Datasheet > A3984_13

A3984_13

更新时间： 2022-05-20 03:14:59

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器
页数	文件大小	规格书
12页	344K
描述
DMOS Microstepping Driver with Translator

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A3984_13 数据手册

A3984

DMOS Microstepping Driver with Translator

Features and Benefits

▪ Low RDS(ON) outputs

Description

The A3984 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 and thermal shutdown circuitry

▪ Crossover-current protection

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

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

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

35 V and ±2 A. The A3984 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

A3984. Simply inputting one pulse on the STEP input drives

the motor one microstep. There are no phase sequence

tables, high frequency control lines, or complex interfaces to

program. The A3984 interface is an ideal fit for applications

where a complex microprocessor is unavailable or is

overburdened.

Package: 24-pin TSSOP with exposed

thermal pad (suffix LP)

The chopping control in the A3984 automatically selects

the current decay mode (Slow or Mixed). When a signal

occurs at the STEP input pin, the A3984 determines if

that step results in a higher or lower current in each of the

motor phases. If the change is to a higher current, then

the decay mode is set to Slow decay. If the change is to a

lower current, then the current decay is set to Mixed (set

Not to scale

Continued on the next page…

Pin-out Diagram

GND

CP1

CP2

ENABLE

OUT2B

VBB2

VCP

VREG

MS1

SENSE2

OUT2A

OUT1A

SENSE1

VBB1

MS2

RESET

ROSC

SLEEP

VDD

OUT1B

DIR

STEP

REF

GND

26184.30E

12 3 4 5 6 7...12

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