A4975SB-T Allegro Micro Systems, Inc., A4975SB-T Datasheet

A4975SB-T

Manufacturer Part Number

A4975SB-T

Description

DIP 16/Full-Bridge PWM Microstepping Motor Driver

Manufacturer

Allegro Micro Systems, Inc.

Datasheets

1.A4975SLBTR-T.pdf (13 pages)

2.A4975.pdf (13 pages)

Specifications of A4975SB-T

Pack_quantity

Comm_code

85423990

Lead_time

168

Current page: 1 of 13
Download datasheet (317Kb)

Package B, 16-pin DIP

with exposed tabs

Features and Benefits

▪ ±1.5 A continuous output current

▪ 50 V output voltage rating

▪ Internal PWM current control

▪ 3-bit nonlinear DAC

▪ Fast, mixed fast/slow, and slow current-decay modes

▪ Internal thermal shutdown circuitry

▪ Crossover-current and UVLO protection

Packages:

4975-DS

Not to scale

PFD

GROUND

PHASE

Preliminary Datasheet

Full-Bridge PWM Microstepping Motor Driver

COMPARATOR

MIXED-DECAY

Package LB, 16-pin SOIC

with internally fused pins

–

BLANKING

UVLO

& TSD

Functional Block Diagram

R T

PWM LATCH

C T

Subject to Change Without Notice March 8, 2011

BLANKING

GATE

+ –

Description

The A4975 is designed to drive one winding of a bipolar

stepper motor in a microstepping mode. The outputs are

rated for continuous output currents to ±1.5 A and operating

voltages to 50 V. Internal pulse width modulated (PWM) current

control combined with an internal three-bit nonlinear digital-

to-analog converter allows the motor current to be controlled

in full-, half-, quarter-, or eighth-step (microstepping) modes.

Nonlinear increments minimize the number of control lines

necessary for microstepping. Microstepping provides increased

step resolution, and reduces torque variations and resonance

problems at low speed.

Internal circuitry determines whether the PWM current-control

circuitry operates in a slow (recirculating) current-decay

mode, fast (regenerative) current-decay mode, or in a mixed

current-decay mode in which the off-time is divided into a

period of fast current decay and with the remainder of the

fixed off-time spent in slow current decay. The combination of

user-selectable current-sensing resistor and reference voltage,

digitally selected output current ratio; and slow, fast, or mixed

current-decay modes provides users with a broad, variable

range of motor control.

Continued on the next page…

V TH

CURRENT-SENSE

COMPARATOR

D/A

–

DISABLE

SENSE

R S

A4975

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