Hey all;
Suppose you have a switching supply like this one:
http://www.suntekstore.com/goods-14002072-lm2596_dc-dc_step-down_adjustable_power_supply_module.html
It's rated for 2A output. Does all the previous circuitry have to be rated for 2A as well? IOW, if you were powering this from a wall outlet, would the stepdown transformer also have to be rated at 2A, along with the rectification circuit?
I assume the answer is yes, until I look at some other PS units. I've got a wall wart that supplies 1700mA at 9v, and there's no way there's a transformer big enough in there to deliver that kind of power. Or what about computer PS? I've cracked open a few of these, and I can't imagine that the dinky little transformers in there can source the 18A or whatever the supply demands.
How are they getting away with using these small transformers?
Thanks
Suppose you have a switching supply like this one:
http://www.suntekstore.com/goods-14002072-lm2596_dc-dc_step-down_adjustable_power_supply_module.html
It's rated for 2A output. Does all the previous circuitry have to be rated for 2A as well? IOW, if you were powering this from a wall outlet, would the stepdown transformer also have to be rated at 2A, along with the rectification circuit?
I assume the answer is yes, until I look at some other PS units. I've got a wall wart that supplies 1700mA at 9v, and there's no way there's a transformer big enough in there to deliver that kind of power. Or what about computer PS? I've cracked open a few of these, and I can't imagine that the dinky little transformers in there can source the 18A or whatever the supply demands.
How are they getting away with using these small transformers?
Thanks