Wednesday 12 July 2017

power supply - What would be the input current of buck regulator


I have a basic question about measuring input current. The buck regulator I have chosen is rated to deliver 3.3V/2A from +12V input. My question is -


Is the input current 2A (load current) + few mA (needs for operation)?


Or because of stepdown from 12V to 3.3V, based on load current, the input current is 500mA + few mA?


Is the 2A output current taken entirely from the input or step down conversion delivers 2A after consuming few mA.





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