Rainbow Electronics MAX5940B - Manual (Page 10)

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)