Instruction Manual

MAX5945
Quad Network Power Controller
for Power-Over-LAN
38 ______________________________________________________________________________________
Figure 15. PoE System Diagram of One Complete Port, Endpoint PSE
MAX5945
-48V
GATE_
INTERNAL PULLDOWN
(MANUAL MODE)
1kΩ
-48VRTN
FDT3612
100V, 120mΩ
SOT-223
SENSE_
V
EE
OUT_
OFF
ON
DET_
SDAIN
SDAOUT
SCL
DGND
V
DD
A0
A1
A2
A3
OSC_IN
AUTO
MIDSPAN
AGND
INTERNAL PULLDOWN
(SIGNAL MODE)
0.5Ω
1%
1N4448
1kΩ
1 OF 4 CHANNELS
1.8V TO 5V,
(REF TO DGND)
INT
RESET
3kΩ
3kΩ
180Ω
180Ω
180Ω
OPTIONAL BUFFER
INTERNAL
50kΩ PULLUP
4.7kΩ
1kΩ
V
DD
1N4002
HPCL063L
OPTIONAL BUFFER
OPTIONAL BUFFER
HPCL063L
HPCL063L
VCCRTN
V
CC
(3.3V)
SCL
SDA
SERIAL INTERFACE
3kΩ
3kΩ
ISOLATION
0.47µF
100V
SHD_
SINE WAVE
100Hz ±10%
PEAK AMPLITUDE 2.2V ±0.1V
VALLEY AMPLITUDE 0.2V ±0.1V
SMBJ
58CA
0.1µF 2.2MΩ
-48VOUT
8
7
5
4
6
3
2
1
-48VOUT
0.1µF
0.1µF
0.1µF
0.1µF
75Ω
75Ω 75Ω
75Ω
1000pF
250VAC
24
22
21
19
23
20
RX1+
RX1-
TX1+
TX1-
RXT1
TXCT1
RD1+
RD1-
TD1+
TD1-
1
3
4
5
PHY
1/2 OF
H2005A
RJ–45
CONNECTOR