I've test a board using TPS23754. And shemetic is same with reference design PMP10288. If the auxiliary voltage is entered, it is working but does not operate when the PoE input is applied. no output ...

The DC/DC converter supplies 9 Watts @5V to connected devices. This Function Board configures the PoE supply voltage to the IEEE802.3af Alternate B power scheme. This power scheme uses the spare pairs ...

During the actual production test, 4 POE chips were damaged in more than 80 units.For the reason of damage, our preliminary judgment is that the voltage value of the adapter input is higher than the ...