900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






Allegro MicroSystems

A3983 Datasheet Preview

A3983 Datasheet

DMOS Microstepping Driver

No Preview Available !

A3983
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 and thermal shutdown circuitry
Crossover-current protection
Package: 24-pin TSSOP with exposed thermal pad
(suffix LP)
Not to scale
Description
The A3983 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-, and eighth-step
modes, with an output drive capacity of up to 35 V and ±2 A.
The A3983 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
A3983. 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 A3983 interface is an ideal fit for applications where a
complex microprocessor is unavailable or is overburdened.
The chopping control in the A3983 automatically selects the
current decay mode (Slow or Mixed). When a signal occurs at
the STEP input pin, the A3983 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
Continued on the next page…
Functional Block Diagram
VREG
0.22 μF
ROSC
0.1 μF
CP1 CP2
VDD
Current
Regulator
OSC
Charge
Pump
VCP
REF
DAC
STEP
DIR
RESET
MS1
MS2
Translator
ENABLE
SLEEP
DAC
PWM Latch
Blanking
Mixed Decay
Control
Logic
PWM Latch
Blanking
Mixed Decay
DMOS Full Bridge
Gate
Drive
DMOS Full Bridge
VBB1
OUT1A
OUT1B
SENSE1
VBB2
OUT2A
OUT2B
SENSE2
VREF
0.1 μF
RS1
RS2
26184.29D




Allegro MicroSystems

A3983 Datasheet Preview

A3983 Datasheet

DMOS Microstepping Driver

No Preview Available !

A3983
DMOS Microstepping Driver with Translator
Description (continued)
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 A3983 is supplied in a low-profile (1.2 mm maximum height),
24-pin TSSOP with exposed thermal pad (suffix LP). It is lead (Pb)
free, with 100% matte tin leadframe plating.
Selection Guide
Part Number
Package
A3983SLPTR-T
24-pin TSSOP with exposed thermal pad
Packing
4000 pieces per 13-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
Notes
Output current rating may be limited by duty cycle, ambient
temperature, and heat sinking. Under any set of conditions,
do not exceed the specified current rating or a junction tem-
perature of 150°C.
Range S
Rating
35
±2
–0.3 to 7
0.5
4
–20 to 85
150
–55 to 150
Units
V
A
V
V
V
ºC
ºC
ºC
THERMAL CHARACTERISTICS
Characteristic
Symbol
Package Thermal Resistance
RθJA
Test Conditions*
4-layer PCB, based on JEDEC standard)
*In still air. Additional thermal information available on Allegro Web site.
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
20
Maximum Power Dissipation, PD(max)
(R
θJA = 28 ºC/W)
40 60 80 100 120 140 160 180
Temperature (°C)
Value Units
28 ºC/W
Allegro MicroSystems, LLC
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com


Part Number A3983
Description DMOS Microstepping Driver
Maker Allegro MicroSystems
PDF Download

A3983 Datasheet PDF






Similar Datasheet

1 A3980 Automotive DMOS Microstepping Driver
Allegro MicroSystems
2 A3982 DMOS Stepper Motor Driver
Allegro
3 A3983 DMOS Microstepping Driver
Allegro MicroSystems
4 A3984 DMOS Microstepping Driver
Allegro MicroSystems
5 A3985 Digitally Programmable Dual Full-Bridge MOSFET Driver
Allegro MicroSystems
6 A3986 Dual Full-Bridge MOSFET Driver
Allegro MicroSystems
7 A3987 DMOS Microstepping Driver
Allegro MicroSystems
8 A3988 Quad DMOS Full Bridge PWM Motor Driver
Allegro MicroSystems
9 A3989 Bipolar Stepper and High Current DC Motor Driver
Allegro MicroSystems





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy