SLA7072MS

Overview

The SLA7072MS is a 2-Phase Unipolar Stepper Motor Driver from the Sanken SLA707xM series, housed in a 23-pin Power Multi-Chip Module (PMCM). It integrates low-power CMOS logic with high-current, high-voltage power FET outputs to provide complete control for two-phase unipolar stepper motors. The device supports external selection of full-step and half-step operation modes. 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. The NMOS outputs are capable of sinking up to 2A and withstanding 46V in the off state.

Feature Summary

• Integrates CMOS sequencing logic with high-current power FET outputs for direct stepper motor drive without complex microprocessor interfaces.
• Features internal fixed off-time and pulse-width modulation (PWM) control for precise output current regulation.
• Includes clamp diodes to protect against inductive transients and eliminates the need for special power-up sequencing.
• Supports externally selectable full-step and half-step excitation sequences via simple input pins.

Applications

• Personal Printer Components
• Office Automation Equipment
• Peripheral Component Interconnect (PPC) Systems

Procurement Notes

Verify the specific suffix 'MS' against the official Sanken Electric datasheet to confirm pinout compatibility and thermal characteristics. Ensure the application circuit provides appropriate pull-up resistors if using TTL or LSTTL logic inputs to guarantee proper logic high levels. Confirm that the system design accommodates the 23-pin package requirements and that the reference voltage and sensing resistor selections align with the desired 2A sink current capability.

Selection Notes

Select this component when driving two-phase unipolar stepper motors requiring integrated control and drive in a compact module. It is suitable for applications where a complex microprocessor is unavailable or overburdened, as it accepts simple clock and direction inputs. Choose this part for designs needing PWM current control and protection against inductive spikes without external discrete components. Verify that the 44V motor supply and 5.5V logic supply constraints fit the system architecture.

Part Context

The SLA7072MS belongs to the SLA707xM(P)R family of 2-Phase Unipolar Stepper Motor Drivers manufactured by Sanken Electric Co., Ltd. This series combines CMOS logic with power FETs in a PMCM package. Other members include SLA7070M through SLA7078M, which vary in step resolution capabilities, such as quarter, eighth, or sixteenth-step options found in higher-numbered variants like the SLA7075M.

FAQ

What step modes are supported by the SLA7072MS?

The SLA7072MS supports externally selectable full-step and half-step operations. Half-step excitation alternates between one-phase and two-phase modes to provide an eight-step sequence.

How is the output current controlled in this driver?

Output current is controlled via internal fixed off-time and pulse-width modulation (PWM). The maximum output current is determined by the user's selection of a reference voltage and a sensing resistor.