ALLEGRO A3983 User Manual
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DMOS Microstepping Driver with Translator
Package LP
CP1
1
CP2
2
Pump
VCP
VREG
MS1
MS2
RESET
ROSC
SLEEP
VDD
STEP
REF
Charge
3
4
Reg
5
6
7
OSC
Translator
& Control Logic
8
9
10
11
12
Approximate Scale 1:1
AB SO LUTE MAX I MUM RAT INGS
Load Supply Voltage,V
Output Current, I
OUT
Logic Input Voltage, V
Sense Voltage, V
SENSE
Reference Voltage, V
Operating Temperature Range
Ambient, T
................................. –20°C to 85°C
A
Junction Temperature, T
Storage Temperature, T
*
Output current rating may be limited by duty cycle,
...................................35 V
BB
......................................... ±2 A
..................... –0.3 V to 7 V
IN
.......................................0.5 V
………..........................4 V
REF
.....................150°C
J(MAX)
.................... –55°C to 150°C
S
ambient temperature, and heat sinking. Under any
set of conditions, do not exceed the specified current
rating or a junction temperature of 150°C.
24
23
22
21
20
19
18
17
16
15
14
13
GND
ENABLE
OUT2B
VBB2
SENSE2
OUT2A
OUT1A
SENSE1
VBB1
OUT1B
DIR
GND
A3983
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 offtime 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
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), 24-pin
*
TSSOP with exposed thermal pad (package LP). It is also available
in a lead (Pb) free version (suffix –T), with 100% matte tin plated
leadframes.
FEATURES
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
Use the following complete part number when ordering:
Part Number Pb-free Package Description
A3983SLP –
A3983SLP-T Yes
DS(ON)
outputs
24-pin, TSSOP Exposed thermal pad
26184.29A
DMOS Microstepping Driver with Translator
Functional Block Diagram
0.22 μF
A3983
0.1 μF
VDD
REF
STEP
DIR
RESET
MS1
MS2
ENABLE
SLEEP
DAC
Translator
VREG
Current
Regulator
PWM Latch
Blanking
Mixed Decay
Control
Logic
PWM Latch
Blanking
Mixed Decay
OSC
ROSC
Gate
Drive
DMOS Full Bridge
DMOS Full Bridge
CP1
Charge
Pump
CP2
VCP
VBB1
OUT1A
OUT1B
SENSE1
VBB2
OUT2A
OUT2B
SENSE2
0.1 μF
R
S1
R
S2
26184.29A
DAC
V
REF
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
2
A3983
DMOS Microstepping Driver with Translator
ELECTRICAL CHARACTERISTICS1 at T
Characteristics Symbol Test Conditions Min.
= 25°C, V
A
= 35 V (unless otherwise noted)
BB
Typ.
2
Max. Units
Output Drivers
Load Supply Voltage Range V
Logic Supply Voltage Range V
Output On Resistance R
Body Diode Forward Voltage V
Motor Supply Current I
BB
DD
DSON
F
BB
Operating 8 – 35 V
During Sleep Mode 0 – 35 V
Operating 3.0 – 5.5 V
Source Driver, I
Sink Driver, I
= –1.5 A – 0.350 0.450 Ω
OUT
= 1.5 A – 0.300 0.370 Ω
OUT
Source Diode, IF = –1.5 A – – 1.2 V
Sink Diode, I
f
< 50 kHz – – 4 mA
PWM
= 1.5 A – – 1.2 V
F
Operating, outputs disabled – – 2 mA
Sleep Mode – – 10 μA
f
< 50 kHz – – 8 mA
PWM
Logic Supply Current I
DD
Outputs off – – 5 mA
Sleep Mode – – 10 μA
Control Logic
Logic Input Voltage
Logic Input Current
V
V
I
I
IN(1)
IN(0)
IN(1)
IN(0)
VIN = V
V
= V
IN
DD
DD
×0.7
×0.3
V
×0.7
DD
––
–20 <1.0 20 μA
–20 <1.0 20 μA
––V
V
×0.3
DD
Microstep Select 2 MS2 – 100 – kΩ
Input Hysteresis V
Blank Time
t
Fixed Off-Time
Reference Input Voltage Range V
Reference Input Current I
Current Trip-Level Error
3
Crossover Dead Time t
HYS(IN)
BLANK
t
OFF
REF
REF
err
I
DT
OSC > 3 V 20 30 40 μs
R
= 25 kΩ 23 30 37 μs
OSC
V
REF
V
REF
V
REF
= 2 V, %I
= 2 V, %I
= 2 V, %I
= 38.27% – – ±15 %
TripMAX
= 70.71% – – ±5 %
TripMAX
= 100.00% – – ±5 %
TripMAX
150 300 500 mV
0.7 1 1.3 μs
0–4V
–3 0 3 μA
100 475 800 ns
Protection
Thermal Shutdown Temperature T
Thermal Shutdown Hysteresis T
UVLO Enable Threshold UV
UVLO Hysteresis UV
J
JHYS
LO
HYS
VDD rising 2.35 2.7 3 V
– 165 – °C
–15–°C
0.05 0.10 – V
V
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
errI = (I
Trip – IProg
26184.29A
) ⁄ I
Prog
, where I
Prog
= %I
TripMAX
×
I
TripMAX
.
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
3
A3983
DMOS Microstepping Driver with Translator
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic Symbol Test Conditions* Value Units
One-layer PCB, one-sided with copper limited to solder pads 100 ºC/W
One layer PCB, two-sided with copper limited to solder pads and
Package Thermal Resistance
R
θJA
2
3.8 in.
of copper area on each side, connected to GND pins
High-K PCB (multilayer with significant copper areas, based on
JEDEC standard)
*In still air. Additional thermal information available on Allegro Web site.
32 ºC/W
28 ºC/W
Maximum Power Dissipation, P
5.5
5.0
4.5
(W)
D
Power Diss ipation, P
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
High-K PCB
(R
θJA
= 28
Low-K PCB
(R
θJA
= 32 ºC/W)
Minimum-K PCB
(R
θ
JA
= 100 ºC/W)
ºC/W)
20 40 60 80 100 120 140 160 180
Temperature (°C)
D(max)
26184.29A
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
4
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