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isolated dc dc converter for usb power input

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mess123

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I wish to know how an isolated dc dc converter works?
I usually see in the schematic that the input of the usb power is fed to the isolated dc dc converter before they are fed to the other ICs. However the grounding is same How does it really isolating power?

Thanks in advance.
 

Isolated DC/DC is a converter with a high frequency transformer. It has some applications, but usually not in USB powered devices, I think. Where do you see it?
 

Thanks Fvm.
I saw that this device "SUS30505B" are used in the PCB to isolate USB power and the VCC of the board.
Thanks.
 

If it's not accompanied by data isolation, it seems pretty useless. Also not really small for the about 2.2 W available to an USB device.
 

Why is data isolation required? I thought it is only the power circuit that requires isolation. Can the data lines also carry a large current??
 

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