Offline Switcher IC Eliminates No-Load Waste

Power Integrations has introduced the Linkzero-LP, a highly integrated offline switcher IC targeting chargers and adapters up to 3.2W for portable devices such as mobile phones and toothbrushes. Linkzero-LP automatically enters a zero-input-power mode when the load is disconnected, cutting no-load power consumption to 0.00W. No-load power - the energy consumed by chargers left plugged into an outlet while disconnected from the end product - 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 - a feature rarely found on mobile device chargers. Linkzero-LP eliminates no-load waste without a mechanical switch, using Power Integrations' Ecosmart energy efficiency technology, in combination with a proprietary power-down mode that senses when no load is present and then disables switching of the IC's internal high-voltage Mosfet.

The Linkzero-LP device automatically restarts when a load is detected. Linkzero-LP is based on the Linkswitch-LP family of ICs, which is used in mobile phone chargers and other low-power charger/adapter applications. Linkzero-LP enables power supplies with fewer than 20 external components. The device is backward-compatible with existing Linkswitch-LP designs, enabling quick, easy conversion to zero-no-load with no increase in component count.

Suitable for low-cost clamp-less designs, Linkzero-LP exhibits tight IC parameter tolerances, which improves system manufacturing yield. An extended creepage distance in the SO-8C package, plus an integrated 700V Mosfet with hysteretic thermal shutdown protection, further improves system field reliability. Moreover, the 100kHz operating frequency minimises charger size, and frequency jittering reduces the cost of EMI filtering.

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