STK672-050-E

Overview

The STK672-050-E is a thick-film hybrid IC designed as a unipolar, constant-current chopper-type stepper motor driver. It utilizes MOSFET power devices to drive 4-phase stepping motors with microstep operation support. The device integrates a 4-phase distributed controller and a built-in 0.2Ω current detection resistor. It accepts external clock inputs for sine-wave driver operation and allows selectable phase excitation modes including 2, 1-2, W1-2, 2W1-2, and 4W1-2 phases. Vector locus selection is available to match motor characteristics.

Feature Summary

• Supports microstep sine-wave driver operation using only an external clock input
• Integrates a 4-phase distributed controller for high torque and low vibration performance
• Features selectable vector locus modes to optimize motor characteristics in microstep drive states
• Includes Schmitt trigger inputs with built-in pull-up resistors to prevent malfunction due to impulse noise

Applications

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

Procurement Notes

Verify the specific suffix '-E' against the manufacturer's official ordering information to confirm compliance with environmental standards or packaging variations. Ensure that the required external reference voltage setting resistor is included in the bill of materials, as the internal resistor is designated for current detection rather than full current limiting configuration in all modes.

Selection Notes

Select this component when a unipolar constant-current chopper driver with integrated microstep control is required. The built-in 0.2Ω resistor simplifies current sensing compared to models requiring external detection resistors. Consider the pin-compatible alternatives within the STK672 series if different output current ratings or excitation schemes are needed for the target application.

Part Context

The STK672-050-E belongs to the Sanyo Semicon Device (now onsemi) STK672 family of thick-film hybrid ICs. This family provides various configurations for 2-phase and 4-phase stepping motor drivers. The -050 variant specifically targets 4-phase applications with microstep capabilities, distinguishing it from fixed-current or 2-phase specific models like the STK672-120-E or STK672-740AN-E.

Replacement Considerations

Public confirmed substitute part numbers are not explicitly documented in the provided source material. Designers should consult the official STK672 series compatibility matrix for direct pin-for-pin replacements such as other variants within the same hybrid IC family.