Rainbow-electronics MAX5940B Manuel d'utilisateur télécharger pdf (Page 12)

MAX5940A/MAX5940B

IEEE 802.3af PD Interface Controller

For Power-Over-Ethernet

12 ______________________________________________________________________________________

60V

68nF

UVLO

GND

GATE

RCLASS

PGOOD

DC-DC CONVERTER

GND

-48V

WALL

ADAPTER

SUPPLY

GND

V+

VREG

OUT

GATE

DISC

25.5kΩ

SS_SHDN

MAX5014

MAX5940B

LOAD

4kΩ

Typical Application Circuits (continued)

Figure 6. Adding Wall Adapter Input Supply (Wall Adapter Supply And Power-Over-Ethernet Co-Exist, the One with Higher Voltage

Provides Power To The Load)

Application Circuit 3

D2 prevents the wall adapter power from polluting the

discovery and classification signatures. The optional

R4 provides the 10mA minimum power maintenance

signature to keep the power-over-ethernet from discon-

necting.

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Rainbow-electronics MAX5940B Manuel d'utilisateur Page 12