SLA7042M
AND
SLA7044M
MICROSTEPPING, UNIPOLAR PWM,
HIGH-CURRENT MOTOR CONTROLLER/DRIVER
OUT A
STROBE A
REF/ENABLE A
CNTRL SPLY A
CLOCK A
SERIAL DATA A
GROUND A
OUT A
SENSE A
SENSE B
OUT B
GROUND B
STROBE B
REF/ENABLE B
CNTRL SPLY B
CLOCK B
SERIAL DATA B
OUT B
Data Sheet
28202A*
The SLA7042M and SLA7044M are designed for high-efficiency
and high-performance microstepping operation of 2-phase, unipolar
stepper motors. Microstepping provides improved resolution without
limiting step rates, and provides much smoother low-speed motor
operation. An automated, innovative packaging technology combined
with power NMOS FETs and monolithic CMOS logic/control circuitry
advances power multi-chip modules (PMCMs™) toward the complete
integration of motion control. Each half of these stepper motor control-
ler/drivers operate independently. The 4-bit shift registers are serially
loaded with motor phase information and output current-ratio data (eight
levels). The combination of user-selectable current-sensing resistor,
linearly adjustable reference voltage, and digitally selected output
current ratio provides users with a broad, variable range of of full, half,
and microstepping motor control (I
OUT
≈
[V
REF
/3 • R
S
] • Current Ratio).
Each PMCM is rated for a maximum motor supply voltage of 46 V
and utilizes advanced NMOS FETs for the high-current, high-voltage
driver outputs. The avalanche-rated (≥100 V) FETs provide excellent
ON resistance, improved body diodes, and very-fast switching. The
multi-chip ratings and performance afford significant benefits and
advantages for stepper drives when compared to the higher dissipation
and slower switching speeds associated with bipolar transistors. Highly
automated manufacturing techniques provide low-cost and exception-
ally reliable PMCMs suitable for controlling and directly driving a broad
range of 2-phase, unipolar stepper motors. The SLA7042M and
SLA7044M are identical except for r
DS(on)
and output current ratings.
Complete applications information is given on the following pages.
PWM current is regulated by appropriately choosing current-sensing
resistors, a voltage reference, and digitally programmable current ratio.
Inputs are compatible with 5 V logic and microprocessors.
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
Load Supply Voltage, V
BB
. . . . . . . . . . . .
46 V
FET Output Voltage, V
DS
. . . . . . . . . . .
100 V
Control Supply Voltage, V
DD
. . . . . . . . .
7.0 V
Peak Output Current,
I
OUTM
(t
w
≤
10
µs)
. . . . . . . . . . . . . . . .
5.0 A
Continuous Output Current, I
OUT
SLA7042M . . . . . . . . . . . . . . . . . . . . .
1.5 A
SLA7044M . . . . . . . . . . . . . . . . . . . . .
3.0 A
Input Voltage Range,
V
IN
. . . . . . . . . . . . . .
-0.3 V to V
DD
+ 0.3 V
Reference Voltage, V
REF
. . . . . . . . . . . .
V
DD
Junction Temperature, T
J
. . . . . . . . .
+150
°
C
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . . . . . . .
-20
°
C to +85
°
C
Storage Temperature Range,
T
stg
. . . . . . . . . . . . . . . . . .
-40
°
C to +150
°
C
Package Power Dissipation, P
D
.
See Graph
+
+
1
SR/LATCH
ø CONTROL/LOGIC
2
V
REF
3
4
5
6
7
8
9
10
11
12
13
V
REF
V
CC
14
15
16
17
18
V
CC
D/A
D/A
CONTROL/LOGIC
SR/LATCH
ø
Dwg. PK-008
BENEFITS AND FEATURES
s
s
s
s
s
s
s
s
s
Cost-Effective, Multi-Chip Solution
‘Turn-Key’ Motion-Control Module
Motor Operation to 3 A and 46 V
3
rd
Generation High-Voltage FETs
100 V, Avalanche-Rated NMOS
Low r
DS(on)
NMOS Outputs
Advanced, Improved Body Diodes
Microstepping Unipolar Drive
High-Efficiency, High-Speed PWM
s
Independent PWM Current Control
(2-Phase)
s
Digitally Programmable PWM
Current Control
s
Low Component-Count PWM Drive
s
Low Internal-Power Dissipation
s
Electrically Isolated Power Tab
s
Logic IC- and
µP-Compatible
Inputs
s
Machine-Insertable Package
Always order by complete part number:
SLA7042M
.
™
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
