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TPS23785B: Is a buck converter available for the TPS23785B?

Part Number: TPS23785B
Other Parts Discussed in Thread: TPS2378

Hi.

I have a question.

I'm going to design the PD(Powered Device) of PoE(Power over Ethernet).

(IEEE 802.3at. / 25W)

I will use TPS23785B parts. 

   ** If you have any good parts other than TPS23785B, please recommend it

In the TPS23785B component recommendation circuit, a power conversion element is designed as a transformer.

I'm gonna use a buck converter( DC DC Converter)

There's no problem using the buck converter, right?
I don't need a isolate circuit.

Thanks Please.