SANKEN ELECTRIC CO., LTD.

http://www.sanken-ele.co.jp/en/

SLA7080M Series

Description

ThisdocumentdescribesthefunctionandfeaturesofSLA7080M

series, which are unipolar 2-phase stepping motor driver ICs.

Four levels of output current are available from the incorporated

MOSFETs, corresponding to the rated output current ratings.

All current ratings are available with protection against motor

coil shorts or motor open wire detection.

The SLA7080M series has a multichip structure, for enhanced

thermal dispersion.The Control IC (MIC), four power elements

(MOSFET), and dual sense resistors, are all separate ICs.

Built-in sense resistors for each phase allow accurate track-

ing of performance without additional external components.

Low-power sleep mode as well as reduced power during PWM

off-time maximize energy savings.

Features and Benefits

normal operating range

▪ Stepping control for phase input (full or half step)

▪ Built-in sense resistor detects motor current

▪ Compact ZIP 23-pin molded package (SLA package)

▪ Self-excitation PWM control with fixed off-time

▪ Built-in synchronous rectifying circuit reduces losses at

PWM-off

▪ Synchronous PWM function prevents noise generation in

motor Hold mode

▪ Sleep function reduces power consumption of drivers in

Standby mode

▪ Protection circuit detects motor coil open/short and

prevents overheating due to avalanche breakdown

▪ Externally-adjustable (3.2 μs /5.2 μs) blanking time

(minimum on-time)

Unipolar 2-Phase Stepping Motor Driver ICs

Functional Block Diagram

Package: 23-pin ZIP (type SLA)

Not to scale

Logic Block

Synchro

Control

PWM

Control

OSC

Comp

+

-

Pre-

Driver

Protect

PWM

Control

OSC

Pre-

Driver

Protect

Comp

+

-

MIC

Reg.

SENSEB

SENSEA

GND

SYNC

Rs

Rs

28610.23, Rev. 1