sla7051mlf871 Allegro MicroSystems, Inc., sla7051mlf871 Datasheet

sla7051mlf871

Manufacturer Part Number

sla7051mlf871

Description

Unipolar Stepper-motor Translator/pwm Driver

Manufacturer

Allegro MicroSystems, Inc.

Datasheet

1.SLA7051MLF871.pdf (12 pages)

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Driver Supply Voltage, V

Load Supply Voltage, V

Output Current, I

Logic Supply Voltage, V

Logic Input Voltage Range,

Sense Voltage, V

Reference Input Voltage Range,

Package Power Dissipation,

Junction Temperature, T

Operating Temperature Range,

Storage Temperature Range,

* Output current rating may be limited by duty cycle,

ambient temperature, and heat sinking. Under any set of

conditions, do not exceed the specified current rating or

junction temperature.

† Internal filtering provides protection against transients

during the first 1 µs of the current-sense pulse.

REF ..................................

.......................... -0.3 V to V

....................................... See Graph

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

............................... -30°C to +150°C

BSOLUTE

........................... 2.0 A*

........................ ±2.0 V†

AXIMUM

-0.3 V to V

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

............. +150°C

................ 7.0 V

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

ATINGS

+ 0.3 V

from Allegro MicroSystems

SLA7051M

power FET outputs, the SLA7051M translator/driver provides complete

control and drive for a two-phase unipolar stepper motor with internal

fixed off time, pulse-width modulation (PWM) control of the output

current in a power multi-chip module (PMCM™).

full/half-step control, synchronous/asynchronous PWM operation, and a

“sleep” function. The minimum CLOCK input is an ideal fit for

applications where a complex µP is unavailable or overburdened. TTL

or LSTTL may require the use of appropriate pull-up resistors to ensure

a proper input-logic high. For PWM current control, the maximum

output current is determined by the user’s selection of a reference

voltage and sensing resistor. The NMOS outputs are capable of sinking

up to 2 A and withstanding 46 V in the off state. Ground-clamp and

flyback diodes provide protection against inductive transients

power-up sequencing is not required.

Two-phase drive energizes two adjacent phases in each detent position

(AB-BC-CD-DA). This sequence mode offers an improved torque-

speed product, greater detent torque, and is less susceptable to motor

resonance. Half-step excitation alternates between the one-phase and

two-phase modes (A-AB-B-BC-C-CD D-DA), providing an eight-step

sequence.

package with leads formed for vertical mounting (suffix LF871) or

horizontal mounting (suffix LF872). The tab is at ground potential and

needs no insulation. For high-current or high-frequency applications,

external heat sinking may be required. This device is rated for continu-

ous operation between -20°C and +85°C.

Always order by complete part number, e.g., SLA7051MLF871 .

Sanken Power Devices

EATURES

Combining low-power CMOS logic with high-current, high-voltage

The CMOS logic section provides the sequencing logic, direction,

Full-step (2 phase) and half-step operation are externally selectable.

The SLA7051M is supplied in an 18-pin single in-line power-tab

2 A Output Rating

Internal Sequencer for Full or Half-Step Operation

PWM Constant-Current Motor Drive

Cost-Effective, Multi-Chip Solution

100 V, Avalanche-Rated NMOS

Low

Advanced, Improved Body Diodes

Half-Step and Full-Step Unipolar Drive

Inputs Compatible with 3.3 V or 5 V Control Signals

Sleep Mode

Internal Clamp Diodes

DS(on)

UNIPOLAR STEPPER-MOTOR

TRANSLATOR/PWM DRIVER

NMOS Outputs (300 m

typical)

. Special

Related parts for sla7051mlf871

sla7051mlf871 Summary of contents

Page 1

... V, Avalanche-Rated NMOS r Low NMOS Outputs (300 m DS(on) Advanced, Improved Body Diodes Half-Step and Full-Step Unipolar Drive Inputs Compatible with 3 Control Signals Sleep Mode Internal Clamp Diodes Always order by complete part number, e.g., SLA7051MLF871 . Sanken Power Devices from Allegro MicroSystems . Special typical) ...

Page 2

... Recommended operating conditions Load Supply Voltage, V Logic Supply Voltage, V Reference Input Voltage, V Tab Temperature (no heat sink), T 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright © 2002, 2004 Allegro MicroSystems, Inc. ................................. ........................... 3 5 .................... 0 1.0 V REF ...................... <100°C ...

Page 3

Electrical characteristics: unless otherwise noted at T Characteristic Symbol Output drivers Driver Supply Volt. Range V BB Drain-Source Breakdown V (BR)DS Output On Resistance r DS(on) Body Diode Forward Volt. V Driver Supply Current I BB Control logic Logic Supply ...

Page 4

SLA7051M UNIPOLAR STEPPER-MOTOR TRANSLATOR/PWM DRIVER 4 Timing chart Logic input timing 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 ...

Page 5

Device operation. The SLA7051M is a complete stepper-motor driver with built-in translator for easy operation with minimal control lines designed to operate unipolar stepper motors in full-step or half-step modes. The current in each pair of outputs, all ...

Page 6

SLA7051M UNIPOLAR STEPPER-MOTOR TRANSLATOR/PWM DRIVER Layout. The printed wirting board should use a heavy ground plane. For optimum electrical and thermal performance, the driver should be soldered directly into the board. The driver supply terminal, VBB, should be decoupled with ...

Page 7

Reference voltage. In the Typical Application shown, resistors R and R set the reference voltage as )/(R REF DD 2 The trimming of R allows for the resistor tolerances 2 and REF input ...

Page 8

SLA7051M UNIPOLAR STEPPER-MOTOR TRANSLATOR/PWM DRIVER given +25°C limits, which may be caused by internal heating during normal operation. These power MOSFET outputs feature an excellent combination of fast switching, ruggedized device design, low on resistance, and cost effectiveness. Avalanche energy ...

Page 9

... UNIPOLAR STEPPER-MOTOR TRANSLATOR/PWM DRIVER The products described herein are manufactured in Japan by Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc. Sanken and Allegro reserve the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products ...

Page 10

... The shaded area is exposed heat spreader. 3. Recommended mounting hardware torque: 0.490 - 0.822 Nm. 4. Recommended use of metal-oxide-filled, alkyl-degenerated oil-base silicone grease: Dow Corning SC102, Toshiba YG6260, Shin-Etsu G746, or equivalent. 10 SLA7051MLF871 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Dimensions in millimeters (controlling dimensions) ...

Page 11

NOTES: 1. Exact body and lead configuration at vendor’s option within limits shown. 2. Lead spacing tolerance is non-cumulative. 3. The shaded area is exposed heat spreader. 3. Recommended mounting hardware torque: 0.490 - 0.822 Nm. 4. Recommended use of ...

Page 12

SLA7051M UNIPOLAR STEPPER-MOTOR TRANSLATOR/PWM DRIVER 12 Packing information 18 devices per stick/tube. A rubber stopper is provided at each end of the stick/tube. 20 sticks/tubes in Y direction; 3 layers of sticks/tubes in Z direction = 1080 devices per box. ...

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