Power Integrations

TOP244Y

TOP244Y Description

The TOP244Y from Power Integrations is an obsolete but historically significant offline switcher IC designed for flyback topology applications. This through-hole mounted device integrates a 700V breakdown voltage MOSFET, making it suitable for high-voltage AC/DC conversion up to 65W. It operates within a switching frequency range of 66kHz to 132kHz, with a 66.5% duty cycle, and features isolated output for enhanced safety. The IC incorporates built-in fault protection (current limiting, over-temperature, and over-voltage), ensuring robust performance in demanding environments.

TOP244Y Features

• Integrated 700V MOSFET: Eliminates the need for an external switch, reducing component count.
• Frequency Control: Adjustable switching frequency (66kHz–132kHz) for optimized efficiency.
• Comprehensive Protection: Combines current limiting, over-temperature, and over-voltage safeguards.
• High Power Handling: Supports up to 65W, ideal for mid-power applications.
• Isolated Output: Ensures compliance with safety standards for offline power supplies.
• Durable Packaging: TO-220-7C through-hole design for reliable thermal performance.

TOP244Y Applications

The TOP244Y excels in offline power supplies for:

• Industrial Equipment: Power modules, motor drives, and control systems.
• Consumer Electronics: Adapters, set-top boxes, and LED drivers.
• Telecom/Networking: Auxiliary power for routers and switches.
• Lighting: High-efficiency ballasts and LED power supplies.
  Its obsolete status may limit new designs, but it remains a reference for legacy systems requiring high-voltage isolation and compact power solutions.

Conclusion of TOP244Y

While the TOP244Y is no longer in production, its integration of a high-voltage switch, robust protection features, and isolated output made it a standout choice for flyback converters. Engineers valued its simplicity, reliability, and power density, particularly in industrial and consumer applications. For modern designs, consider newer alternatives from Power Integrations, but the TOP244Y remains a benchmark for cost-effective, high-performance offline switching.