A3982SLBT Allegro Micro Systems, Inc., A3982SLBT Datasheet

A3982SLBT

Manufacturer Part Number

A3982SLBT

Description

SOP-24

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A3982SLBT.pdf (10 pages)

Specifications of A3982SLBT

Date_code

07+

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

A3982SLBT

Manufacturer:

ALLEGRO/雅丽高

Quantity:

20 000

Company:

Meier Automation Equipment Co., Limited

Part Number:

A3982SLBTR-T

Manufacturer:

ALLEGRO/雅丽高

Quantity:

20 000

Current page: 1 of 10
Download datasheet (300Kb)

26184.28B

Load Supply Voltage,V

Output Current, I

Logic Input Voltage, V

Sense Voltage, V

Reference Voltage, V

Operating Temperature Range

Storage Temperature, T

ambient temperature, and heat sinking. Under any

set of conditions, do not exceed the specified current

rating or a junction temperature of 150°C.

Output current rating may be limited by duty cycle,

SENSE2

ENABLE

OUT2A

OUT2B

PGND

VREG

VBB2

Ambient, T

Junction Temperature, T

AB SO LUTE MAX I MUM RAT INGS

VCP

MS1

CP1

CP2

Approximate Scale 1:1

................................. –20°C to 85°C

SENSE

OUT

Package LB

......................................... ±2 A

REF

.......................................0.5 V

.................... –55°C to 150°C

………..........................4 V

..................... –0.3 V to 7 V

...................................35 V

J(MAX)

..................... 150°C

DMOS Stepper Motor Driver with Translator

OUT1A

SENSE1

VBB1

OUT1B

DIR

PGND

REF

STEP

VDD

ROSC

RESET

A3982

The A3982 is a complete stepper motor driver with built-in translator

for easy operation. It is designed to operate bipolar stepper motors in

full- and half-step modes, with an output drive capacity of up to 35 V

and ±2 A. The A3982 includes a fixed off-time current regulator which

has the ability to operate in Slow or Mixed decay modes.

The translator is the key to the easy implementation of the A3982.

Simply inputting one pulse on the STEP input drives the motor one

step. There are no phase sequence tables, high frequency control lines,

or complex interfaces to program. The A3982 interface is an ideal fit

for applications where a complex microprocessor is unavailable or is

overburdened.

The chopping control in the A3982 automatically selects the current

decay mode (Slow or Mixed). When a signal occurs at the STEP input

pin, the A3982 determines if that step results in a higher or lower

current in each of the motor phases. If the change is to a higher current,

then the decay mode is set to Slow decay. If the change is to a lower

current, then the current decay is set to Mixed (set initially to a fast

decay for a period amounting to 31.25% of the fixed off-time, then

to a slow decay for the remainder of the off-time). This current decay

control scheme results in reduced audible motor noise, increased step

accuracy, and reduced power dissipation.

Internal synchronous rectification control circuitry is provided to

improve power dissipation during PWM operation.

Internal circuit protection includes: thermal shutdown with hysteresis,

undervoltage lockout (UVLO), and crossover-current protection.

Special power-on sequencing is not required.

The A3982 is supplied in a 24-pin wide-body SOIC (package LB) with

internally-fused power ground leads. It is also available in a lead (Pb)

free version (suffix –T), with 100% matte tin plated leadframes.

FEATURES

Use the following complete part number when ordering:

Part Number

A3982SLB-T

A3982SLB

Low R

Automatic current decay mode detection/selection

Mixed and Slow current decay modes

Synchronous rectification for low power dissipation

Internal UVLO and thermal shutdown circuitry

Crossover-current protection

DS(ON)

outputs

Pb-free

Yes

–

24-pin, Wide SOIC

Package

–20°C to 85°C

Ambient

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