POWER INTEGRATIONS TinySwitch-III AC/DC Off-Line Switcher IC, DIP-8

The POWER INTEGRATIONS TinySwitch-III is an advanced, energy-efficient off-line switcher IC designed to simplify and enhance power supply designs. This highly integrated flyback controller incorporates a robust 700V power MOSFET, oscillator, high-voltage switched current source, and comprehensive protection circuitry including user-selectable current limit and thermal shutdown. Its intelligent ON/OFF control scheme delivers constant efficiency even under very light loads, making it an ideal choice for meeting stringent global energy efficiency regulations and specific standards like the 1W PC standby requirement.

Engineered for reliability and low system cost, the TinySwitch-III enables designs with a very low component count, facilitating simple single-sided PCB layouts. Key performance benefits include high bandwidth for fast, overshoot-free start-up and excellent transient load response. The integrated EcoSmart™ technology ensures extreme energy efficiency, with no-load consumption as low as 50mW when using a bias winding.

Enhanced Safety and Reliability Features

• Accurate Thermal Protection: Hysteretic thermal shutdown with automatic recovery eliminates the need for manual reset.
• Advanced Fault Protection: Improved auto-restart function limits power to less than 3% of maximum during short-circuit or open-loop conditions.
• Output Safety: Features output overvoltage shutdown, configurable with an optional Zener diode.
• EMI Reduction: Built-in frequency jittering significantly reduces electromagnetic interference, lowering filter costs.
• Quiet Operation: Electrically quiet SOURCE pins contribute to low EMI, while the pin-out is optimised to simplify heat sinking directly to the PCB.

This self-biased IC requires no external bias winding or components, further simplifying design and reducing bill-of-material costs. With tight parameter tolerance and a wide