Quote:
Originally Posted by gwynevans
USB is a standard voltage (5V) but you might find that 'dumb' chargers don't charge the Sony Reader via the USB port, although they will via the other (round) charger port.
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you don't really need a smart charger to charge the battery; I have a strong hunch the reader has an internal system that coordinates the charging, provided it gets enough power to perform that task.
Even the Sony PSP adaptor is nothing more than a fancy old 'transformator',delivering the right voltage, & power, with build in capacitors to even out the output.
If the device can charge from a USB port it means the device needs a current of 500mA 5V or less,and some form of intelligent battery charging system inside.
I suspect the charger must be no less than 500mA, or you won't be able to slowcharge the reader via USB.
A mini USB connector generally has 4 lines,2 of which are powerlines (+5V, 0V), the 2 other are datachannels.
Generally a usb device taps power off the 2 channels, and even in chargemode normally doesn't interact with the charger. The arranging of charging (Smartcharger) is inside the reader itself.
Probably an AC adaptor using the chargerplug will only allow the reader to go into quickcharge.