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OPA2314-Q1: suggestion on output

Part Number: OPA2314-Q1

Hi Expert,

My customer is using OPA2314-Q1 in their OBC product and to sense the output current. You can find their schematic as below. 

Customer set the reference voltage on Vout is 1.65V when input differential voltage=0V. Customer found that there will have some offset from board to board on reference voltage of Vout. Some board measured TP35(test point)=1.65V, some board measured TP35(test point)=1.63V. The offset from board to board is about 20mV. 

May you kindly suggest how to decrease the offset? 

Thanks!

Ethan Wen