I have a laptop AC Adapter thats rated for 19.5v/3.34A DC output for a total of 65W. The input is rated at 100-240V/1.5A AC. My question is what is limiting the output to 65W? It seems like the input can support up to 100*1.5=150W minimum. I"m assuming you lose some in the AC to DC conversion, but 65W would be more than 50% loss. So, is the adapter able to support more than 65W or is there something here I'm missing?
Electronic – AC Adapter Input vs Output Power
acadapter
Best Answer
I do power supply design for a living. When I specify that this circuit is rated for 19.5v/3.34A 65W, there could be so many reasons for this. Few arbitrary examples include:
any many more possible things...
EDIT: As for the 1.5Amps input current, this is the maximum instantaneous current the adapter will pull from the input. It is NOT an RMS value.