Topping TP20 mk2 5v

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I am about to attempt a project of adding airport expess internals to a Topping TP20 amp. I was hoping to power the airport by soldering a few wires to the amp. It requires 5v and 3.3v.
I notice that the ta2020 chip has a few 5V pins. Would it be possible to pull some power from here to run the airport express, or would this cause problems? I have done a bit of searching and reading datatsheets but haven't found the answer. Can somebody shed some light on this?
 
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