LM5072 Datasheet, PDF (27/34 Pages) National Semiconductor (TI) – Integrated 100V Power Over Ethernet PD Interface and PWM Controller with Aux Support

LM5072
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SNVS437D – MARCH 2006 – REVISED APRIL 2013
Application Example #3:
Figure 33 shows an application example of the non-isolated version of Figure 31. This non-isolated version saves
many parts used in the isolated feedback example shown in Figure 31. Similar simplification also applies to the
non-isolated version of Figure 32.
Figure 33. PD Solution with Non-Isolated Flyback Topology
Application Example #4
Figure 34 shows an application example of a PD solution using the buck topology. Q2, a dual PNP transistor, is
employed in the output voltage sensing to achieve temperature compensation for the regulated output.
Figure 34. PD Solution with Buck Topology
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