Power Integrations TOP225YN TOPSwitch-II Off-Line PWM IC 100W TO-220

Power Integrations TOP225YN TOPSwitch-II Off-Line PWM IC delivers up to 100W of power in a single 3-pin TO-220 package.

The TOP225YN is a second-generation, 3-terminal off-line PWM (Pulse Width Modulation) switch for switched-mode power supply designs. It integrates all critical functions for a switched-mode power supply into one monolithic chip. It represents an upgrade over the first-generation TOPSwitch family, offering enhanced performance and simplified implementation.

Overview

The device is engineered for high efficiency, with very low AC/DC losses and efficiencies of up to 90%. Lower losses help reduce energy consumption and minimise heat generation. Built-in protection includes auto-restart, current limiting, and a latching thermal shutdown feature that guards against overheating.

Key Features

• 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.
• Operational flexibility: Stable in both discontinuous and continuous conduction modes, and compatible with primary-side or optocoupler feedback.
• Improved EMI performance: A source-connected tab helps minimise electromagnetic interference, aiding compliance with regulatory standards.
• Development efficiency: Circuit simplicity and dedicated design tools from Power Integrations help reduce time to market for new power supply projects.

Dimensions and Weight

• Width: 3
• Depth: 2.5
• Height: 4
• Weight: 2 gm

With its wide input voltage range and high power switch ratings, the TOP225YN is suited to creating efficient, compact, and reliable AC/DC power conversion designs.