si3400 Silicon Laboratories, si3400 Datasheet - Page 9

• Manufacturer Part Number: si3400
• Description: Fully-integrated 802.3-compliant Pd Interface And Switching Regulator
• Manufacturer: Silicon Laboratories

2. Typical Application Schematics
*Note: This is a simplified schematic. See “AN296:
Item
RJ-45
C1
C2
C3
C4
C5
C6
C7
R1
R2
R3
R4
D1
L1
Designs”
Ethernet PHY
To
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
for more details and complete application schematics.
Resistor
Resistor
Resistor
Resistor
Inductor
Diode
Type
C2
Figure 1. Schematic—Class 0 with Non-Isolated 5 V Output*
Table 8. Component Listing—Class 0 with 5 V Output
C1
1000 µF
25.5 kΩ
7.32 kΩ
2.87 kΩ
30.1 kΩ
150 pF
0.1 µF
0.1 µF
0.1 µF
3.3 nF
Value
33 µH
15 µF
R1
CT1
CT2
SP1
SP2
RDET
RCL
Using the Si3400/01 PoE PD Controller in Isolated and Non-Isolated
Preliminary Rev. 0.91
Toler.
20%
20%
20%
20%
10%
10%
10%
20%
1%
1%
1%
1%
Si3400
Si3401
C5
1/16 W
1/16 W
1/16 W
1/16 W
Rating
100 V
100 V
100 V
3.5 A
10 V
16 V
16 V
16 V
16 V
EROUT
SWO
Switcher supply capacitor. Several paral-
lel capacitors are used for lower ESR.
PD input supply capacitor.
Switcher load capacitor - 1000 µF in par-
allel with and X5R 22 µF for lower ESR.
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.
FB
C6
R4
D1
Si3400/Si3401
C4
L1
C7
R3
R2
Notes
C3
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