SLA7075MR

Overview

The SLA7075MR is a two-phase unipolar stepper motor driver from Sanken Electric, integrating low-power CMOS logic with high-current, high-voltage power FET outputs in a PMCM package. It provides complete control for stepper motors with internal fixed off-time and PWM current regulation. The device supports externally selectable full, half, quarter, eighth, and sixteenth-step operation. Key electrical specifications include a maximum motor supply voltage (VM) of 44V, a load supply voltage (Vs) range of 10V to 44V, and a logic supply voltage (Vcc) of 3V to 5.5V. Outputs are NMOS capable of sinking up to 2A and withstanding 46V.

Feature Summary

• Integrates CMOS sequencing logic with high-current power FETs for direct stepper motor control without complex interfaces.
• Supports multiple step resolutions including full, half, quarter, eighth, and sixteenth steps via external selection.
• Features internal pulse-width modulation (PWM) current control with user-defined reference voltage and sensing resistor settings.
• Includes clamp diodes for inductive transient protection and a dedicated sleep function for power management.

Applications

• Personal Printer Copier (PPC) systems
• Office Automation (OA) equipment
• Printer mechanisms

Procurement Notes

Verify the specific suffix 'MR' against the manufacturer's official datasheet to confirm pinout compatibility and stepping mode capabilities. Ensure the application circuit includes appropriate pull-up resistors if using TTL or LSTTL logic inputs to guarantee proper logic high levels. Confirm that the external sensing resistor and reference voltage selections align with the desired output current limits specified in the technical documentation.

Selection Notes

Select this component when driving two-phase unipolar stepper motors requiring integrated sequencing and PWM current control. It is suitable for applications where a microprocessor is unavailable or overloaded, as it accepts simple clock and direction inputs. Choose based on the required step resolution; this model specifically supports quarter, eighth, and sixteenth steps in addition to full and half steps. Ensure the system voltage does not exceed the 44V maximum ratings for VM and Vs.

Part Context

The SLA7075MR belongs to the SLA707xM series of 2-Phase Unipolar Stepper Motor Drivers manufactured by Sanken Electric. This family combines CMOS logic with power FETs in a Power Multi-Chip Module (PMCM). The series is designed to simplify stepper motor control by eliminating the need for phase-sequence tables or high-frequency control lines, offering a compact solution for office automation and printer applications.

Replacement Considerations

Consult official substitution guides for verified equivalents within the SLA707xM series, such as the SLA7070M through SLA7078MR variants. Verify that any substitute part matches the specific step-mode capabilities (e.g., quarter/eighth/sixteenth step support) and pin configuration before implementation.

FAQ

What step modes are supported by the SLA7075MR?

The SLA7075MR supports externally selectable full-step, half-step, quarter-step, eighth-step, and sixteenth-step operations.

How is the output current controlled in this driver?

Output current is regulated via internal pulse-width modulation (PWM) control, determined by the user's selection of a reference voltage and an external sensing resistor.

Does the SLA7075MR require special power-up sequencing?

No, special power-up sequencing is not required for the SLA7075MR.