STK672-533-E

Overview

The STK672-533-E is a unipolar constant-current chopper-type stepping motor driver hybrid IC manufactured by Sanyo Semicon Device. It utilizes MOSFET power devices to drive externally-excited 4-phase stepping motors. The device integrates a microstep operation-supported 4-phase distributed controller, enabling high torque and low vibration performance with a simple control circuit. Key electrical specifications include a maximum output current of 1.5 A and a supply voltage range of 5 V to 24 V. It requires an additional 5 V +/- 5% supply for logic operations. The component is housed in a SIP22 package with 22 terminals.

Feature Summary

• Microstep sine-wave driver operation supported by only an external clock input
• Selectable phase excitation modes including 2, 1-2, W1-2, 2W1-2, and 4W1-2 via external pins
• Built-in Schmitt trigger inputs with pull-up resistors to prevent malfunction from impulse noise
• Phase hold function maintained during excitation switching

Applications

• Printer stepping motor drivers
• Copier stepping motor drivers
• X-Y plotter stepping motor drivers

Procurement Notes

Verify the manufacturer designation as Sanyo Semicon Device rather than onsemi, as the STK672 series originates from Sanyo. Confirm the specific suffix '-E' aligns with RoHS compliance or specific packaging variants if required by your Bill of Materials. Ensure the 5V logic supply requirement is integrated into your system design, as the IC cannot operate solely on the main motor supply voltage.

Selection Notes

Select this component when driving unipolar 4-phase stepping motors requiring microstep resolution and low noise characteristics. The built-in current detection resistor simplifies external component count. Consider the 1.5 A output limit and the 24 V maximum supply voltage when matching motor specifications. The SIP22 package is suitable for applications where thermal dissipation through the case is sufficient without additional heatsinking.

Part Context

The STK672 series represents a family of hybrid ICs designed for stepping motor control. Variants such as the STK672-010 and STK672-050 offer different current ratings and excitation types. The STK672-533-E specifically targets applications needing precise microstep control with a chopper-drive mechanism to maintain constant current regardless of back-EMF variations.

FAQ

Does the STK672-533-E support bipolar motors?

No, the STK672-533-E is designed specifically for unipolar externally-excited 4-phase stepping motors.

What is the purpose of the ENABLE pin?

The ENABLE pin allows for excitation current cutoff, which reduces system current drain when the driver is stopped.