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TPS23861: transformer input or output connection

Part Number: TPS23861

Hello

          Below is two reference design. For transformer has tow connection, one is input and the other is output. Could I know what is correct transformer connection? Thank you.   

      http://www.ti.com/lit/an/slua818/slua818.pdf 

     http://www.ti.com/lit/df/tidrro1/tidrro1.pdf

transformer choke connect to input

transformer choke connect to output