TPS2373: TPS2373

Part Number: TPS2373

Tool/software:

Hello.

  We are lost, we are trying to get a board running with PoE as supply, When running the system with one power pair the PoE gets active after some 10-15 seconds, but if we go for high power it takes almost 90 seconds for negotiations to complete. In all cases, when negotiations are completed, it looks like it runs a expected. 

  We do not have a Fly-Back or like set up so VC_Out is floating and VC_in is held at 12V with a resistor and a diode. We do believe we have tried anything, but still have no clues on why it is so slow on detection. What could we have missed ?

BRGDs
  Klavs.