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| 型号： | APEK4984SLP-01-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 10/22页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL MOTOR CONTROL A4984 |
| 标准包装： | 1 |
| 主要目的： | 电源管理，电机控制，步进控制器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | A4984 |
| 已供物品： | 板 |
| 相关产品： | 620-1341-2-ND - IC STEPPER MOTOR DRIVER 24TSSOP |
| 其它名称： | 620-1377 |
A4984
DMOS Microstepping Driver with Translator
And Overcurrent Protection
specifications.
Enable Input ( ˉEˉ ˉNˉ ˉAˉ ˉBˉ ˉLˉ ˉEˉ ) . This input turns on or off all of the
FET outputs. When set to a logic high, the outputs are disabled.
When set to a logic low, the internal control enables the outputs
as required. The translator inputs STEP, DIR, and MSx, as well as
the internal sequencing logic, all remain active, independent of the
ˉEˉ ˉNˉ ˉAˉ ˉBˉ ˉLˉ ˉEˉ input state.
Shutdown. In the event of a fault, overtemperature (excess T J )
5 A / div.
Fault
latched
or an undervoltage (on VCP), the FET outputs of the A4984 are
disabled until the fault condition is removed. At power-on, the
UVLO (undervoltage lockout) circuit disables the FET outputs
and resets the translator to the Home state.
Sleep Mode ( ˉSˉ ˉLˉ ˉEˉ ˉEˉ ˉPˉ ). To minimize power consumption
when the motor is not in use, this input disables much of the
internal circuitry including the output FETs, current regulator,
and charge pump. A logic low on the Sˉ ˉLˉ ˉEˉ ˉEˉ ˉP pin puts the A4984
into Sleep mode. A logic high allows normal operation, as well as
start-up (at which time the A4984 drives the motor to the Home
microstep position). When emerging from Sleep mode, in order
to allow the charge pump to stabilize, provide a delay of 1 ms
before issuing a Step command.
Mixed Decay Operation. The bridge can operate in Mixed
Decay mode, depending on the step sequence, as shown in fig-
ures 8 through 11. As the trip point is reached, the A4984 initially
goes into a fast decay mode for 31.25% of the off-time, t OFF .
After that, it switches to Slow Decay mode for the remainder of
t OFF . A timing diagram for this feature appears in figure 7.
Synchronous Rectification . When a PWM-off cycle is
triggered by an internal fixed-off time cycle, load current recircu-
lates according to the decay mode selected by the control logic.
This synchronous rectification feature turns on the appropriate
FETs during current decay, and effectively shorts out the body
diodes with the low FET R DS(ON) . This reduces power dissipation
significantly, and can eliminate the need for external Schottky
diodes in many applications. Synchronous rectification turns off
when the load current approaches zero (0 A), preventing reversal
of the load current.
t →
Figure 4. Short-to-ground event
5 A / div.
Fixed off-time
t →
Figure 5. Shorted load (OUTxA → OUTxB) in
Slow decay mode
5 A / div.
Fixed off-time
Fast decay portion
(direction change)
t →
Figure 6. Shorted load (OUTxA → OUTxB) in
Mixed decay mode
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
10
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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| APEK4984SLP-01-T-DK | 功能描述:A4984 - Power Management, Motor Control, Stepper 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，步进控制器 嵌入式:否 使用的 IC/零件:A4984 主要属性:- 辅助属性:- 所含物品:板 标准包装:1 |
| APEK4985SLP-01-T | 功能描述:Board Eval Motor Control A4985 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 |
| APEK4985SLP-01-T-DK | 功能描述:A4985 - Power Management, Motor Control, Stepper 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，步进控制器 嵌入式:否 使用的 IC/零件:A4985 主要属性:- 辅助属性:- 所含物品:板 标准包装:1 |
| APEK4986SLP-01-T | 功能描述:Board Eval Motor Control A4986 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 |
| APEK4986SLP-01-T-DK | 功能描述:A4986 - Power Management, Motor Control, Stepper 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，步进控制器 嵌入式:否 使用的 IC/零件:A4986 主要属性:- 辅助属性:- 所含物品:板 标准包装:1 |
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