ALLEGRO SLA7024M, SLA7026M, SMA7029M User Manual

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Data Sheet

SLA7024M, SLA7026M,

28201

OUT

OFF DELAY

REFERENCE

GROUND

OUT

SENSE

CNTRL SPLY

SENSE

OUT

OFF DELAY

GROUND

REFERENCE

OUT

SMA7029M

1

A

2

A

3

A

4

A

5

IN

A

6

A

7

A

8

9

B

10

B

11

B

12

B

13

B

14

IN

B

15

B

AND

SMA7029M

HIGH-CURRENT PWM, UNIPOLAR STEPPER

MOTOR CONTROLLER/DRIVERS

The SLA7024M, SLA7026M, and SMA7029M are designed for
high-efficiency and high-performance operation of 2-phase, unipolar
stepper motors. An automated, innovative packaging technology
combined with power FETs and monolithic logic/control circuitry ad-

CONTROL/LOGIC

V

REF

+

V

CC

CONTROL/LOGIC

+

V

REF

Dwg. PK-007

vances power multi-chip modules (PMCMs™) toward the complete
integration of motion control. 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 three stepper motor multi-chip modules differ
primarily in output current ratings (1.5 A or 3.0 A) and package style.

All three PMCMs are rated for an absolute maximum limit of 46 V
and utilize 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.
Normally, heat sinks are not required for the SLA7024M or SMA7029M.
The SLA7026M, in demanding, higher-current systems designs,
necessitates suitable heat transfer methods for reliable operation.

Complete applications information is given on the following pages.
PWM current is regulated by appropriately choosing current-sensing
resistors, a voltage reference, a voltage divider, and RC timing net­works. The RC components limit the OFF interval and control current
decay. Inputs are compatible with 5 V logic and microprocessors.

ABSOLUTE MAXIMUM RATINGS

at TA = +25°C

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

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

SLA7024M . . . . . . . . . . . . . . . . . . . . . 3.0 A

SLA7026M . . . . . . . . . . . . . . . . . . . . . 5.0 A

SMA7029M . . . . . . . . . . . . . . . . . . . . 3.0 A

Continuous Output Current, I

SLA7024M . . . . . . . . . . . . . . . . . . . . . 1.5 A

SLA7026M . . . . . . . . . . . . . . . . . . . . . 3.0 A

SMA7029M . . . . . . . . . . . . . . . . . . . . 1.5 A

Input Voltage Range, V
Reference Voltage, V
Package Power Dissipation, P
Junction Temperature, T
Operating Temperature Range,

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

T

A

Storage Temperature Range,

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

T

stg

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

DS

. . . . . . . . . . 46 V

CC

(t

≤ 100 µs)

OUTM

IN

REF

w

OUT

. . . . -0.3 V to 7.0 V

. . . . . . . . . . . 2.0 V

. See Graph

D

. . . . . . . . . +150°C

J

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

NMOS Outputs

DS(on)

■ Advanced, Improved Body Diodes

■ Single-Supply Motor/Module

Operation

Always order by complete part number:

Part Number Package Output Current
SLA7024M 18-Lead Power-Tab SIP 1.5 A

SLA7026M 18-Lead Power-Tab SIP 3.0 A
SMA7029M 15-Lead SIP 1.5 A

™

■ Half- or Full-Step Unipolar Drive

■ High-Efficiency, High-Speed PWM

■ Dual PWM Current Control (2-Phase)

■ Programmable PWM Current Control

■ Low Component Count PWM Drive

■ Low Internal Power Dissipation

■ Heat Sinking (Normally) Unnecessary

■ Electrically Isolated Power Tab

■ Logic IC- and µP-Compatible Inputs

■ Machine-Insertable Package

SLA7024M, SLA7026M, AND SMA7029M

13

812915101411

853

2

467

1

14

12151011181617

13

765324198

HIGH-CURRENT PWM,
UNIPOLAR STEPPER MOTOR
CONTROLLER/DRIVERS

SLA7024M and SLA7026M FUNCTIONAL BLOCK DIAGRAM

CONTROL

SUPPLY

V

CC

REG.

+

REFERENCE

DELAY

Note that channels A and B are electrically isolated.

SMA7029M FUNCTIONAL BLOCK DIAGRAM

CONTROL

SUPPLY IN

IN

IN

A/B

A/B

+

CHANNEL A PIN NUMBERS
CHANNEL B PIN NUMBERS

A/B

OUT

OUT

OUT

A/B

A/B

SENSEGROUNDOFF-TIME

Dwg. FK-005

OUT

A/B

A/B

V

CC

REG.

+

REFERENCE

DELAY

+

CHANNEL A PIN NUMBERS
CHANNEL B PIN NUMBERS

SENSEGROUNDOFF-TIME

Dwg. FK-005-1

Note that except for the control supply, channels A and B are electrically isolated.

115 Northeast Cutoff, Box 15036

™

Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1994 Allegro MicroSystems, Inc.

SLA7024M, SLA7026M, AND SMA7029M

HIGH-CURRENT PWM,
UNIPOLAR STEPPER MOTOR
CONTROLLER/DRIVERS

ALLOWABLE PACKAGE

POWER DISSIPATION

25

20

PREFIX 'SLA'
R = 5.0°C/W

θJM

15

PREFIX 'SMA'
R = 6.0°C/W

θJM

10

PREFIX 'SLA'

5

R = 28°C/W

θJA

PREFIX 'SMA'
R = 31°C/W

θJA

0

25

ALLOWABLE PACKAGE POWER DISSIPATION in WATTS

50 75 100 125 150

TEMPERATURE in °C

Dwg. GK-018

SLA7024M and SLA7026M

CONTROL/LOGIC

+

A

IN

CC

V

A

A

OUT

CNTRL SPLY

A

SENSE

B

SENSE

B

OUT

REF

V

12345 678910111213 14 15 16 17 18

A

A

OUT

A

OFF DELAY

A

GROUND

REFERENCE

A

IN

CONTROL/LOGIC

+

REF

CC

V

V

B

B

OFF DELAY

CNTRL SPLY

B

B

GROUND

REFERENCE

B

IN

B

IN

Dwg. PK-006

B

OUT

ELECTRICAL CHARACTERISTICS at T

= +25°C

A

Limits

Characteristic Symbol Test Conditions Min Typ Max Units

FET Leakage Current I
FET ON Voltage V

FET ON Resistance

Body Diode V

DSS

DS(ON)

r

DS(on)

SD

Forward Voltage (SLA7026M) I
Control Supply Voltage V
Control Supply Current I
Input Current I

Input Voltage V

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

IN(H)

I

IN(L)

IN(H)

V

IN(L)

CC

CC

VDS = 100 V, VCC = 44 V — — 4.0 mA
(SLA7024M & SMA7029M) VCC = 14 V, I
(SLA7026M) V

= 14 V, I

CC

= 3 A — — 850 mV

OUT

(SLA7024M & SMA7029M) VCC = 14 V, I
(SLA7026M) V

= 14 V, I

CC

(SLA7024M & SMA7029M) I

= –3 A — 0.9 1.6 V

OUT

= 3 A — — 285 mΩ

OUT

= –1 A — 0.9 1.5 V

OUT

= 1 A — — 600 mV

OUT

= 1 A — — 600 mΩ

OUT

Operating 10 24 44 V
VCC = 44 V — 10 15 mA
VCC = 44 V, VIN = 2.4 V — — 40 µA
VIN = 0.4 V — — -800 µA

2.0 — — V
— — 0.8 V

SLA7024M, SLA7026M, AND SMA7029M

14

12151018161713

11

HIGH-CURRENT PWM,
UNIPOLAR STEPPER MOTOR
CONTROLLER/DRIVERS

TYPICAL STEPPER MOTOR APPLICATIONS

(Half of Each Device Shown)

SLA7024M and SLA7026M

V

BB

INBIN

B

V

CC

V +5 V

b

12

R 510 Ω

TO

CHANNEL

2.4 kΩ
R

5

A

REG.

V

REF

+

+

OUT

A

B

OUT

A

B

R 100 Ω

t

d

+5 V

47 kΩ

470 pF

R

C

1

3

(Device Types as Designated)

WAVE DRIVE (FULL STEP)
for SLA7024M and SLA7026M

Sequence 0 1 2 3 0
Input A H L L L H
Input A L L H L L
Input B L H L L L
Input B L L L H L
Output ON A B A B A

HALF-STEP OPERATION (2-1-2 SEQUENCE)
for SLA7024M, SLA7026M, and SMA7029M

Sequence 0 1 2 345670
Input A H H L LLLLHH
Input A or tdA*LLLHHHLLL
Input B L H H H LLLLL
Input B or tdB*LLLLLHHHL

Output(s) ON A AB B A B A AB B A B A

*Logic signals to external open-collector inverter connected to tdA and tdB.

C 2200 pF

3

TRUTH TABLES

2-PHASE (FULL STEP) OPERATION
for SLA7024M and SLA7026M

Sequence 0 1 2 3 0
Input A H L L H H
Input A L H H L L
Input B H H L L H
Input B L L H H L
Outputs ON AB A B AB A B AB

SENSE

R

S

≤1 Ω

Dwg. EK-008

115 Northeast Cutoff, Box 15036

™

Worcester, Massachusetts 01615-0036 [phone]