Astonishing little AC/DC-adaptor

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The discussion centers on the compact design of a portable phone's AC/DC adaptor, which raises questions about its internal technology. Unlike traditional transformers that generate heat due to resistance, this adaptor remains cool when plugged in, suggesting a different mechanism at work. The use of the LTC1541 IC chip is highlighted as a key component in its efficient operation. The thread seeks clarification on the specific techniques that allow for such a small and efficient power supply. Understanding these advancements in power supply technology can provide insights into modern electronic design.
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I have a question that maybe an engineer could answer. The voltage adaptor that came with my portable phone (Ericsson) in order to recharge its batteries made me wonder a lot. It is very small, about the size of a matchbox, and yet not much heavier. It's hard to believe that there's a coil with an iron core hidden inside, as in a standard voltage transformator. I also noticed that normal trafo's get warm simply if they're plugged in (and not in use) as a result of the ohm resistance (or whatever the word is) of the coil - this one doesn't.

Can anyone explain to me what technique is used here?
 
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Based on this article:

http://www.elecdesign.com/Articles/Index.cfm?ArticleID=6185

They use a LTC1541 IC chip. Here are the specs:

http://www.linear.com/pdf/15412fas.pdf
 
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