Datasheet
LTC4267
25
4267fc
Figure 16. Auxiliary Power Source for PD
APPLICATIO S I FOR ATIO
WUUU
RX
–
6
RX
+
3
TX
–
2
TX
+
RJ45
T1
1
7
8
5
4
SPARE
–
+
–
SPARE
+
ISOLATED
WALL
TRANSFORMER
TO PHY
V
PORTP
OPTION 1: AUXILIARY POWER INSERTED BEFORE LTC4267 PD
OPTION 2: AUXILIARY POWER INSERTED AFTER LTC4267 PD WITH SIGNATURE DISABLED
V
PORTN
P
OUT
PGND
PGND
38V TO 57V
D8
S1B
D3
SMAJ58A
TVS
C1
PGND
PGND
C14
0.1µF
100V
RX
–
6
RX
+
3
TX
–
2
TX
+
RJ45
T1
1
7
8
5
4
SPARE
–
+
–
SPARE
+
ISOLATED
WALL
TRANSFORMER
TO PHY
V
PORTP
SIGDISA
LTC4267
LTC4267
BR2
HD01
~
~
+
–
BR1
HD01
~
~
+
–
BR1
HD01
~
~
+
–
V
PORTN
P
OUT
4267 F16
D10
S1B
D3
SMAJ58A
TVS
C1
100k
D9
S1B
OPTION 3: AUXILIARY POWER APPLIED TO LTC4267 PD AND SWITCHING REGULATOR
RX
–
6
RX
+
3
TX
–
2
TX
+
RJ45
T1
1
7
8
5
4
SPARE
–
+
–
SPARE
+
ISOLATED
WALL
TRANSFORMER
TO PHY
38V TO 57V
V
PORTP
LTC4267
V
PORTN
P
OUT
D10
S1B
D3
SMAJ58A
TVS
C1
C14
0.1µF
100V
C14
0.1µF
100V
BR2
HD01
~
~
+
–
BR1
HD01
~
~
+
–
BR2
HD01
~
~
+
–
100k
BSS63
R
START
C
PVCC
R
START
C
PVCC
R
START
C
PVCC
PGND
P
VCC
PGND
P
VCC
P
VCC