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UCC28700: CCM mode operation

Part Number: UCC28700
Other Parts Discussed in Thread: UCC27800, , UCC28630

Hi Team, 

My customer is designing a Flyback-converter (quasi resonant)  with the following specs:

Vin 70-920Vdc, 

Prim (aux winding) output voltage (I/O isol1500Vac_1min) : 18V 0.7A

Sec output voltage (I/O isol 3000Vac_1min): 18V 0.7A

They are considering the UCC27800 for this design, which is a Quasi resonant flyback DCM. And they would like to know if this device also operates in CCM mode and still delivers the required output power at a low Vin?

If not, do we have an alternative here? Seems like ADIs LT8316 operates in both modes. 

Thanks for the support. 

Regards, 

Obinna.