ltc4267-3 Linear Technology Corporation, ltc4267-3 Datasheet - Page 26

• Manufacturer Part Number: ltc4267-3
• Description: Power Over Ethernet Ieee 802.3af Pd Interface With Integrated 300khz Switching Regulator
• Manufacturer: Linear Technology Corporation

LTC4267-3
26
APPLICATIO S I FOR ATIO
RJ45
RJ45
RJ45
1
2
3
6
4
5
7
8
1
2
3
6
4
5
7
8
1
2
3
6
4
5
7
8
U
TX
TX
RX
RX
TX
TX
RX
RX
TX
TX
RX
RX
+
–
+
–
+
–
+
–
+
–
+
–
SPARE
SPARE
SPARE
SPARE
SPARE
SPARE
OPTION 2: AUXILIARY POWER INSERTED AFTER LTC4267-3 PD WITH SIGNATURE DISABLED
U
+
–
+
–
+
–
OPTION 3: AUXILIARY POWER APPLIED TO LTC4267-3 PD AND SWITCHING REGULATOR
TRANSFORMER
TRANSFORMER
TRANSFORMER
ISOLATED
ISOLATED
ISOLATED
WALL
WALL
WALL
T1
T1
T1
OPTION 1: AUXILIARY POWER INSERTED BEFORE LTC4267-3 PD
W
+
38V TO 57V
–
+
–
+
–
38V TO 57V
TO PHY
TO PHY
TO PHY
Figure 16. Auxiliary Power Source for PD
U
~
~
~
~
~
~
~
~
~
~
~
~
HD01
HD01
HD01
HD01
HD01
HD01
BR1
BR2
BR1
BR2
BR1
BR2
+
–
+
–
+
–
+
–
+
–
+
–
S1B
D8
D3
SMAJ58A
TVS
D3
SMAJ58A
TVS
D3
SMAJ58A
TVS
V
V
V
LTC4267-3
PORTN
LTC4267-3
PORTN
LTC4267-3
PORTN
SIGDISA
V
V
V
PORTP
PGND
PORTP
PGND
PORTP
PGND
P
P
P
P
P
P
C14
0.1µF
100V
VCC
OUT
C14
0.1µF
100V
VCC
OUT
C14
0.1µF
100V
VCC
OUT
D10
S1B
BSS63
42673 F16
PGND
C1
C1
100k
100k
S1B
D10
S1B
D9
R
PGND
START
C
R
PVCC
START
C
C1
PVCC
R
PGND
START
C
PVCC
42673f