STK672-541

Overview

The STK672-541 is a hybrid IC designed for unipolar, 2-phase stepper motor driving with PWM current control. It integrates overcurrent and overheat detection functions that trigger an active low fault signal to disable output current. The device includes a power-on reset function and supports Schmitt trigger inputs compatible with 2.5V logic levels. Motor current is adjustable via two external resistors in conjunction with a built-in 0.089Ω detection resistor. The enable pin allows current cutoff while maintaining excitation mode. It features simultaneous on prevention and is pin-compatible with the STK672-732AN-E.

Feature Summary

• Integrates built-in overcurrent and overheat detection mechanisms that automatically cut off output current upon fault conditions.
• Supports PWM current control for precise motor regulation with adjustable current settings using external resistors.
• Includes internal noise elimination circuits and Schmitt trigger inputs to ensure stable operation against impulse noise.
• Provides an active low fault signal output to indicate system anomalies such as thermal or electrical faults.

Applications

• Office photocopiers
• Printers
• X-Y plotters

Procurement Notes

Verify the specific ordering suffix to confirm package type and tape/reel specifications. Ensure the component matches the required voltage ratings and current capabilities for the target application. Cross-reference the datasheet revision date to confirm compatibility with existing design constraints. Confirm RoHS compliance status if environmental regulations apply to the final product assembly.

Selection Notes

Select this component for applications requiring reliable 2-phase stepper motor control with integrated protection features. Consider the pin compatibility with the STK672-732AN-E if upgrading from previous designs. Evaluate the need for PWM current control versus fixed current modes based on motor performance requirements. Verify that the external resistor values align with the desired motor current settings defined in the specifications.

Part Context

This part belongs to the STK672 series of thick-film hybrid ICs manufactured by onsemi. These devices are specialized for driving stepper motors in office automation equipment. The series offers various configurations for different phase and current requirements, providing a robust solution for precision motion control in compact form factors.

Replacement Considerations

The STK672-732AN-E is documented as having compatible pins, potentially allowing for direct substitution in some designs. Verify electrical parameters and functional differences before replacing to ensure system integrity.