SI3402-EVB Silicon Laboratories Inc, SI3402-EVB Datasheet - Page 10

• Manufacturer Part Number: SI3402-EVB
• Description: BOARD EVAL POE FOR SI3402
• Manufacturer: Silicon Laboratories Inc
• Type: PWM Controllersr

Specifications of SI3402-EVB

• Main Purpose: Special Purpose DC/DC, Power Over Ethernet
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 5V
• Voltage - Input: 44 ~ 57V
• Regulator Topology: Buck
• Frequency - Switching: 350kHz
• Board Type: Fully Populated
• Utilized Ic / Part: Si3402
• Input Voltage: 5 V
• Output Voltage: 3.3 V
• Interface Type: Ethernet
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Product: Power Management Modules
• For Use With/related Products: Si3402
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1827

Si3402
*Note: This is a simplified schematic. See “AN296: Using the Si3400/1/2 PoE PD Controller in Isolated and Non-Isolated
10
PS2911
TLV431
Item
C1
C2
C3
C4
C5
C7
C8
R1
R2
R3
R4
R5
R6
R7
R8
D1
D2
D3
T1
Designs” for more details and complete application schematics.
RJ-45
To Ethernet PHY
Voltage reference
Transformer
Optocoupler
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Diode
Diode
Diode
Type
C2
Table 9. Components—Class 1 with Isolated 5.0 V Output
Figure 2. Schematic—Class 1 with Isolated 5.0 V Output*
R1
R8
C1
1100 µF
25.5 k
4.99 k
2.05 k
36.5 k
12.1 k
220 nF
0.1 µF
0.1 µF
Value
100 
127 
10 k
40 µH
15 µF
15 nF
15 V
1 µF
10 A
1 A
CT1
CT2
SP1
SP2
RDET
RCL
Si3402
Toler.
20%
20%
20%
10%
10%
20%
20%
1%
1%
1%
1%
1%
1%
1%
1%
Rev. 1.2
ISOSSFT
EROUT
SWO
VDD
C7
Rating
1/16 W
1/16 W
1/16 W
1/16 W
1/16 W
1/16 W
1/16 W
1/16 W
100 V
100 V
100 V
10 V
16 V
16 V
16 V
16 V
40 V
D2
D3
9 A
C8
R2
C5
R3
T1
PS2911
Switcher supply capacitor. Several paral-
lel capacitors are used for lower ESR.
PD input supply capacitor.
Switcher load capacitor. 100 µF in paral-
lel 1000 µF and optional 1 µH inductor
for additional filtering.
Feedback compensation.
Feedback compensation.
VDD bypass capacitor.
Isolated mode soft start (tie ISOSSFT to
VDD if this feature is not used).
Detection resistor.
Pull-up resistor.
Feedback compensation resistor.
Feedback compensation resistor.
Pull-up resistor.
Feedback resistor divider.
Feedback resistor divider.
Classification resistor.
Schottky diode; part no. PN PDS1040.
Snubber diode (1N4148)
Snubber diode (DFLT15A)
Coilcraft part number FA2672 (5 V).
D1
R5
R4
C4
Notes
R6
R7
C3