The majority of energy lost in a mobile phone charger is in its no load condition, when the mobile phone is not connected but the charger has been left plugged in and using power. To combat this, in November 2008, the top five mobile phone manufacturers Nokia, Samsung, LG, Sony Ericsson, and Motorola set up a star rating system to rate the efficiency of their chargers in the no-load condition. Starting at zero stars for >0.5 W and going up to the top five star rating for <0.03 W (30 mW) no load power.
A number of semiconductor companies offering flyback controllers, such as Power Integrations and Cam Semi, now claim that the five-star standard can be achieved with use of their product.
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