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+12V Power-Over-Ethernet Application Kit - Hardware Reference
Figure 1. POE_12V_JS_0 TOP Placement
Figure 2. POE_12V_JS_0 BOTTOM Placement
2.1.2 Flyback Transformer
The flyback transformer is a coupled inductor with multiple windings wound on a single gapped
core. For simplification, we refer to the first, driven winding, as the primary and the main output
winding as the secondary winding of the flyback transformer.
The flyback converter is a converter in which inductive energy is stored by applying a voltage
across the primary in a similar manner to that of a boost converter. A second coupled winding
(secondary) of the inductor transfers the energy to a secondary side rectifier after the primary
voltage has been switched off.
In the PoE application kit, the LM5070 directly drives a MOSFET switch to apply voltage across
the primary. When the switch turns off, the secondary applies a forward current to the output
rectifier and charges the output capacitors.
6
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