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求救：在调试TPS23754时，发现连握手都握手不上。是哪里出问题了吗？帮忙看下APD,PPD,T2P都是NC ,设计只考虑从POE输入，这个要从哪里入手查呢,谢谢啦
TPS23754.pdf
Dear Tao:
帮忙看看原理图有哪里不对的。谢谢啦。
Dear Johnsin Tao： 现在握手上了，空载的时候12V有输出了。但是带载不怎么行，带150MA的载就出问题了，帮忙看看哪里出问题了。谢谢
sw.rar里面是几个信号波形图，帮忙看看。谢谢啦
sw.rar
