Typical application circuits (continued) – Rainbow Electronics MAX5940B User Manual
Page 13
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MAX5940A/MAX5940B
IEEE 802.3af PD Interface Controller
For Power-Over-Ethernet
______________________________________________________________________________________
13
60V
68nF
UVLO
GND
V
EE
GATE
RCLASS
PGOOD
PGOOD
DC-DC CONVERTER
GND
-48V
WALL
ADAPTER
SUPPLY
R
CL
D1
GND
V+
VREG
OUT
1
2
3
4
5
6
7
8
C
OUT
C
GATE
R
DISC
25.5k
Ω
SS_SHDN
MAX5014
MAX5940B
LOAD
Typical Application Circuits (continued)
Application Circuit 4
If the wall adapter supply comes up first, it provides
power to the load and pollute the discovery and classi-
fication signatures. If the power-over-ethernet comes
up first, it powers the load until taken over by a wall
adapter with higher output voltage.
Figure 7. Adding Wall Adapter Input Supply (the One with Higher Voltage Provides Power to the Load)
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