UC3843: DC/DC 12Vdc to 280Vdc 400W

Part Number:UC3843

Hi Sir,

We are designing DC/DC power supply.  Spec requirement as below. 

Input : 12Vdc

Output : 250Vdc -280Vdc  , 400W

1) Could you please recommend suitable IC or reference design ? 

2) Can we use p/n UC3843 ?  Or Does it have other more suitable IC ? Please help to recommend. 

BR,

CCphi