Allegro MicroSystems Inc SLA7042M, SLA7044M Datasheet

HIGH-CURRENT MOTOR CONTROLLER/DRIVER

1

OUT

A

CLOCK

OUT

SENSE

SENSE

OUT

CLOCK

OUT

2

A

3

A

4

A

5

A

6

A

7

A

8

A

9

A

10

B

11 12

B
B

13

B

14

B

15

B

16

B

17

B

18

B

STROBE

REF/ENABLE
CNTRL SPLY

SERIAL DATA

GROUND

GROUND

STROBE

REF/ENABLE

CNTRL SPLY

SERIAL DATA

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, VBB. . . . . . . . . . . . 46 V

FET Output Voltage, V
Control Supply Voltage, V
Peak Output Current,

I

(t

≤ 10 µs). . . . . . . . . . . . . . . . 5.0 A

OUTM

Continuous Output Current, I

SLA7042M . . . . . . . . . . . . . . . . . . . . . 1.5 A

SLA7044M . . . . . . . . . . . . . . . . . . . . . 3.0 A

Input Voltage Range,

V

IN

Reference Voltage, V
Package Power Dissipation, PD. See Graph
Junction Temperature, T
Operating Temperature Range,

T

A

Storage Temperature Range,

T

stg

w

. . . . . . . . . . . . . . -0.3 V to VDD + 0.3 V

. . . . . . . . . . . . . . . . . . . . -20°C to +85°C

. . . . . . . . . . . . . . . . . . -40°C to +150°C

at T

SR/LATCH

V

REF

V

CC

V

REF

V

CC

SR/LATCH

= +25°C

A

DS

REF

ø

CONTROL/LOGIC

D/A

+

+

CONTROL/LOGIC

D/A

ø

. . . . . . . . . . . 100 V

. . . . . . . . . 7.0 V

DD

OUT

. . . . . . . . . . . . V

. . . . . . . . . +150°C

J

Dwg. PK-008

DD

SLA7042M

AND

SLA7044M

MICROSTEPPING, UNIPOLAR PWM,

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 control­ler/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

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 exception­ally 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

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.

BENEFITS AND FEATURES

■ Cost-Effective, Multi-Chip Solution

■ ‘Turn-Key’ Motion-Control Module

■ Motor Operation to 3 A and 46 V

■ 3rd Generation High-Voltage FETs

■ 100 V, Avalanche-Rated NMOS

■ Low r

■ Advanced, Improved Body Diodes

■ Microstepping Unipolar Drive

■ High-Efficiency, High-Speed PWM

Always order by complete part number: SLA7042M .

NMOS Outputs

DS(on)

OUT

r

DS(on)

≈ [V

/3 • RS] • Current Ratio).

REF

and output current ratings.

■ Independent PWM Current Control
(2-Phase)

■ Digitally Programmable PWM
Current Control

■ Low Component-Count PWM Drive

■ Low Internal-Power Dissipation

■ Electrically Isolated Power Tab

■ Logic IC- and µP-Compatible

Inputs

■ Machine-Insertable Package

Data Sheet

28202A*

™

SLA7042M

2

5

0

8

7

AND

SLA7044M

MICROSTEPPING,
UNIPOLAR PWM, HIGH-CURRENT
MOTOR CONTROLLER/DRIVERS

FUNCTIONAL BLOCK DIAGRAM

REF/ENABLE

STROBE

DATA

CLOCK

CONTROL

SUPPLY

4 8

1

V

DD

143

+

V – 1

DD

V

REF

132

1

6

165

CHANNEL A PIN NUMBERS
CHANNEL B PIN NUMBERS

D/A

LATCHES

SHIFT REG

ENABLE

+

NOISE FILTER

PWM OFF TIMER

PROGRAMMABLE

PHASE

1

7

GROUND

OUT

OUT

A/B

1

11

A/B

1

1

9

SENSE

Dwg. FK-006

Note that channels A and B are electrically isolated.

ALLOWABLE PACKAGE

POWER DISSIPATION

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1995, 1998 Allegro MicroSystems, Inc.

25

20

R = 5.0°C/W

θJM

15

10

5

R = 28°C/W

θJA

0

25

ALLOWABLE PACKAGE POWER DISSIPATION in WATTS

50 75 100 125 150

TEMPERATURE in °C

Dwg. GK-018-1

™

SLA7042M

AND

SLA7044M

MICROSTEPPING,
UNIPOLAR PWM, HIGH-CURRENT
MOTOR CONTROLLER/DRIVERS

DC ELECTRICAL CHARACTERISTICS at T

= +25°C, V

A

= 5 V unless otherwise noted.

DD

Limits

Characteristic Symbol Test Conditions Min Typ Max Units

FET Leakage Current I
FET ON Voltage V

FET ON Resistance r

Body Diode Forward Voltage V

Control Supply Voltage V
Control Supply Current I
Logic Input Voltage V

V

Logic Input Current I

REF/ENABLE Input Voltage V

DSS

DS(ON)

DS(on)

SD

DD

DD
IN(1)
IN(0)

IN(1)

I

IN(0)

REF/EN

VDS = 100 V — — 4.0 mA
SLA7042M, I
SLA7044M, I
SLA7042M, I
SLA7044M, I
SLA7042M, I
SLA7044M, I

= 1.2 A — — 800 mV

OUT

= 3 A — — 855 mV

OUT

= 1.2 A — — 0.67 Ω

OUT

= 3 A — — 0.285 Ω

OUT

= –1.2 A — — 1.2 V

OUT

= –3 A — — 1.6 V

OUT

Operating 4.5 5.0 5.5 V
Each controller, VDD = 5.5 V — — 7.0 mA

3.5 — — V
— — 1.5 V

V

= V

IN(1)

DD

V

= 0 — — –1.0 µA

IN(0)

— — 1.0 µA

DATA, CLOCK, STROBE, and OUT Enabled 0.4 — 2.5 V
DATA, CLOCK, STROBE, and OUT Disabled VDD - 1 — — V

REF/ENABLE Input Current I

REF/EN

0 V ≤ V

≤ 5 V — — ±1.0 µA

REF/EN

Step Reference SRCR DATA Input = 000X — 0 — %
Current Ratio DATA Input = 001X — 20 — %

DATA Input = 010X — 40 — %

DATA Input = 011X — 55.5 — %
First Bit Entered (X) = Phase DATA Input = 100X — 71.4 — %
Second Bit Entered = LSB DATA Input = 101X — 83 — %
Last Bit Entered = MSB DATA Input = 110X — 91 — %

DATA Input = 111X — 100 — %

NOTE: Negative current is defined as coming out of (sourcing) the specified device pin.

TYPICAL AC CHARACTERISTICS at T

= +25°C, V

A

= 5 V, I

DD

= 1 A, Logic Levels are VDD and

OUT

Ground

PWM OFF Time DATA Input = 001X ................................................................. 7 µs

DATA Input = 010X ................................................................. 7 µs

DATA Input = 011X ................................................................. 9 µs

DATA Input = 100X ................................................................. 9 µs

DATA Input = 101X ................................................................. 9 µs

DATA Input = 110X ................................................................ 11 µs

DATA Input = 101X ................................................................ 11 µs

Output RiseTime t
Output Fall Time t
Strobe-to-Output Switching Time t

r

f

pd

10% to 90% ........................................................................... 0.5 µs

90% to 10% ........................................................................... 0.1 µs

50% to 50% ........................................................................... 0.7 µs