LM5180EVM-DUAL: The board doesn't work after replacing the transformer for higher voltages.

Part Number: LM5180EVM-DUAL
Other Parts Discussed in Thread: LM5180, LM5181

Tool/software:

Hello,

   I am trying to replace the transform on the LM5180 EVM board for getting different voltage. My transformer is Nps=1/10, Lp= 80uH, Lleakage = 2uH. However, the LM5180 doesn't want to turn on longer than the minimum turn on time, which is roughly 140ns. Can you shed some light on  me what would be the possible issues? Really appreciate.

Frank