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LTM4650 otput voltage error

Category: Hardware
Product Number: LTM4650A

Dear Sirs,

      My schematic is attached .    The  RFB is 133K , we expect a 0.87V  Vout , but actrualy it is 0.815V .    And also the VFB is meausre to to 0.557V iinntead of 0.6V?  Could you help us ? Thank you.