SLA7042M 查看數據表（PDF） - Allegro MicroSystems

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SLA7042M

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

Allegro MicroSystems 

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

Dwg. PK-008

ABSOLUTE MAXIMUM RATINGS

at TA = +25°C

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

FET Output Voltage, VDS . . . . . . . . . . . 100 V

Control Supply Voltage, VDD . . . . . . . . . 7.0 V

Peak Output Current,

IOUTM (tw ≤ 10 µs) . . . . . . . . . . . . . . . . 5.0 A

Continuous Output Current, IOUT

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

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

Input Voltage Range,

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

Reference Voltage, VREF . . . . . . . . . . . . VDD

Package Power Dissipation, PD . See Graph

Junction Temperature, TJ . . . . . . . . . +150°C

Operating Temperature Range,

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

Storage Temperature Range,

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

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 (IOUT ≈ [VREF/3 • RS] • 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 rDS(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.

BENEFITS AND FEATURES

s Cost-Effective, Multi-Chip Solution

s ‘Turn-Key’ Motion-Control Module

s Motor Operation to 3 A and 46 V

s 3rd Generation High-Voltage FETs

s 100 V, Avalanche-Rated NMOS

s Low rDS(on) NMOS Outputs

s Advanced, Improved Body Diodes

s Microstepping Unipolar Drive

s 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 .

™

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