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TPS2378做的pd无法上电,存在兼容性问题?

Other Parts Discussed in Thread: TPS2378

用TPS2378和OB2263排的pd,原理图如上。

1:成品出来:用max5971芯片做的PSE供电给这个pd,pd可以上电。可以输出14v1.5a

2:用Microsemi的POE供电器3501G供电,pd确不上电。

3:用芯片PD69104B生产的poe交换机,和用TPS23861PM生产的poe交换机,给pd供电,pd都无法上电。

请教大神,我的pd的设计图的问题了哪里?万分感谢