The STR-W5667 is a power IC manufactured by Sanken Electric. It is designed as a quasi-resonant flyback converter, typically utilized in AC/DC power supplies. It integrates a power MOSFET and a control circuit to simplify the design and improve the efficiency of power supplies.

Applications:

• Power Adapters: Used in adapters for laptops, mobile phones, and other portable devices.
• Auxiliary Power Supplies: Implemented in industrial equipment to provide standby power.
• Consumer Electronics: Found in power supplies for DVD players, TVs, and set-top boxes.
• LED Lighting: Utilized in LED driver circuits for efficient and reliable lighting solutions.

Features:

• Quasi-Resonant Operation: This feature minimizes switching losses and improves overall efficiency by switching the MOSFET at or near the zero voltage point.
• Integrated Power MOSFET: Reduces external component count and simplifies PCB layout.
• Built-in Protection Functions: Includes Overcurrent Protection (OCP), Overvoltage Protection (OVP), and Thermal Shutdown (TSD) to ensure safe and reliable operation.
• Frequency Modulation: Reduces EMI noise by spreading the switching frequency spectrum.
• Soft-Start Function: Minimizes stress on components during startup by gradually increasing the output voltage.
• Low Standby Power Consumption: Meets energy efficiency standards by minimizing power consumption when the device is in standby mode.

Benefits:

• High Efficiency: Reduces energy waste and lowers operating costs.
• Compact Design: Allows for smaller and more lightweight power supplies.
• Improved Reliability: Protection features enhance the robustness and lifespan of the power supply.
• Reduced EMI: Frequency modulation minimizes electromagnetic interference with other devices.
• Simplified Design: Integrated components and features reduce design complexity and time.

Additional Details:

The STR-W5667 is designed for applications requiring a power range of approximately tens of watts. The quasi-resonant operation mode significantly lowers switching losses, contributing to higher efficiency, especially at lighter loads. The integrated MOSFET typically has a voltage rating suitable for universal AC input (85-265VAC). Comprehensive datasheets from Sanken Electric provide detailed electrical characteristics, application circuit examples, and thermal considerations for optimal performance and reliability. The internal protection features are critical for preventing damage due to abnormal operating conditions, and the soft-start feature ensures smooth and controlled startup, reducing stress on the power supply components. Detailed specifications regarding drain current, avalanche energy, and operating temperature can be found in the Sanken datasheet for the STR-W5667.