SLA7078MPR

Overview

The SLA7078MPR is a two-phase unipolar stepper motor driver integrating CMOS logic and power MOSFET outputs. It provides complete control for motors with internal fixed off-time and PWM current control. The device supports full, half, quarter, eighth, and sixteenth-step microstepping. Logic supply voltage (Vcc) ranges from 3V to 5.5V, while load supply voltage (Vs) operates between 10V and 44V. Maximum output current capability is 3A per channel. The NMOS outputs withstand up to 46V in the off state. The component utilizes a 23-pin ZIP molded package.

Feature Summary

• Integrates sequencing logic, direction control, and synchronous/asynchronous PWM operation within a single module.
• Supports externally selectable microstepping resolutions including full, half, quarter, eighth, and sixteenth steps.
• Features self-excitation PWM current control with automatic off-time adjustment based on step reference current ratio.
• Includes built-in protection against motor coil opens and shorts, along with synchronous rectifying circuits to reduce losses.

Applications

• Personal Printer Copiers
• Office Automation Equipment

Procurement Notes

Verify the specific manufacturer designation, as Sanken Electric USA Inc. and Allegro MicroSystems both list this part number. Confirm the package type matches the design requirements, as variations exist between standard and tape-and-reel packaging suffixes. Ensure the input logic levels are compatible with the driving microcontroller or processor interface before finalizing the procurement order.

Selection Notes

Select this component when a high-current drive of up to 3A is required for unipolar stepper motors. It is suitable for designs needing integrated microstepping capabilities without external sequencers. Consider the thermal performance of the 23-pin ZIP package for the expected operating environment. Verify that the system logic voltage falls within the 3V to 5.5V range for proper operation.

Part Context

This part belongs to the SLA707xM series of two-phase unipolar stepper motor drivers. The series combines low-power CMOS logic with high-current, high-voltage power FET outputs. Variants within the series differ primarily by maximum output current ratings and available stepping modes. The SLA7078MPR represents the higher current variant within this family.

Replacement Considerations

SLA7078MR

FAQ

What microstepping resolutions does the SLA7078MPR support?

The device supports full, half, quarter, eighth, and sixteenth-step microstepping operations.

How is the output current controlled in this driver?

Output current is controlled via self-excitation PWM with a fixed off-time, which is automatically adjusted by the step reference current ratio across three levels.