:- 使用的 IC/零件:A4963 主要属性:无刷直流（BLDC） 电机 辅助属性:- 所含物品:板 标准包装:1 |
| APEK4979GLP-01-T-DK | 功能描述:BOARD EVAL MOTOR CONTROL A4979 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PSoC® 主要目的:电源管理，热管理 嵌入式:- 已用 IC / 零件:- 主要属性:- 次要属性:- 已供物品:板，CD，电源 |
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