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Power Integrations - Energy-efficient low-power ICs for chargers / adapters
Published Nov 14 2005 

Adding to its growing portfolio of ICs designed for low-wattage power supplies, Power Integrations has introduced LinkSwitch-XT.

LinkSwitch-XT targets applications in which tight regulation of output voltage and current are key design priorities. The new ICs support universal-input (85VAC to 265VAC) chargers and adapters with output levels of up to 4W, and may be used in open-frame applications up to 9W (230VAC).

LinkSwitch-XT with EcoSmart technology is seen as ideal for use in chargers and adapters designed to comply with energy-efficiency standards for external power supplies. The simple ON/OFF control scheme of LinkSwitch-XT enables a high level of efficiency even at light loads, and reduces no-load consumption to less than 300mW. The use of a transformer with a bias winding further reduces no-load consumption to less than 50mW.

LinkSwitch-XT features a 700V power MOSFET together with control circuitry on a single silicon die. Integrated safety and reliability features include hysteretic thermal shutdown for over-temperature protection, as well as auto-restart for output short-circuit and open-loop protection.

LinkSwitch-XT is the latest addition to Power Integrations’ portfolio of low-power ICs designed to replace inefficient power supplies built around line-frequency transformers. The LinkSwitch family offers a variety of parts to meet a range of power levels and design parameters at universal input voltage. These include: Ultra-low cost, loosely regulated power supplies up to 3W - Loosely regulated power supplies up to 3.5W - Tightly regulated power supplies up to 6W - and Non-isolated buck converters up to 360mA

“Power Integrations’ LinkSwitch products are the only ICs designed specifically to replace linear chargers and adapters, which are being phased out as a result of new mandatory energy standards on external power supplies,” said Doug Bailey, vice president of marketing for Power Integrations.

"The LinkSwitch-XT is easy to design with and provides power supply developers the key advantage of time to market as equipment makers prepare their products to support the standards that take effect in 2006. With the addition of LinkSwitch-XT, we now have a complete portfolio of linear-replacement ICs. The designer can choose the desired output characteristic and be ´guaranteed´ an energy-efficient design with the lowest possible cost. We have a LinkSwitch that fits every common charger and adapter application.”

LinkSwitch-XT is available in lead-free, plastic through-hole DIP-8 and surface-mountable SMD-8 packages.

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