DC1561B - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
1
TRD1+
TRCT1
TRD1-
2
3
D
TRD2+
TRCT2
IN FROM
PoE+
PSE
6
TRD2-
4
TRD3+
TRCT3
5
TRD3-
7
TRD4+
TRCT4
8
TRD4VC1
VC2
VC3
VC4
APPROVED
DATE
RYAN H.
02-02-2012
4
6
OUT
TO
PHY
5
3
D
1
U2
2
VCC
8
PS2801-1-L
R1
10K
7
TXCT
9
13
14
15
16
1
4
2
3
T2P
E14
R8
10K
RXCT
C34
4.7nF
2kV
SPARE2
L2
8.2uH
4 X 75 Ohms
2
J1
C6
C2
3.3uF
+ C5
D1
SMBJ58A
10uF
R9
20K
D11
BAS21
R2
47
Q3
FMMT624
+
C3
C1
22uF
C9
100uF
C10
OPT
R33
620
11
12
T1
EPC3472G-LF
3
4
D17
7.5V
CMHZ4693
R10
20
+VOUT
E1
1
2
R3
OPT
100V
7499511001
180nH
7
8
6
1
SHIELD
SHIELD
+VOUT
L1
5
1nF 2kV
R38
0
PRODUCTION
10
4 X 12nF
C
DESCRIPTION
1
12
SPARE1
18
17
REV
1
11
C7
220pF
[email protected]
D15
C
LED
GREEN
-VOUT
E3
C4
1nF
Q2
HAT2169H
AUX+
R15
10
E10
Auxiliary Supply
VPORT_N
VPORTN
24K
2
D13
S1B
R36
30.9
1
AUXE12
A
GND
3
SG
PG
9
24
10
VCC
31
8
NC
NC
25
NC
T2P
/PWRGD
2
30
29
R23
12K
R24
100K
20
19
C27
1uF
R16
12m
3
EPA4271GE
3
C26
33nF
R27
3.3K
D14
BAT54
4
R28
10K
C11
OPT
C33
3.3nF
2
D12
PDS5100H
CUSTOMER NOTICE
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
TECHNOLOGY
AK
RYAN H.
HIGH EFFICIENCY PoE+PD AND SWITCHER
WITH 12V AUX SUPPORT
3
N/A
SCALE = NONE
2
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
B
6
T2
17
R22
15
C28
2.2nF
1
GND
33
CCMP
21
SFST
OSC
R25
R26
1.82K 38.3K C30 C31 C32
33pF
0.1uF
OPT.
C24
1uF
100
D16
B1100
E13
5
+VOUT
CMLT3820G
1
1
2
E11
14
C25
1nF
15
R21
VCMP
ENDLY
E9
R20
3.01K
Q7
R17
1
UVLO
12
R19
54.9K
C13
OPT
SENSE-
SHDN
RCMP
SPARE2
Q6
CMLT7820G
exposed pad, solder side
NC
SYNC
1
18
0
SENSE+
22
SPARE2
D9
FB
13
D6
4
BSS63LT1
R18
20K
E8
16
TON
SPARE1
D8
C12
OPT
R12
294K
Q5
PGDLY
D7
1
VPORTP
11
3
3.3mH
32
23
4
E7
2
NC
VNEG
VNEG
RXCT
L3
28
27
26
1
Q1
FDMS86101
R11
1uF
C19
16V
PWRGD
LTC4278IDKD
R14
2.49K
NC
VPORTN
VPORTN
D5
RCLASS
D2
B
SPARE1
5.1
E6
U1
7
6
5
E4
C99
1nF
100V
3
D4
TXCT
0.1uF
100V
2
E2
3
RXCT
PWRGD
E5
VPORTP
D3
TXCT
PWRGD
R37
OPT
C8
8V - 57V
VPORT_P
R13
21.5K
R34
VCC
DATE:
IC NO.
LTC4278IDKD
REV.
1
DEMO CIRCUIT 1561B
Wednesday, February 01, 2012
SHEET 1
1
OF 1
A
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