Datasheet > A3979_08

A3979_08

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器
页数	文件大小	规格书
14页	466K
描述
Microstepping DMOS Driver with Translator

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A3979_08 数据手册

A3979

Microstepping DMOS Driver with Translator

Features and Benefits

▪ ±2.5 A, 35 V output rating

Description

The A3979 is a complete microstepping motor driver with

▪ Low R_DS(On)outputs: 0.28 Ω source, 0.22 Ω sink, typical

▪ Automatic current decay mode detection/selection

▪ 3.0 to 5.5 V logic supply voltage range

▪ Slow, Fast or Mixed current decay modes

▪ Home output

▪ Synchronous rectification for low power dissipation

▪ Internal UVLO and thermal shutdown circuitry

▪ Crossover-current protection

built-intranslator,designedasapin-compatiblereplacementfor

the successfulA3977, with enhanced microstepping ( /16 step)

precision. 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 ±2.5A. TheA3979 includes a

fixedoff-timecurrentregulatorthathastheabilitytooperatein

Slow, Fast, or Mixed decay modes. This current-decay control

scheme results in reduced audible motor noise, increased step

accuracy, and reduced power dissipation.

The translator is the key to the easy implementation of the

A3979. It allows the simple input of one pulse on the STEP

pin to drive the motor one microstep, which can be either a full

step, half, quarter, or sixteenth, depending on the setting of the

MS1andMS2logicinputs.Therearenophase-sequencetables,

high-frequencycontrollines,orcomplexinterfacestoprogram.

The A3979 interface is an ideal fit for applications where a

complex microprocessor is unavailable or is overburdened.

Package: 28 lead TSSOP (suffix LP) with

exposed thermal pad

Internalsynchronous-rectificationcontrolcircuitryisprovided

to improve power dissipation during PWM operation. Internal

circuit protection includes: thermal shutdown with hysteresis,

UVLO (undervoltage lockout), and crossover-current

protection. Special power-on sequencing is not required.

The A3979 is supplied in a low-profile (height ≤1.20 mm),

28-pin TSSOP with exposed thermal pad. The package is lead

(Pb) free, with 100% matte tin leadframe plating.

Not to scale

Pin-out Diagram

SENSE1

HOME

DIR

VBB1

SLEEP

ENABLE

OUT1B

CP2

OUT1A

PFD

PWM

Timer

Charge

Pump

RC1

CP1

Translator

and

Control

Logic

AGND

REF

VCP

÷8

PGND

VREG

STEP

OUT2B

RESET

RC2

Reg

VDD

OUT2A

MS2

MS1

SENSE2 14

VBB2

AGND and PGND must be

connected together externally

26184.23D

12 3 4 5 6 7...14

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