Datasheet > A4979

A4979

更新时间： 2022-06-05 13:05:00

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器转换器电机
页数	文件大小	规格书
44页	987K
描述
The A4979 is a flexible microstepping motor driver with built-in translator for easy operation.

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A4979 数据手册

A4979

Microstepping Programmable Stepper Motor Driver

With Stall Detect and Short Circuit Protection

Description

Features and Benefits

The A4979 is a flexible microstepping motor driver with

built-intranslatorforeasyoperation.Itisasingle-chipsolution,

designed to operate bipolar stepper motors in full-, half-,

quarter- and sixteenth-step modes, at up to 50Vand 1.5A. The

A4979 can be controlled by simple Step and Direction inputs,

or through the SPI-compatible serial interface that also can be

used to program many of the integrated features and to read

diagnostic information.

• Typical application up to 1.5 A, 50 V

• Stall detect features

• Low R_DS(on)outputs, 0.5 Ω source and sink, typical

• Automatic current decay mode detection/selection

• Mixed, Fast, and Slow current decay modes

• Synchronous rectification for low power dissipation

• Internal UVLO and Thermal Shutdown circuitry

• Crossover-current protection

• Short circuit and open load diagnostics

• Hot and cold thermal warning

• SPI-compatible or simple Step and Direction motion control

• Highly configurable via SPI-compatible serial interface

The current regulator can be programmed to operate in fixed

off-time or fixed frequency PWM, with several decay modes

to reduce audible motor noise and increase step accuracy.

In addition the phase current tables can be programmed via

the serial interface to create unique microstep current

profiles to further improve motor performance for

specific applications.

Applications

• Industrial stepper motor drives

• Printers

The current in each phase of the motor is controlled through a

DMOS full bridge, using synchronous rectification to improve

power dissipation. Internal circuits and timers prevent cross-

conduction and shoot-through, when switching between high-

side and low-side drives.

• Textile machines

Package: 28-pin TSSOP with exposed

thermal pad (suffix LP)

The outputs are protected from short circuits, and features

for low load current and stalled rotor detection are included.

Chip-levelprotectionincludes:hotandcoldthermalwarnings,

overtemperature shutdown, and undervoltage lockout.

TheA4979 is supplied in a 28-pin TSSOPpower package with

an exposed thermal pad (package type LP). This package is

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

Not to scale

Typical Applications

Logic

Supply

Logic

Supply

VBB

CP1 CP2

VDD

STEP

DIR

MS0

MS1

ENABLE

RESETn

DIAG

CP1 CP2

VDD

STEP

DIR

MS0

MS1

ENABLE

RESETn

DIAG

VCP VBB

OAP

VCPVBB

OAP

OAM

Micro-

controller

Micro-

controller

Stepper

Motor

Stepper

Motor

A4979

OBP

A4979

OBP

REF

SDI

ECU

SDO

SCK

STRn

SDO

SCK

STRn

OBM

VREG

SENSA

SENSB

SENSA

SENSB

OSC

AGND PGND

Serial Interface Control

Parallel Control

A4979-DS, Rev. 1

12 3 4 5 6 7...44

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与A4979相关器件

型号	品牌	描述	获取价格	数据表
A4980	ALLEGRO	The A4980 is a flexible microstepping motor driver with built-in translator for easy opera	获取价格
A4980KLP-T	ALLEGRO	The A4980 is a flexible microstepping motor driver with built-in translator for easy opera	获取价格
A4980KLPTR-T	ALLEGRO	The A4980 is a flexible microstepping motor driver with built-in translator for easy opera	获取价格
A4982	ALLEGRO	DMOS Microstepping Driver with Translator and Overcurrent Protection	获取价格
A4982_V4	ALLEGRO	DMOS Microstepping Driver with Translator And Overcurrent Protection	获取价格
A4982SET-T	ALLEGRO	BIPOLAR STEPPING MOTOR DRIVER IC	获取价格

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