Typical application circuits, Application circuit 1 – Rainbow Electronics MAX5940B User Manual
Page 10
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MAX5940A/MAX5940B
IEEE 802.3af PD Interface Controller
For Power-Over-Ethernet
10
______________________________________________________________________________________
R1*
60V
68nF
UVLO
GND
V
EE
GATE
RCLASS
PGOOD
PGOOD
DC-DC CONVERTER
PHY
GND
-48V
TX
RX
RJ-45
POWER-OVER
SPAIR PAIRS
3
6
1
2
4
5
7
8
GND
-48V
R2*
R
CL
*R1 AND R2 ARE OPTIONAL AND WHEN USED, THEY MUST TOTAL 25.5k
Ω AND REPLACE THE 25.5kΩ RESISTOR.
GND
V+
V
REG
OUT
1
2
3
4
5
6
7
8
C
OUT
C
GATE
R
DISC
25.5k
Ω
SS_SHDN
MAX5014
MAX5940B
POWER-OVER
SIGNAL PAIRS
LOAD
+
-
+
-
V
REG
Typical Application Circuits
Application Circuit 1
Figure 4. PD with Power-Over-Ethernet (Power is Provided by Either the Signal Pairs or the Spare Pairs)
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