Power Integrations LNK304PN Off-Line Switcher IC, 85-265V AC, DIP-7

The Power Integrations LNK304PN is a highly efficient, low-component-count off-line switcher IC from the LinkSwitch-TN family. It is engineered to replace linear and capacitor-fed power supplies for applications requiring under 360mA output, delivering superior performance and energy efficiency at an equivalent system cost.

This advanced device integrates a robust 700V power MOSFET, an oscillator, a straightforward on/off control scheme, and comprehensive protection features—including cycle-by-cycle current limiting and thermal shutdown—all onto a single monolithic chip. Its innovative design draws start-up and operating power directly from the drain pin voltage, eliminating the need for a separate bias supply in buck or flyback converter configurations.

Key Features & Benefits

• Universal Input: Accepts a wide AC input voltage range from 85V to 265V.
• Integrated Protections: Features built-in auto-restart for fault conditions (short-circuit/open-loop), current limit, and hysteretic thermal shutdown for enhanced system reliability.
• High Performance: Offers excellent line and load regulation, fast turn-on with no overshoot due to high bandwidth, and current limit operation that effectively rejects line ripple.
• Design Flexibility: Supports buck, buck-boost, and flyback converter topologies, providing versatility for various power supply designs.
• Superior Efficiency: Delivers significantly higher efficiency and power factor than traditional passive or capacitor-fed solutions.
• Manufacturing Ready: The design is entirely manufacturable using surface-mount device (SMD) processes, simplifying production.

With tight tolerances and negligible performance variation across temperatures, the LNK304PN is a reliable and cost-effective solution for creating compact, efficient power supplies.