SI3402ISO-EVB Silicon Laboratories Inc, SI3402ISO-EVB Datasheet

SI3402ISO-EVB

Manufacturer Part Number

SI3402ISO-EVB

Description

BOARD EVAL POE ISOL FOR SI3402

Manufacturer

Silicon Laboratories Inc

Type

PWM Controllersr

Datasheet

1.SI3402ISO-EVB.pdf (16 pages)

Specifications of SI3402ISO-EVB

Main Purpose

Special Purpose DC/DC, Power Over Ethernet

Outputs And Type

1, Isolated

Voltage - Output

Voltage - Input

44 ~ 57V

Regulator Topology

Flyback

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

336-1828

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1. Description

The Si3402 isolated evaluation boards (Si3402 ISO-EVB Rev 1.0) is a reference design for power supplies in

Power over Ethernet (PoE) Powered Device (PD) applications. The Si3402 is described more completely in the

data sheet and application notes. This document describes only the Si3402 ISO-EVB evaluation board. An

evaluation board demonstrating the non-isolated application is described in the Si3402-EVB User’s Guide.

2. Planning for Successful Designs

Silicon Labs strongly recommends the use of the schematic and layout databases provided with the evaluation

boards as the starting point for your design. Use of external components other than those described and

recommended in this document is generally discouraged. Refer to Table 2 on page 10 for more information on

critical component specifications. Careful attention to the recommended layout guidelines is required to enable

robust designs and full specification compliance. To help ensure design success, please submit your schematic

and layout databases to PoEInfo@silabs.com for review and feedback.

3. Si3402 Board Interface

Ethernet data and power are applied to the board through the RJ-45 connector (J1). The board may be powered by

the following:



The board itself has no Ethernet data transmission functionality. The dc output is at connectors J11(+) and J12(–).

Boards are generally shipped configured to produce +5 V but can be configured for +3.3 V or other output voltages

as shown in Table 2 on page 10. The Si3402 board schematics and layout are shown in Figures 1 through 6. The

Si3402 ISO-EVB is normally populated for 5 V output class 3 signature and without the diode bridge bypass

recommended for higher power levels. Use the ordering option Si3402 ISO-C4-EVB for 5 V output, class 4

signature and diode bridge bypass for higher power levels.

The feedback loop compensation has been optimized for 3.3, 5, 9, and 12 V output as well as with standard and

low ESR capacitors in the output filter section (Table 2 on page 10). The use of low ESR capacitors is

recommended for lower output ripple, improved load transient response and low temperature (below 0 °C)

operation.

Rev. 1.1 6/10

SOLA TED

Connecting a dc source to 1, 2 and 3, 6 (either polarity)

Connecting a dc source to 4, 5 and 7, 8 (either polarity)

Using an 802.3af-compliant PSE, such as Phihong PSA16U-480 (PoE)

VALUATION

OAR D FOR TH E

Si3402 ISO- E VB

Si3402

Si3402 ISO-EVB

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