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SI3400-EVB 데이터시트(PDF) 1 Page - Silicon Laboratories |
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1 / 14 page Rev. 0.82 4/09 Copyright © 2009 by Silicon Laboratories Si3400/1/2-EVB Si3400/1/2-EVB N ON-I SOLATED E VALUATION B OARD FOR THE Si3400, Si3401, AND Si3402 1. Description The Si3400, Si3401, and Si3402 non-isolated evaluation board (Si3400/1/2-EVB Rev 1.41) are reference designs for a power supply in a Power over Ethernet (PoE) Powered Device (PD) application. The Si3400, Si3401, and Si3402 are described more completely in the data sheet and application notes. This document describes the evaluation board. An evaluation board demonstrating the isolated application is described in the Si3400/1/2ISO-EVB user’s guide. 2. Si3400/1/2 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: Connecting a dc source to 1, 2 and 3, 4 (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) The board itself has no Ethernet data transmission functionality, but, as a convenience, the Ethernet transformer secondary is brought out to the test points. The dc output is at connectors J4(+) and J3(–). Boards are generally shipped configured to produce +5 V but can be configured for +3.3 V or other output voltages by changing resistors R5 and R6. Refer to “AN296: Using the Si3400 and Si3401 PoE PD Controllers in Isolated and Non-Isolated Designs” and its accompanying Excel® spreadsheet utility for more information. The only other test point provided is J6, which is the power loss (PLOSS) indicator. 3. Schematics The Si3400/1/2-EVB board schematics and layers are shown in Figures 1 through 6. The evaluation boards for the Si3400, Si3401, and Si3402 are essentially identical. The only differences are that the diode bridges are bypassed (populated); the PD controller on the Si3401-EVB is the Si3401; and the PD controller on the Si3402-EVB is the Si3402. |
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