Conversion ICs reduce phone-charger power use
Power Integrations
Linkswitch-II
Power Integrations has announced that its Linkswitch-II family of power conversion ICs enables manufacturers of mobile phone-chargers to achieve the five-star rating for no-load energy consumption.
The rating system, launched by the world's top five mobile phone makers, covers all chargers currently sold by Nokia, Samsung, Sony Ericsson, Motorola and LG Electronics.
Efficiency ratings range from five stars for the most efficient chargers down to zero stars for units consuming the most energy.
If left plugged into an electrical outlet, mobile phone chargers continue to use electricity even when disconnected from the phone.
To achieve the five-star rating, chargers may not exceed 0.03W (30mW) power consumption in no-load mode.
This no-load power consumption is believed to account for up to two-thirds of the electricity used by mobile phones.
Mobile phone manufacturers estimate that if the three billion mobile devices in service today were using four- or five-star chargers, the world would save an amount of energy equal to the yearly output of two mid-sized power stations.
Power Integrations' Linkswitch-II power conversion ICs enable manufacturers to achieve the five-star rating - and meet other efficiency specifications, such as Energy Stare 2.0 - without increasing the cost of their chargers.
Linkswitch-II uses Power Integrations' EcosmartE technology to automatically adjust power consumption when the charger enters a no-load condition.
It eliminates the need for optocouplers and secondary-side CV/CC control circuitry, as well as all control-loop compensation circuitry.
This reduces component count by as much as 30 per cent, and improves energy efficiency, since secondary-side components consume power.
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