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POE方案选择

Other Parts Discussed in Thread: TPS23754

我需要使用POE给20W左右的负载供电,在选择PD方案。

除了功率要满足以外,还要PCB面积尽量小,现在选择了集成DCDC的TPS23754,请帮忙看看合适吗?

另外还有个疑问,802.3at规定的PD端最大功耗是25.5W,是指PD的输入最大是25.5W吧,如果效率80%的话,输出20W给我的设备刚刚够。怎么能保证PD输入在25.5W呢?如果再低系统可能就带不起来了。