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Power Integrations has introduced the LinkZero-LP, an offline-switcher IC designed to lower energy consumption of chargers and adaptors for mobile phones, media players, power tools and toothbrushes.

To reduce energy consumption, the device automatically enters a zero-input-power mode when the load is disconnected, cutting no-load power consumption to 0W.

No-load power is the energy consumed by chargers left plugged into an outlet while disconnected from the end product and has been estimated to account for two thirds of all energy consumed by mobile devices.

Short of unplugging the charger, the only means of eliminating this waste until now has been with a mechanical switch, which is rarely found on mobile-device chargers.

LinkZero-LP eliminates no-load waste without a mechanical switch, through using PI’s patented EcoSmartand#61668; energy-efficiency technology, in combination with a proprietary power-down mode that senses when no load is present then disables switching of the IC’s internal high-voltage MOSFET.

The device automatically restarts when a load is detected.

It is based on the LinkSwitch-LP range of ICs, which is used widely in mobile-phone chargers and other low-power charger/adapter applications.

LinkZero-LP maintains the hallmark simplicity of LinkSwitch-LP, enabling power supplies with fewer than 20 external components.

The new device is backward compatible with existing LinkSwitch-LP designs, enabling simple conversion to zero-no-load with no increase in component count.

Suitable for low-cost clampless designs, LinkZero-LP exhibits tight IC parameter tolerances that improve system manufacturing yield.

An extended creepage distance in the SO-8C package, plus an integrated 700 V MOSFET with hysteretic thermal shutdown protection, further improves system field reliability.

In addition, the 100kHz operating frequency minimises charger size, while frequency jittering greatly reduces the cost of EMI filtering.

LinkZero-LP devices are available now starting at $0.32 (?0.20) each for 10,000-piece quantities.

Power Integrations

Power Integrations is the leading supplier of high-voltage integrated circuits used in energy-efficient power conversion. The company’s innovative technology enables compact, energy-efficient power supplies in a wide range of electronic products, in AC-DC, DC-DC and LED lighting applications. Since its introduction in 1998, Power Integrations’ EcoSmartä energy-efficiency technology has saved an estimated $4.5 billion of standby energy waste and prevented millions of tons of CO2 emissions. The company’s Green Room web site provides a wealth of information about “energy vampires” and the issue of standby energy waste, along with a comprehensive guide to energy-efficiency standards around the world. Reflecting the environmental benefits of EcoSmart technology, Power Integrations is included in clean-technology stock indices sponsored by the Cleantech Group (Amex: CTIUS) and Clean Edge (Nasdaq: CELS).

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