TOP249YN Off-line Switcher IC

The TOP249YN Off-Line Switcher IC is a high-performance, energy-efficient AC-DC power conversion IC designed for switched-mode power supplies (SMPS). Part of the TOPSwitch™ family, this device integrates a high-voltage power MOSFET, PWM controller, oscillator, and comprehensive protection circuitry into a single compact component.

The TOP249YN simplifies SMPS design by reducing external components while delivering reliable and stable output performance. It supports a wide input voltage range and is suitable for medium to high-power applications. The “YN” variant comes in a TO-220 package, offering improved thermal performance and easy heat sink mounting for higher power designs.

With built-in protection features such as over-temperature shutdown, over-current limiting, auto-restart during fault conditions, and line over-voltage protection, the TOP249YN ensures safe, durable, and efficient operation in demanding environments.

Key Features :

• Integrated high-voltage power MOSFET

• Advanced PWM control

• Wide AC input voltage range

• Over-temperature protection

• Over-current & short-circuit protection

• Auto-restart fault protection

• Line over-voltage protection

• TO-220 (YN) package for better heat dissipation

• High efficiency and reduced component count