POEPHYTEREV-I National Semiconductor, POEPHYTEREV-I Datasheet - Page 22

• Manufacturer Part Number: POEPHYTEREV-I
• Description: BOARD EVAL LM5072, DP83848I
• Manufacturer: National Semiconductor
• Series: PHYTER®r

Specifications of POEPHYTEREV-I

• Main Purpose: Special Purpose DC/DC, Power Over Ethernet
• Outputs And Type: 1, Isolated
• Power - Output: 24W
• Voltage - Output: 3.3V
• Current - Output: 7.3A
• Voltage - Input: 39 ~ 57V
• Regulator Topology: Flyback
• Frequency - Switching: 250kHz
• Board Type: Fully Populated
• Utilized Ic / Part: DP83848, LM5072
• Lead Free Status / RoHS Status: Not applicable / Not applicable

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Application Example #1
Figure 18 shows an application example of a single isolated output solution for the PD. Both front auxiliary (FAUX) and rear auxiliary
(RAUX) power options are given, although only one option may be needed in practice. Note that for the RAUX option, D2 is only
installed when the supply voltage of the auxiliary power source would cause the V
Application Example #2
Figure 19 shows an example of an isolated, dual-output solution for the PD. The 3.3V output is tightly regulated while the 5V output
is cross-regulated. Both front auxiliary (FAUX) and rear auxiliary (RAUX) power options are given, although only one option may
be needed in practice. Note that for the RAUX option, D2 is only installed when the supply voltage of the auxiliary power source
is lower than 14.5V.
FIGURE 18. PD with Isolated, Single Output Solution
FIGURE 19. PD with Isolated, Dual Output Solution
22
IN
voltage to be below 14.5V.
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