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LT3511 flyback converter - Lower output voltage than expected

Category: Hardware
Product Number: LT3511

I am using the LT3511 to construct the 12V to +/- 70 V isolated flyback converter in its datasheet.

With no load, I am getting +/- 48 V. 

I want to know why there's a discrepancy between the expected and actual output voltage and how this can be rectified.