Launched in October 2010, the LinkZero-AX integrated offline switching IC family now offers increased main power output up to 6.5 watts — double the maximum output of earlier members of the product family. The expanded power range enables designers to utilize LinkZero-AX in a wider array of applications, including those with multiple auxiliary power functions, as is often the case in appliances, TVs, and remotely controlled electronic lighting ballasts.
LinkZero-AX eliminates wasted energy by employing an innovative power-down mode that effectively turns off the auxiliary power supply when the application is idle, shutting down switch-mode operation and internal switch control circuits. LinkZero-AX can be re-awakened from power-down mode with a reset pulse or button press. Also, the bypass pin can provide up to 500 μA for use by any system-control or sensing circuit.
Key features of the LinkZero-AX family, including the special power-down mode, are described in the free-to-download PI University video course. The video also discusses how to handle transient load conditions and wake-up requirements, and how to deliver power to auxiliary outputs (such as IR receivers) during power-down mode.
Comments Silvestro Fimiani, product marketing manager at Power Integrations: “Last year, we launched the industry’s first IEC 62301 ‘Zero No-Load’ IC family for appliances with the cost-effective LinkZero-AX. Extending the power range of LinkZero-AX to 6.5 watts means that appliance applications which require multiple auxiliary power functions can now achieve zero no-load.”
Auxiliary power supplies continuously draw power as long as the product is plugged in, typically resulting in significant standby energy waste. LinkZero-AX ICs can reduce this usage to a minuscule 3 mW — low enough to be considered “zero” under IEC standards. (IEC 62301 Clause 4.5 classifies power usage of than 5 mW as zero.) Five years of continuous standby operation at 3 mW would consume less than 2 cents worth of energy.
Delivering the industry’s lowest component count for standby power supplies, LinkZero-AX is a simple design upgrade and allows designers to easily exceed all global energy-efficiency regulations, including the European EcoDesign Directive and ENERGY STAR®. LinkZero-AX ICs are available now in SO-8C or SMD-8C packages priced at $0.41 each for 10,000-piece quantities (LNK586DG).