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Si3402
2. Typical Application Schematics
To
Ethernet PHY
C5
RJ-45
CT1
FB
C4
R3
C3
CT2
SP1
Si3402
D1
R2
R1
SP2
RDET
SWO
L1
EROUT
RCL
C6
C2
C1
R4
C7
Figure 1. Schematic—Class 0 with Non-Isolated 5 V Output*
*Note: This is a simplified schematic. See “AN296: Using the Si3400/1/2 PoE PD Controller in Isolated and Non-Isolated
Designs” for more details and complete application schematics.
Table 7. Component Listing—Class 0 with 5 V Output
Item
C1
Type
Capacitor
Value
15 μF
Toler.
20%
Rating
100 V
Notes
Switcher supply capacitor. Several paral-
lel capacitors are used for lower ESR.
C2
C3
Capacitor
Capacitor
0.1 μF
1000 μF
20%
20%
100 V
10 V
PD input supply capacitor.
Switcher load capacitor - 1000 μF in par-
allel with and X5R 22 μF for lower ESR.
C4
C5
C6
C7
R1
R2
R3
R4
D1
L1
Capacitor
Capacitor
Capacitor
Capacitor
Resistor
Resistor
Resistor
Resistor
Diode
Inductor
0.1 μF
0.1 μF
3.3 nF
150 pF
25.5 k ?
8.66 k ?
2.87 k ?
30.1 k ?
33 μH
20%
10%
10%
10%
1%
1%
1%
1%
20%
16 V
16 V
16 V
16 V
1/16 W
1/16 W
1/16 W
1/16 W
100 V
3.5 A
VDD bypass capacitor.
Softstart capacitor.
Compensation capacitor.
Compensation capacitor.
Detection resistor.
Feedback resistor divider.
Feedback resistor divider.
Feedback compensation resistor.
Schottky diode; part no. PDS5100.
Coilcraft part no. DO5010333.
8
Rev. 1.31
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