Chapter 1. Product Overview. MICROCHIP MTS2916A Dual Full-Bridge Stepper Motor Driver, ADM00308

MTS2916A DUAL FULL-BRIDGE

STEPPER MOTOR DRIVER

EVALUATION BOARD USER’S GUIDE

Chapter 1. Product Overview

1.1

INTRODUCTION

This chapter provides an overview of the MTS2916A Dual Full-Bridge Stepper Motor

Driver Evaluation Board and covers the following topics:

• MTS2916A Short Overview

• What is the MTS2916A Dual Full-Bridge Stepper Motor Driver Evaluation Board?

• MTS2916A Dual Full-Bridge Stepper Motor Driver Evaluation Board Kit Contents

1.2

MTS2916A SHORT OVERVIEW

The MTS2916A stepper motor driver is a CMOS device capable of driving both windings of a bipolar stepper motor or bidirectionally controlling two DC motors. Only the stepper motor application is covered by this user’s guide. Each of the two independent H-Bridge outputs is capable of sustaining 40V and delivering 750 mA of continuous current. The user must ensure that the thermal guidelines are followed and the driver does not exceed the maximum junction temperature of +150°C. The driver will typically enter in thermal shutdown at a junction temperature of +170°C. The output current level is controlled by an internal Pulse-Width Modulation (PWM) circuit that is configured using two logic inputs, a current sense resistor and a selectable reference voltage.

Full, half and microstepping operations are possible with the PWM current control and logic inputs. The maximum output current is set by a sense resistor and a user selectable voltage reference. The evaluation board voltage reference is controlled with the run switch and is detailed in

Section 2.4.1 “Powering the MTS2916A Dual

Full-Bridge Stepper Motor Driver Evaluation Board” . Each bridge has an

independent phase input that controls the current flow direction for its specific load.

Internal clamp diodes protect against inductive voltage transients. The thermal protection circuitry disables the outputs when the junction temperature exceeds the thermal protection threshold. The thermal protection circuitry typically has 25°C of hysteresis. Undervoltage lockout circuitry prevents the outputs from going active until the logic supply voltage is high enough to assume control. No special power-up sequencing is required.

 2012-2013 Microchip Technology Inc.

DS50002058B-page 9

MTS2916A Dual Full-Bridge Stepper Motor Driver Evaluation Board User’s Guide

5V

C

PHASE1

I01

I11

V

REF1

V

LOGIC

Logic

Current

Sense

Comparator

One-shot

Undervoltage

Lockout

Shift Drivers

Thermal

Shutdown

Power

Bridge

V

LOAD

OUT1A

C C

10V to 30V

V

LOAD

OUT1B

PHASE2

I02

I12

V

REF2

Logic

Current

Sense

Comparator

One-shot

Shift Drivers

Power

Bridge

OUT2A

OUT2B

M

COMPIN1 COMPIN2

Rt

RC2 RC1

Ct

Rt

GND

Ct

Rc

Cc

Cc

Rc

SENSE1

Rs Rs

SENSE2

FIGURE 1-1: Typical MTS2916A Stepper Motor Driver Application.

1.3

WHAT IS THE MTS2916A DUAL FULL-BRIDGE STEPPER MOTOR DRIVER

EVALUATION BOARD?

The MTS2916A Dual Full-Bridge Stepper Motor Driver Evaluation Board control circuitry is designed to typically operate from a 6V to 12V logic input (internally regulated down to 5V) and a 10V to 30V V

LOAD

input. V

LOAD

provides power to the motor windings. Test points are generously distributed throughout the evaluation board.

This gives the user easy access and visibility, facilitating a better understanding of the

MTS2916A operating details.

1.4

MTS2916A DUAL FULL-BRIDGE STEPPER MOTOR DRIVER EVALUATION

BOARD KIT CONTENTS

The MTS2916A Dual Full-Bridge Stepper Motor Driver Evaluation Board kit contains the following items:

• MTS2916A Dual Full-Bridge Stepper Motor Driver Evaluation Board (ADM00308)

• Important Information Sheet

DS50002058B-page 10

 2012-2013 Microchip Technology Inc.