POWER INTEGRATIONS TNY268PN Off-Line Switcher, DIP8

The POWER INTEGRATIONS TNY268PN is a highly integrated TinySwitch-II, EcoSmart, off-line switching power supply IC designed for enhanced energy efficiency in low-power applications. Housed in a compact 8-pin DIP package, this device combines a 700V power MOSFET, oscillator, high-voltage switched current source, and comprehensive protection circuitry into a single monolithic chip. Its innovative design draws start-up and operating power directly from the drain pin, eliminating the need for a separate bias winding and associated components, which simplifies circuit design and reduces costs.

This switcher incorporates advanced features such as auto-restart, line undervoltage sensing, and frequency jittering. An intelligent control scheme minimises audio frequency components, practically eliminating audible noise even with standard taped or varnished transformer constructions. The fully integrated auto-restart circuit provides robust protection by safely limiting output power during fault conditions like short circuits or open loops, enhancing both safety and reliability while minimising external component count.

Key Features & Benefits

• High Integration: Combines controller, MOSFET, and protection in one 8-pin package.
• EcoSmart Technology: Meets stringent CEC, Energy Star, and EU energy efficiency requirements.
• Quiet Operation: Built-in circuitry eliminates audible noise from transformers.
• Comprehensive Protection: Features auto-restart, current limiting, and thermal shutdown.
• Design Flexibility: Supports output powers up to 23W (230VAC) in open-frame designs or 16W in enclosed adapters.
• Cost-Effective: Reduces transformer size (using EF12.6 or EE13 cores) and eliminates many external components, offering a compact replacement for bulky linear regulators.

With its 132kHz switching frequency, tight tolerances, and minimal temperature variation, the