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AD5270 Ground issue; Vss GND difference.

Category: Hardware
Product Number: AD5271

Hello,

I am using AD5270 with boost converter for generating high voltages. But when the boost converter start, there is a problem with feedback section. In my opinion,as the high voltage circuit GND and AD5271 GND is the same, the problem occurs. In oscilloscope, I saw the fluctuations in gorund. But how should I connect the grounds, is there a difference with VSS and logic GND of AD5271? 

Thank you in advance.