Datasheet > A4988_V4

A4988_V4

更新时间： 2022-10-08 09:30:37

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器转换器
页数	文件大小	规格书
20页	381K
描述
DMOS Microstepping Driver with Translator And Overcurrent Protection

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A4988_V4 数据手册

A4988

DMOS Microstepping Driver with Translator

And Overcurrent Protection

Features and Benefits

▪ Low R_DS(ON)outputs

Description

The A4988 is a complete microstepping motor driver with

▪ Automatic current decay mode detection/selection

▪ Mixed and Slow current decay modes

▪ Synchronous rectification for low power dissipation

▪ Internal UVLO

▪ Crossover-current protection

▪ 3.3 and 5 V compatible logic supply

▪ Thermal shutdown circuitry

built-in translator for easy operation. It is designed to operate

bipolar stepper motors in full-, half-, quarter-, eighth-, and

sixteenth-step modes, with an output drive capacity of up to

35 V and ±2 A. The A4988 includes a fixed off-time current

regulator which has the ability to operate in Slow or Mixed

decay modes.

The translator is the key to the easy implementation of the

A4988. Simply inputting one pulse on the STEP input drives

the motor one microstep. There are no phase sequence tables,

highfrequencycontrollines,orcomplexinterfacestoprogram.

The A4988 interface is an ideal fit for applications where a

complex microprocessor is unavailable or is overburdened.

▪ Short-to-ground protection

▪ Shorted load protection

▪ Five selectable step modes: full, ¹/₂, ¹/₄, ¹/₈, and ¹/₁₆

Package:

28-contact QFN

with exposed thermal pad

5 mm × 5 mm × 0.90 mm

(ET package)

During stepping operation, the chopping control in theA4988

automatically selects the current decay mode, Slow or Mixed.

In Mixed decay mode, the device is set initially to a fast decay

for a proportion of the fixed off-time, then to a slow decay for

the remainder of the off-time. Mixed decay current control

resultsinreducedaudiblemotornoise,increasedstepaccuracy,

and reduced power dissipation.

Continued on the next page…

Approximate size

Typical Application Diagram

V_DD

0.1 μF

0.22 μF

VREG ROSC CP1

VDD

CP2 VCP

VBB1

VBB2

0.22 μF

100 μF

5 kΩ

Microcontroller or

Controller Logic

SLEEP

STEP

OUT1A

A4988

OUT1B

SENSE1

MS1

MS2

MS3

OUT2A

DIR

OUT2B

ENABLE

RESET

SENSE2

GND

VREF

4988-DS, Rev. 4

12 3 4 5 6 7...20

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