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DC2652A-B LTC3888-1 demoboard is burned when i change set IOUT_CAL_GAIN

Category: Hardware
Product Number: DC2652A-B
Software Version: LTpowerPlay

Dear Sir:

    When i  change set IOUT_CAL_GAIN from default value 5mΩ to 4.7 mΩ.then DC2652A-B board is burned immediately

   And  I borrow DC2652A-B boards from agents , and do the same test,then the same thing happens

  What is the cause? Thank you!!