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TPS7A4700RGWT regulation issue

Hongwei Ju
Prodigy 171 points


Hi,

I use two stages of TPS7A4700RGWT to get a 3.3V output form a +15V supply, bellow is the schematic and PCB layout, now the issue is that we can get correct output from 1st stage (~8.04V), but cannot get right value from second stage (~4.33V, suppose to be 3.3V), could anybody advise on this?