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LM25085: How to achieve the vout equare vin in LM25085?

Part Number: LM25085

hello

    l use ti lm25085 to achieve the vin=9~36V  and vout =12v/2.8A,the test reslute is

Vin=15V, T=5.3us, Toff=1.3us.

Vin=12V, T=24us, Toff=0.68us

Vin=11.7V, T=36us, Toff=0.56us

Vin=11.65V, 100% duty cycle.  

l want vin =12V .100% duty cycle  how can l progress my desgin to achieve it ?

  thank you very much!