No, I tried two Motorola mini-USB chargers and it was hit-and-miss, mostly miss. I don't think it is an amperage thing because my regular PC USB hub (which always works) is very low power. There is some sort of intelligence (and a charging switch) on the USB port that does not exist on the other 5 V in.
All of the PSP game chargers I saw were rated at 1.5 or 2 amps, so similar to the Sony charger.
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