A4983 Microstepping Driver Datasheet

A4983 Datasheet, PDF, Equivalent


Part Number

A4983

Description

DMOS Microstepping Driver

Manufacture

Allegro MicroSystems

Total Page 16 Pages
Datasheet
Download A4983 Datasheet


A4983
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A4983
DMOS Microstepping Driver with Translator
Features and Benefits
Low RDS(ON) outputs
Automatic current decay mode detection/selection
Mixed and Slow current decay modes
Synchronous rectification for low power dissipation
Internal UVLO
Crossover-current protection
3.3 and 5 V compatible logic supply
Very thin profile QFN package
Thermal shutdown circuitry
Package: 28-pin QFN (suffix ET)
Description
The A4983 is a complete microstepping motor driver with
built-in translator for easy operation. It is designed to operate
bipolar stepper motors in full-, half-, quarter-, eighth, and
sixteenth-step modes, with an output drive capacity of up to
35 V and ±2 A. The A4983 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
A4983. Simply inputting one pulse on the STEP input drives
the motor one microstep. There are no phase sequence tables,
high frequency control lines, or complex interfaces to program.
The A4983 interface is an ideal fit for applications where a
complex microprocessor is unavailable or is overburdened.
The chopping control in the A4983 automatically selects the
current decay mode (Slow or Mixed). When a signal occurs at
the STEP input pin, the A4983 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
Approximate size
Continued on the next page…
Typical Application Diagram
Microcontroller or
Controller Logic
VDD
0.22 μF
0.1 μF
VREG VCP CP1 CP2
VDD
VBB
VBB
MS1
MS2
MS3
A4983
OUT1A
OUT1B
RS1
SLEEP
STEP
DIR
RESET
ENABLE
OUT2A
OUT2B
RS2
REF
ROSC
0.1 μF
VBB
4983DS

A4983
A4983
DMOS Microstepping Driver with Translator
Description (continued)
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 A4983 is supplied in a 5 mm × 5 mm × 0.90 nominal surface
mount QFN package with exposed thermal pad (suffix ET). The
package is lead (Pb) free (suffix –T), with 100% matte tin plated
leadframe.
Selection Guide
Part Number
A4983SET-T
A4983SETTR-T
Pb-free
Yes
Yes
Package
28-pin QFN with exposed thermal pad
28-pin QFN with exposed thermal pad
Packing
73 pieces per tube
1500 pieces per 7-in. reel
Absolute Maximum Ratings
Characteristic
Load Supply Voltage
Output Current
Logic Input Voltage
Sense Voltage
Reference Voltage
Operating Ambient Temperature
Maximum Junction
Storage Temperature
Symbol
VBB
IOUT
VIN
VSENSE
VREF
TA
TJ(max)
Tstg
Duty Cycle < 20%
Range S
Notes
Rating
35
±2
±2.5
–0.3 to 7
0.5
4
–20 to 85
150
–55 to 150
Units
V
A
A
V
V
V
ºC
ºC
ºC
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com


Features www.DataSheet4U.com A4983 DMOS Microste pping Driver with Translator Features a nd Benefits ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ ▪ Low RDS(ON) outputs Automatic current decay mode detection/selection Mixed and Slow current decay modes Sync hronous rectification for low power dis sipation Internal UVLO Crossover-curren t protection 3.3 and 5 V compatible log ic supply Very thin profile QFN package Thermal shutdown circuitry Descriptio n The A4983 is a complete microstepping motor driver with built-in translator for easy operation. It is designed to o perate bipolar stepper motors in full-, half-, quarter-, eighth, and sixteenth -step modes, with an output drive capac ity of up to 35 V and ±2 A. The A4983 includes a fixed off-time current regul ator which has the ability to operate i n Slow or Mixed decay modes. The transl ator is the key to the easy implementat ion of the A4983. Simply inputting one pulse on the STEP input drives the moto r one microstep. There are no phase sequence tables, high frequency control lines,.
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