Offline Flyback Switcher ICs with High Accuracy and Efficiency

Power Integrations has introduced its LinkSwitch™-XT2 family of offline, low-power converter ICs offering high accuracy, high efficiency and excellent no-load performance. LinkSwitch-XT2 ICs target isolated and non-isolated flyback applications in which accurate regulation of output voltage and current are important. The new ICs can deliver up to 6.1 Watts in wide-input range designs, and up to 9.2 Watts for 230Vac open-frame applications.

Designed for flyback topologies, the LinkSwitch-XT2 family delivers designs that exhibit current and voltage regulation of better than ±3% and typical efficiency above 80%. LinkSwitch-XT2 ICs consume less than 10mW in no-load conditions. High (132kHz) operating frequency enables the use of small power transformers, while the programmable current limit (ILIM) function enables further transformer optimization.

LinkSwitch-XT2 converters combine a 725V power MOSFET with control circuitry on a single silicon die. Integrated safety and reliability features include input overvoltage protection, hysteretic thermal shutdown for over-temperature protection, and auto-restart for output short-circuit, overvoltage and open-loop protection.

Comments senior product marketing manager Silvestro Fimiani: “The accuracy, small size, efficiency and excellent no-load performance of LinkSwitch-XT2 ICs makes them ideal for small appliances such as microwave ovens, IoT applications, utility meters, industrial and smart-home installations.”

LinkSwitch-XT2 ICs come in three packages: P-package (DIP-8C), D-package (SO-8C), and G-package (SMD-8C) and are priced at $0.40 in 10,000-piece quantities. Power Integrations also offers reference design DER-578, which details a 5V 500 mA power supply.