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TPS23755 上电发热问题

新设计的POE供电,插上网口后整流后输出的电压是50V,
目前插上网口就芯片很快就发热,后来测试把变压器端的4脚和芯片断开后,不发热,用示波器测试DRAIN端的波形,就感觉这快就没有打开内部的MOS管。
波形一直是50V。