Great article by Ken Shirriff on the circuit and build of the iPhone charger. Like most people, I think I have taken this little device for granted for the years that I’ve owned an iPhone.
Disassembling Apples diminutive inch-cube iPhone charger reveals a technologically advanced flyback switching power supply that goes beyond the typical charger. It simply takes AC input anything between 100 and 240 volts and produce 5 watts of smooth 5 volt power, but the circuit to do this is surprisingly complex and innovative.
Ken Shirriff’s blog: Apple iPhone charger teardown: quality in a tiny expensive package
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