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General Configuration and Description

5 General Configuration and Description

5.1 Physical Access

Table 2 lists the TPS2378EVM connector functionality, Table 3 describes the test point availability and

Table 4 describes the jumper functionality.

Table 2. Connector Functionality

Connector Label Description

Power over ethernet (POE) input. Connect to power sourcing equipment (PSE) power and data

J1 PWR+DATA

source.

J2 DATA Ethernet data pass through. Connect to downstream ethernet device.

DC adapter input. Connect to dc power supply. DC voltage above 38V will disable the TPS2378

J3 ADAPTER

internal MOSFET and activate the T2P LED.

Output connector to load. Connect pin #4 (VDD) to positive input and pin #1 (RTN) to low side of

J6 J6 load. Pin #2 (CDB) can be used to inhibit the converter while the TPS2378 output is ramping up. Pin

#3 (T2P) can be used to notify the load of when high power source is present.

T2P (type 2 PSE) LED. When ON this indicates that either a type 2 PSE is detected or an adapter

D2 (RED) T2P

voltage source (above 38V) is present at J3.

D3 (GREEN) ON TPS2378 Output Powered.

Table 3. Test Points

Test Point Color Label Description

TP1 WHT APD Auxiliar power detect

TP2 RED PAIR12 Data pair from pins 1 and 2 of J1

TP3 ORG PAIR36 Data pair from pins 3 and 6 of J1

TP4 RED PAIR45 Spare pair from pins 4 and 5 of J1

TP5 ORG PAIR78 Spare pair from pins 7 and 8 of J1

TP6 RED VDD High side output from bridge

TP7 WHT T2P Type 2 PSE output from TPS2378

TP8 BLK RTN Switched low side from TPS2378

TP9 WHT CDB Converter disable output from TPS2378

TP10 BLK VSS Low side output from bridge

TP11 SM EGND Earth or chassis ground point

Table 4. Jumpers

Jumper Label Description

J4 J4 LED bias jumper. Install to furnish LED bias for T2P and ON LED’s

J5 J5 Switched output return bypass jumper.

5.2 Test Setup

Figure 2 shows a typical test setup for TPS2378EVM. Connect J1 to the power sourcing equipment (PSE)

or alternatively connect J3 to a wall adapter or power supply. Power for the Ethernet device is available at

J6 and the pass through Ethernet data is available at J2.

SLVU682–March 2012 TPS2378 EVM User’s Guide

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