POWER INTEGRATIONS TOP225YN TOPSwitch-II Off-Line PWM IC 100W TO-220

The POWER INTEGRATIONS TOP225YN is a second-generation, 3-terminal Off-Line PWM (Pulse Width Modulation) switch, delivering up to 100W of power. This advanced IC integrates all critical functions for a switched-mode power supply into a single, efficient monolithic chip, making it a robust and reliable choice for power conversion designs. It represents a significant upgrade over the first-generation TOPSwitch family, offering enhanced performance and simplified implementation.

Engineered for high efficiency, the device features very low AC/DC losses, achieving efficiencies of up to 90%. This not only reduces energy consumption but also minimises heat generation. Comprehensive built-in protection mechanisms include auto-restart, current limiting, and a latching thermal shutdown feature that provides robust system-level protection against overheating, ensuring long-term reliability in demanding applications.

Key Features & Benefits

• Integrated Design: Combines a power MOSFET, PWM controller, high-voltage startup circuit, loop compensation, and fault protection in one 3-pin package.
• Enhanced Robustness: Circuit improvements reduce sensitivity to board layout and line transients, simplifying the design process and improving stability.
• Operational Flexibility: Stable in both discontinuous and continuous conduction modes, and compatible with either primary-side or optocoupler feedback for design versatility.
• Improved EMI Performance: A source-connected tab helps to minimise electromagnetic interference, aiding in compliance with regulatory standards.
• Development Efficiency: Circuit simplicity and dedicated design tools from POWER INTEGRATIONS help significantly reduce time to market for new power supply projects.

With its wide input voltage range and high power switch ratings, the TOP225YN is a cornerstone component for creating efficient, compact, and reliable AC