Datasheet > A5977GLPTR-T

A5977GLPTR-T

更新时间： 2022-02-26 14:09:16

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
16页	622K
描述
Microstepping DMOS Driver with Translator

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A5977GLPTR-T 数据手册

A5977

Microstepping DMOS Driver with Translator

FEATURES AND BENEFITS

• ±2.8 A, 40 V output rating

DESCRIPTION

The A5977 is a complete microstepping motor driver with

built-in translator. It is designed to operate bipolar stepper

motors in full-, half-, quarter-, and eighth-step modes, with

outputdrivecapabilityof40Vand±2.8A.TheA5977includes

afixedoff-timecurrentregulatorthathastheabilitytooperatein

slow-,fast-,ormixed-decaymodes.Thiscurrent-decaycontrol

scheme results in reduced audible motor noise, increased step

accuracy, and reduced power dissipation.

• Low R_DS(on)outputs, 0.22 Ω source, 0.15 Ω sink typical

• Automatic current decay mode detection/selection

• 3 to 5.5 V logic supply voltage range

• Mixed, fast, and slow current decay modes

• Home output

• Synchronous rectification for low power dissipation

• Internal UVLO and thermal shutdown circuitry

• Crossover-current protection

• Short-to-ground protection

• Short-to-VBB protection

• Shorted load protection

The translator is the key to the easy implementation of the

A5977.SimplyinputtingonepulseontheSTEPinputdrivesthe

motor one step (two logic inputs determine if it is a full-, half-,

quarter-, or eighth-step). There are no phase sequence tables,

high-frequencycontrollines,orcomplexinterfacestoprogram.

The A5977 interface is an ideal fit for applications where a

complex microprocessor is unavailable or overburdened.

Internalsynchronousrectificationcontrolcircuitryisprovided

to improve power dissipation during PWM operation. Internal

circuit protection includes thermal shutdown with hysteresis,

undervoltage lockout (UVLO), and crossover-current

protection. Special power-up sequencing is not required.

Package: 28-lead TSSOP (suffix LP) with

exposed thermal pad

The A5977 is supplied in a thin (<1.2 mm) 28-pin TSSOP

with an exposed thermal pad (suffix LP). The package is lead

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

Not to scale

Typical Application

CP1

Logic

Supply

VDD

CP2

VCP

REF

PFD

Load

Supply

VBB1

VBB2

100 µF

HOMEn

STEP

DIR

A5977

OUT1A

OUT1B

Microcontroller

RESETn

SENSE1

SLEEPn

Controller Logic

SENSE2

ENABLEn

MS1

MS2

OUT2A

OUT2B

RC1

RC2

VREG

GND

PGND

A5977-DS, Rev. 2

12 3 4 5 6 7...16

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