Power Integrations

TOP222P

TOP222P Description

The TOP222P from Power Integrations is a high-performance offline switching IC designed for AC/DC power conversion applications. This obsolete through-hole-mounted device integrates a 700V breakdown voltage MOSFET, making it suitable for robust power supply designs. It supports multiple topologies including Boost, Buck, Flyback, and Forward, offering flexibility in circuit implementation. With a 15W power rating and 100kHz switching frequency, it delivers efficient power conversion while maintaining isolation for safety-critical applications. The IC features built-in fault protection mechanisms such as current limiting and over-temperature shutdown, enhancing system reliability.

TOP222P Features

• Integrated 700V MOSFET: Reduces external component count and simplifies design.
• Multi-Topology Support: Compatible with Boost, Buck, Flyback, and Forward configurations.
• Fault Protection: Includes current limiting and thermal shutdown for robust operation.
• High Switching Frequency (100kHz): Enables compact magnetics and improved efficiency.
• Isolated Output: Ensures safety in offline power supplies.
• 67% Duty Cycle: Optimizes performance in discontinuous conduction mode (DCM) designs.
• REACH Unaffected & EAR99 Compliance: Meets environmental and export control standards.

TOP222P Applications

The TOP222P is ideal for:

• Low-Power AC/DC Adapters: Due to its 15W capability and isolated output.
• Auxiliary Power Supplies: For industrial equipment, leveraging its fault protection features.
• LED Drivers: Where high-voltage handling and efficiency are critical.
• Consumer Electronics: Such as set-top boxes or small appliances requiring reliable offline conversion.
  Its through-hole (8DIP) packaging makes it suitable for prototyping and legacy designs, though newer surface-mount alternatives may be preferred for modern applications.

Conclusion of TOP222P

While the TOP222P is now obsolete, its versatile topology support, integrated protection, and high-voltage capability made it a standout choice for offline power supplies in its time. Engineers valued its simplicity and reliability in 15W applications, particularly where isolation and robustness were paramount. For current designs, Power Integrations offers advanced successors with improved efficiency and smaller form factors, but the TOP222P remains a proven solution for maintenance or legacy systems.