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TPS54560B: At output of 12V, how much A can the current Max reach?

Part Number: TPS54560B

Hi TI team:

   I use TI TPS54560B. It can be seen from the product description that Vin(Max):60V,Vout (Max): 58.8v and Iout (Max): 5A,I do the actual test, the questions are as follows, please answer:

1.I use input 53V and output 12V. When the current reaches 2.5A, the output voltage jumps. Why?

2.Output 12V/3A, is that possible?

Schematic diagram is as follows: