Datasheet > A3988_11

A3988_11

更新时间： 2024-11-24 12:51:19

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器电机
页数	文件大小	规格书
14页	333K
描述
The A3988 is a quad DMOS full-bridge driver capable of driving up to two stepper motors or four DC motors.

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A3988_11 数据手册

A3988

Quad DMOS Full Bridge PWM Motor Driver

Features and Benefits

Description

▪ 36 V output rating

▪ 4 full bridges

▪ Dual stepper motor driver

▪ High current outputs

The A3988 is a quad DMOS full-bridge driver capable of

driving up to two stepper motors or four DC motors. Each

full-bridge output is rated up to 1.2 A and 36 V. The A3988

includesfixedoff-timepulsewidthmodulation(PWM)current

▪ 3.3 and 5 V compatible logic supply

▪ Synchronous rectification

▪ Internal undervoltage lockout (UVLO)

▪ Thermal shutdown circuitry

▪ Crossover-current protection

▪ Low profile QFN package

regulators,alongwith2-bitnonlinearDACs(digital-to-analog

converters) that allow stepper motors to be controlled in full,

half, and quarter steps, and DC motors in forward, reverse, and

coast modes. The PWM current regulator uses the Allegro^®

patented mixed decay mode for reduced audible motor noise,

increased step accuracy, and reduced power dissipation.

Internalsynchronousrectificationcontrolcircuitryisprovided

to improve power dissipation during PWM operation.

Packages

Protection features include thermal shutdown with hysteresis,

undervoltagelockout(UVLO)andcrossovercurrentprotection.

Special power up sequencing is not required.

The A3988 is supplied in two packages, EV and JP, with

exposed power tabs for enhanced thermal performance. The

EV is a 6 mm x 6 mm, 36 pin QFN package with a nominal

overall package height of 0.90 mm. The JP is a 7 mm × 7 mm

48 pin LQFP. Both packages are lead (Pb) free, with 100%

matte tin leadframe plating.

Package EV, 36 pin QFN

0.90 mm nominal height

with exposed thermal pad

Approximate scale

Package JP, 48 pin LQFP

with exposed thermal pad

0.1 μF

50 V

0.1 μF

50 V

V_MOTOR32 V

0.22 μF

50 V

100 μF

50 V

PHASE1

I01

OUT1A

OUT1B

OUT2A

OUT2B

I11

PHASE2

I02

A3988

Microprocessor

Bipolar Stepper Motors

I12

OUT3A

OUT3B

OUT4A

OUT4B

PHASE3

I03

I13

PHASE4

I04

SENSE2

SENSE1

SENSE3

SENSE4

I14

R_S2

R_S1

R_S3

R_S4

VREF1

VREF2

VREF3

VREF4

VDD

V_REF

V_DD3.3 V

Figure 1. Typical application circuit

A3988DS, Rev. 9

12 3 4 5 6 7...14

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与A3988_11相关器件

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A3988SEV-T	ALLEGRO	获取价格	Quad DMOS Full Bridge PWM Motor Driver
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A3988SEVTR-T	ALLEGRO	获取价格	Quad DMOS Full Bridge PWM Motor Driver
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