New offline flyback switcher IC family delivers 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. The 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 6.1W in wide-input range designs, and up to 9.2W for 230VAC open-frame applications. Designed for flyback topologies, the family delivers designs that exhibit current and voltage regulation of better than -/+3% and typical efficiency above 80%. The 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. The 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.”