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UCC28910: Changing output voltage

Part Number: UCC28910

Using the UCC28910FBEVM-526 eval kit and would like to change the output voltage to 6.5V.

I thought it could be done by just changing the values of R9=105kOhm and R8=20kOhm, however it appears that the device enters a shutdown mode whenever I apply a load to the secondary of the transformer.