STR-W6765

AC DC Converters, Offline Switchers Overview

The STR-W6765 is a quasi-resonant topology primary switching regulator manufactured by Sanken Electric USA Inc. It integrates an avalanche-guaranteed power MOSFET with a controller IC to achieve high efficiency and low electromagnetic interference (EMI) noise through soft switching. The device supports output power ratings of 52 to 110 W for universal or 230 Vac inputs, utilizing an 800 V / 1.8 Ω internal switch. Key operational features include bottom-skip operation to maintain efficiency across varying loads and standby burst mode for light load conditions.

AC DC Converters, Offline Switchers Feature Summary

• Integrates avalanche-guaranteed MOSFET to improve system-level reliability without requiring drain-source voltage derating.
• Employs bottom-skip operation to enhance system efficiency over the entire output load range by avoiding frequency increases.
• Features standby burst mode operation to reduce input power consumption under very light output load conditions.

AC DC Converters, Offline Switchers Applications

• Offline AC-DC power supplies
• Quasi-resonant type switching power supply systems

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific manufacturer designation when sourcing this component, as the part number appears in documentation from both Sanken Electric USA Inc. and Allegro MicroSystems. Confirm that the integrated MOSFET specifications match your design requirements, particularly regarding the 800 V breakdown voltage and avalanche capability. Ensure compatibility with the intended thermal management solution for the TO-220 package variant.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs prioritizing reduced EMI noise and improved efficiency at light loads. The integrated avalanche-rated MOSFET simplifies circuit design by eliminating the need for external snubber circuits or strict VDSS derating margins. Consider the bottom-skip feature if maintaining consistent efficiency across a wide dynamic load range is critical for the application.

AC DC Converters, Offline Switchers Part Context

This component belongs to the STR-W series of quasi-resonant primary switching regulators. These devices are designed to replace discrete solutions by combining control logic and power switching in a single package. The series targets applications requiring high reliability and compliance with stringent energy efficiency standards through advanced switching modes.

AC DC Converters, Offline Switchers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.