ST1007WH EP10-series power6W Output voltage12V Output current0.5A POE Power Transformer
ST1007WH EP10-series power6W Output voltage12V Output current0.5A POE Power Transformer
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Yes—PoE output always comes from the primary-side CT; on the secondary side, only 2 CTs are brought out for power delivery. This part's theoretical PoE power does not exceed 30W, so there is no design issue: pins 11/12 supply power and pin 9 connects to GND.
They are not entirely the same; you must distinguish the roles of PSE (power sourcing equipment) and PD (powered device):
1. PSE side: The DC supply's positive terminal connects to the primary center tap (CT) of the Ethernet transformer, and the negative terminal connects to primary ground (or to ground via a bridge rectifier). Power is injected into the data pairs through the primary CT, achieving "phantom power."
2. PD side: DC power is extracted from the transformer's secondary center tap (CT)—the positive terminal is brought out from the CT, the negative terminal is grounded through a bridge rectifier, and power is then supplied to the load via a downstream regulator circuit.
