Specifications
Si3460-EVB
14 Rev. 1.2
Not Recom
m
en
ded
for N
ew D
esigns.
Please Co
n
s
i
d
e
r Si3462 for
N
ew
D
esigns.
8. Si3460-EVB Schematics and PCB Layout
Full schematics and layout information are provided in the following sections. To ensure you are using the latest
schematic and PCB layout database revisions, download the following zip file from the Silicon Laboratories Si3460
documentation page:
http://www.silabs.com/products/power/poe/Pages/PowerSourcingEquipment.aspx
8.1. Schematics
0
Drain
DETA
DC1
250K
Drain
Vdd
Vee
Vdd
DC2
PWM
0.5W
0.3V
1W
1W
Schottky
0.5W
Place both near MCU
Vout(+)
Vout(-)
Vin (-)
Vin (+)
Reset
Common mode chokes for GbE midspan
M1
FQD12P10
M1
FQD12P10
C19
47u
C19
47u
R44 127R44 127
R31NP R31NP
R5
499
R5
499
U3
MIC4417
U3
MIC4417
GND
1
Out
2
Vcc
3
CTL
4
C8 0.1uC8 0.1u
C20
68u
35V
C20
68u
35V
U19A
LM319
U19A
LM319
OUT
12
+
4
-
5
G
3
V+
11
V-
6
C210.1u /50V C210.1u /50V
L3B
FA2536-ALD
L3B
FA2536-ALD
6
5
4
R45 20KR45 20K
C12
10n
C12
10n
C1 0.1uC1 0.1u
R41 18.2KR41 18.2K
R18
100K
R18
100K
D12 SMAJ58AD12 SMAJ58A
R302K R302K
C15
0.1u
C15
0.1u
C4
0.1u
C4
0.1u
D13
551-0207
D13
551-0207
R40 332R40 332
R4 2.49R4 2.49
C17
0.1u
C17
0.1u
Q12
BC856
Q12
BC856
U2
Si3460
U2
Si3460
GATE
1
CTRL1
2
CTRL2
4
250KHz
5
DETA
6
VSENSE
7
ISENSE
9
STATUS
10
RST
8
VDD
3
GND
11
R7 40.2KR7 40.2K
J8
RJ45
J8
RJ45
3
1
4
2
5
6
7
8
D8 B2100D8 B2100
R8 66.5KR8 66.5K
R221K R221K
C7 0.1uC7 0.1u
U1
TLV431
U1
TLV431
L3A
FA2536-ALD
L3A
FA2536-ALD
1
2
3
C3
1u
C3
1u
R43 1.3kR43 1.3k
C16 1uC16 1u
C13
0.1u
C13
0.1u
R24 1kR24 1k
M2
FQT5P10
M2
FQT5P10
C9 0.1uC9 0.1u
S1
0
S1
0
R42 1.82KR42 1.82K
R28
NP
R28
NP
L5 330OhmsL5 330Ohms
1
2
C11
27n
C11
27n
C2 10uC2 10u
L1 150uHL1 150uH
1
2
R47 1.3kR47 1.3k
J7
RJ45
J7
RJ45
3
1
4
2
5
6
7
8
C18
0.1u
C18
0.1u
L2 4.7uHL2 4.7uH
1
2
C14
1u
C14
1u
J4
CONN JACK PWR
J4
CONN JACK PWR
3
2
1
R27
10.5
R27
10.5
Figure 10. Si3460 and Power Circuit