A3989

更新时间： 2024-11-24 03:16:35

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	1097K
描述
Bipolar Stepper and High Current DC Motor Driver

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A3989 数据手册

A3989

Bipolar Stepper and High Current DC Motor Driver

Features and Benefits

▪ꢀ 36ꢀVꢀoutputꢀrating

Description

The A3989 is designed operate at voltages up to 36 V while driving

one bipolar stepper motor, at currents up to 1.2A, and one dc motor,

at currents up to 2.4 A. The A3989 includes a fixed off-time pulse

width modulation (PWM) regulator for current control. The stepper

motor driver features dual 2-bit nonlinear DACs (digital-to-analog

converters) that enable control in full, half, and quarter steps. The

dc motor is controlled using standard PHASE and ENABLE signals.

Fast or slow current decay is selected via the MODE pin. The PWM

current regulator uses the Allegro^®patented mixed decay mode for

reduced audible motor noise, increased step accuracy, and reduced

power dissipation.

▪ꢀ 2.4ꢀAꢀdcꢀmotorꢀdriver

▪ꢀ 1.2ꢀAꢀbipolarꢀstepperꢀdriver

▪ꢀ Synchronousꢀrectification

▪ꢀ Internalꢀundervoltageꢀlockoutꢀ(UVLO)

▪ꢀ Thermalꢀshutdownꢀcircuitry

▪ꢀ Crossover-currentꢀprotection

▪ꢀ VeryꢀthinꢀprofileꢀQFNꢀpackage

Internal synchronous rectification control circuitry is provided to

improve power dissipation during PWM operation.

Package: 36 pin QFN with exposed thermal pad

0.90 mm nominal height (suffix EV)

Protection features include thermal shutdown with hysteresis,

undervoltage lockout (UVLO) and crossover current protection.

Special power up sequencing is not required.

The A3989 is supplied in a leadless 6 mm × 6 mm × 0.9 mm,

36 pin QFN package with exposed power tab for enhanced thermal

performance. The package is lead (Pb) free, with 100% matte tin

leadframe plating.

Approximate scale 1:1

0.1 µF

50 V

0.1 µF

50 V

100 µF

50 V

0.22 µF

50 V

CP1 CP2 VCP VBB VBB

VDD

OUT1A

OUT1B

SENSE1

PHASE1

I01

A3989

I11

OUT2A

Microcontroller or

Controller Logic

PHASE2

I02

OUT2B

SENSE2

I12

PHASE3

ENABLE

MODE

VREF1

VREF2

VREF3

OUT3A

OUT3B

SENSE3

GND GND

Figure 1. Typical application circuit

A3989DS

12 3 4 5 6 7...12

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与A3989相关器件

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A3989_V	ALLEGRO	获取价格	Bipolar Stepper and High Current DC Motor Driver
A3989SEV-T	ALLEGRO	获取价格	Bipolar Stepper and High Current DC Motor Driver
A3989SEVTR-T	ALLEGRO	获取价格	Bipolar Stepper and High Current DC Motor Driver
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