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A3983SLPTR-T

P1-P3P4-P6P7-P9P10-P12P13-P13
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
26184.29D
Features and Benefits
▪ Low R
DS(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
DMOS Microstepping Driver with Translator
Continued on the next page…
Package: 24-pin TSSOP with exposed thermal pad
(suffix LP)
Functional Block Diagram
A3983
Not to scale
SENSE1
SENSE2
VREG
VCP
CP2
Control
Logic
DAC
VDD
PWM Latch
Blanking
Mixed Decay
DAC
STEP
DIR
RESET
MS1
PWM Latch
Blanking
Mixed Decay
Current
Regulator
CP1
Charge
Pump
R
S2
R
S1
VBB1
OUT1A
OUT1B
VBB2
OUT2A
OUT2B
0.1 μF
V
REF
Translator
Gate
Drive
DMOS Full Bridge
DMOS Full Bridge
0.1 μF
0.22 μF
OSC
ROSC
MS2
REF
ENABLE
SLEEP
DMOS Microstepping Driver with Translator
A3983
2
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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.
Description (continued)
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Load Supply Voltage V
BB
35 V
Output Current I
OUT
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.
±2 A
Logic Input Voltage V
IN
–0.3 to 7 V
Sense Voltage V
SENSE
0.5 V
Reference Voltage V
REF
4V
Operating Ambient Temperature T
A
Range S –20 to 85 ºC
Maximum Junction T
J
(max) 150 ºC
Storage Temperature T
stg
–55 to 150 ºC
Selection Guide
Part Number Package Packing
A3983SLPTR-T 24-pin TSSOP with exposed thermal pad 4000 pieces per 13-in. reel
THERMAL CHARACTERISTICS
Characteristic Symbol Test Conditions* Value Units
Package Thermal Resistance
R
θJA
4-layer PCB, based on JEDEC standard) 28 ºC/W
*In still air. Additional thermal information available on Allegro Web site.
20 40 60 80 100 120 140 160 180
Temperature (°C)
Power Dissipation, P
D
(W)
0.0
0.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1.0
1.5
Maximum Power Dissipation, P
D
(max)
(R
θJA
= 28 ºC/W)
DMOS Microstepping Driver with Translator
A3983
3
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ELECTRICAL CHARACTERISTICS
1
at T
A
= 25°C, V
BB
= 35 V (unless otherwise noted)
1
Negative current is defined as coming out of (sourcing from) the specified device pin.
2
Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions. Performance may vary for
individual units, within the specified maximum and minimum limits.
3
err
I
= (I
Trip
–
I
Prog
) ⁄ I
Prog
, where I
Prog
= %I
TripMAX
I
TripMAX
.
Characteristics Symbol Test Conditions Min.
Typ.
2
Max. Units
Output Drivers
Load Supply Voltage Range V
BB
Operating 8 – 35 V
During Sleep Mode 0 – 35 V
Logic Supply Voltage Range V
DD
Operating 3.0 – 5.5 V
Output On Resistance R
DSON
Source Driver, I
OUT
= –1.5 A – 0.350 0.450
Sink Driver, I
OUT
= 1.5 A – 0.300 0.370
Body Diode Forward Voltage V
F
Source Diode, I
F
= –1.5 A – – 1.2 V
Sink Diode, I
F
= 1.5 A – – 1.2 V
Motor Supply Current I
BB
f
PWM
< 50 kHz – – 4 mA
Operating, outputs disabled – – 2 mA
Sleep Mode – – 10 A
Logic Supply Current I
DD
f
PWM
< 50 kHz – – 8 mA
Outputs off – – 5 mA
Sleep Mode – – 10 A
Control Logic
Logic Input Voltage
V
IN(1)
V
DD
0.7
––V
V
IN(0)
––
V
DD
0.3
V
Logic Input Current
I
IN(1)
V
IN
= V
DD
0.7
–20 <1.0 20 A
I
IN(0)
V
IN
=
V
DD
0.3
–20 <1.0 20 A
Microstep Select 2 MS2 – 100 – k
Input Hysteresis V
HYS(IN)
150 300 500 mV
Blank Time
t
BLANK
0.7 1 1.3 s
Fixed Off-Time
t
OFF
OSC > 3 V 20 30 40 s
R
OSC
= 25 k 23 30 37 s
Reference Input Voltage Range V
REF
0–4V
Reference Input Current I
REF
–3 0 3 A
Current Trip-Level Error
3
err
I
V
REF
= 2 V, %I
TripMAX
= 38.27% – – ±15 %
V
REF
= 2 V, %I
TripMAX
= 70.71% – – ±5 %
V
REF
= 2 V, %I
TripMAX
= 100.00% – – ±5 %
Crossover Dead Time t
DT
100 475 800 ns
Protection
Thermal Shutdown Temperature T
J
– 165 – °C
Thermal Shutdown Hysteresis T
JHYS
–15–°C
UVLO Enable Threshold UV
LO
V
DD
rising 2.35 2.7 3 V
UVLO Hysteresis UV
HYS
0.05 0.10 – V
P1-P3P4-P6P7-P9P10-P12P13-P13

A3983SLPTR-T

Mfr. #:
Buy A3983SLPTR-T
Manufacturer:
Description:
DMOS Stepper Motor Driver 24-Pin TSSOP EP T/R
Lifecycle:
New from this manufacturer.
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