Texas Instruments TPS2378 Manuale utente

User's Guide

SLVU682–March 2012

TPS2378 EVM User’s Guide

This User’s Guide describes the evaluation module (EVM) for the TPS2378 (TPS2378EVM-105).

TPS2378 is an IEEE802.3at type 2 compliant powered device (PD) controller.

Contents

1 Introduction .................................................................................................................. 2

1.1 Features ............................................................................................................. 2

1.2 Applications ......................................................................................................... 2

2 Electrical Specifications at 25°C .......................................................................................... 2

3 Description ................................................................................................................... 3

4 Schematic .................................................................................................................... 4

5 General Configuration and Description .................................................................................. 5

5.1 Physical Access .................................................................................................... 5

5.2 Test Setup .......................................................................................................... 5

6 EVM Assembly Drawings and Layout Guidelines ...................................................................... 6

6.1 PC Drawings ........................................................................................................ 6

6.2 Layout Guidelines .................................................................................................. 9

6.3 EMI Containment ................................................................................................... 9

7 Bill of Materials ............................................................................................................. 10

List of Figures

1 TPS2378EVM Schematic.................................................................................................. 4

2 Typical TPS2378EVM Test Setup ........................................................................................ 6

3 Top Side Placement........................................................................................................ 6

4 Top Side Routing ........................................................................................................... 7

5 Layer Two Routing.......................................................................................................... 7

6 Layer Three Routing........................................................................................................ 8

7 Bottom Side Routing........................................................................................................ 8

8 Bottom Side Placement .................................................................................................... 9

List of Tables

1 TPS2378EVM Electrical and Performance Specifications............................................................. 2

2 Connector Functionality.................................................................................................... 5

3 Test Points................................................................................................................... 5

4 Jumpers ...................................................................................................................... 5

5 TPS2378EVM Bill of Materials .......................................................................................... 10

SLVU682–March 2012 TPS2378 EVM User’s Guide

Introduction

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1 Introduction

The TPS2378EVM allows reference circuit evaluation of the TI TPS2378 PD controller. The TPS2378

features an auxiliary power detect (APD) input, providing priority for an external power adapter. It also

features a 100 V pass transistor, 140 mA inrush current limiting, type-2 indication, auto-retry fault

protection, and an open-drain power-good output.

1.1 Features

• Gigabit Ethernet pass through interface

• Switched output return for “ease of use” loading

• Adapter input capability

• IEEE 802.3at type-2 hardware classification with status flag (T2P) and LED

• DC/DC converter enable (CDB)

• Robust 100 V, 0.5 Ωhotswap MOSFET

• Operating current up to 1A typical

1.2 Applications

• IEEE 802.3at-compliant devices

• Video and VoIP telephones

• Multiband access points

• Security cameras

• Pico-base stations

2 Electrical Specifications at 25°C

Table 1. TPS2378EVM Electrical and Performance Specifications

PARAMETER CONDITION MIN TYP MAX UNITS

POWER INTERFACE

Input Voltage Applied to the power pins of connectors J1 or J3 0 – 57 V

Operating Voltage After start up. 30 – 57 V

Rising input voltage at device terminals. – – 40

Input UVLO V

Falling input voltage. 30.5 – –

Detection voltage At device terminals 1.4 – 10.1 V

Classification voltage At device terminals 11.9 – 23.0 V

Classification current Rclass = 63.4 Ω38 – 42 mA

Inrush current-limit 100 – 180 mA

Operating current-limit 850 – 1200 mA

Two input pairs:

Efficiency 97.4%

Measured from J1 to J6 with J5 shorted. 31W output power

2TPS2378 EVM User’s Guide SLVU682–March 2012

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Description

3 Description

TPS2378EVM-105 enables full evaluation of the TPS2378 device. Refer to the schematic shown in

Figure 1. Ethernet power is applied from J1 to T1 and is dropped to the diode bridges (D4/D5/D10/D11 or

D6/D7/D12/D13) from the T1 center taps. The series R-C circuit from each center tap help balance the

Ethernet cable impedance and are critical for ESD and EMI/EMC performance. These circuits are

terminated at TP11 (EGND) through the high voltage capacitor, C11. At the output of the diode bridges is

the EMI/EMC filter and transient protection for the TPS2378. R9 provides the detection signature and R15

provides the class 4 signature resistance to the PSE.

To the right of the TPS2378 (U1) is the switched side of the PD controller. The TPS2378 RTN pin

provides inrush limited turn on and charge of the bulk capacitor, C4. During inrush, the TPS2378 CDB pin

is pulled low (with respect to the RTN pin). Since the CDB pin is connected to the GATE of Q1, Q1 is off

during inrush and J6 pin 1 is not connected to the RTN pin. This allows the output load to remain

connected during EVM testing.

Input power can also be applied at J3 from a dc source. EMI/EMC filtering is provided at this connector as

well and diode D1 ensures reverse voltage protection. R4 and R7 provide a threshold for the TPS2378

APD pin so that the TPS2378 internal MOSFET is disabled when the voltage at J3 is above approximately

38V. This ensures that the adapter has priority over the PSE source. LED’s D2 and D3 provide operational

visual indications of T2P and ON respectively.

SLVU682–March 2012 TPS2378 EVM User’s Guide

PAIR36

PAIR78

PAIR45

PAIR12

VSS

VDD

APD

T2P

CDB

RTN

(ON)

(T2P)

CDB

RTN

T2P

VDD

LED BIAS

SWITCHED

OUTPUT

+48V, 1A

ADAPTER

INPUT

+33-57V, 1A

POE INPUT ETHERNET DATA

EGND

2a 2b

NOTES

1NOT USED

a. Use for switched RTN

b. Use to "OR" second TPS2378

1VDD

2DEN

3CLS

4VSS 5

RTN

CDB

T2P

APD

9PWPD

TPS2378DDA

R15

63.4

FB3 500

B2100

SMAJ58A

1000pF

24.9k

C10

0.1uF

C11

1000pF

R10

0.01uF

R11

0.01uF

R12

0.01uF

R13

0.01uF

D10

B2100

D11

B2100

D12

B2100

D13

B2100

FB4 500

+C4

47uF

12.1k

LN1271RAL

LN1371G

12.1k

FB1 500 D1 B2100

1000pF

0.1uF

237k

10k

R3 75

R5 75

R2 75

R1 75

R14 100k

TP6

TP10

TP1

TP2

TP4

TP3

TP5

TP7

TP9

TP8

FB2 500

0.01uF

IRFL4310

D14

BZT52C18V D9

B2100

C12

1000pF

TP11

Schematic

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4 Schematic

Figure 1. TPS2378EVM Schematic

4TPS2378 EVM User’s Guide SLVU682–March 2012

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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

PSE

Ethernet

Device

DUT

TPS2378EVM

J1 J2

VDD

SRTN

- +

(Ethernet Cable)

Wall Adapter

T2P

CDB

EVM Assembly Drawings and Layout Guidelines

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Figure 2. Typical TPS2378EVM Test Setup

6 EVM Assembly Drawings and Layout Guidelines

6.1 PC Drawings

The following figures show component placement and layout of the EVM.

Figure 3. Top Side Placement

6TPS2378 EVM User’s Guide SLVU682–March 2012

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EVM Assembly Drawings and Layout Guidelines

Figure 4. Top Side Routing

Figure 5. Layer Two Routing

SLVU682–March 2012 TPS2378 EVM User’s Guide

EVM Assembly Drawings and Layout Guidelines

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Figure 6. Layer Three Routing

Figure 7. Bottom Side Routing

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EVM Assembly Drawings and Layout Guidelines

Figure 8. Bottom Side Placement

6.2 Layout Guidelines

The layout of the PoE front end should follow power and EMI/ESD best practice guidelines. A basic set of

recommendations include:

• Parts placement must be driven by power flow in a point-to-point manner; RJ-45, Ethernet transformer,

diode bridges, TVS and 0.1-µF capacitor, and TPS2378.

• All leads should be as short as possible with wide power traces and paired signal and return.

• There should not be any crossovers of signals from one part of the flow to another.

• Spacing consistent with safety standards like IEC60950 must be observed between the 48-V input

voltage rails and between the input and an isolated converter output.

• The TPS2378 should be located over split, local ground planes referenced to VSS for the PoE input

and to RTN for the switched output.

• Large copper fills and traces should be used on SMT power-dissipating devices, and wide traces or

overlay copper fills should be used in the power path.

6.3 EMI Containment

• Use compact loops for dv/dt and di/dt circuit paths (power loops and gate drives)

• Use minimal, yet thermally adequate, copper areas for heat sinking of components tied to switching

nodes (minimize exposed radiating surface).

• Use copper ground planes (possible stitching) and top layer copper floods (surround circuitry with

ground floods)

• Use 4 layer PCB if economically feasible (for better grounding)

• Minimize the amount of copper area associated with input traces (to minimize radiated pickup)

• Use Bob Smith terminations, Bob Smith EFT capacitor, and Bob Smith plane

• Use Bob Smith plane as ground shield on input side of PCB (creating a phantom or literal earth

ground)

• Use of ferrite beads on input (allow for possible use of beads or 0 ohm resistors)

• Maintain physical separation between input-related circuitry and power circuitry (use ferrite beads as

boundary line)

• Possible use of common-mode inductors

• Possible use of integrated RJ-45 jacks (shielded with internal transformer and Bob Smith terminations)

• End-product enclosure considerations (shielding)

SLVU682–March 2012 TPS2378 EVM User’s Guide

Bill of Materials

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7 Bill of Materials

Table 5. TPS2378EVM Bill of Materials

Count REFDES Value Description Size Part Number Supplier

4 FB1-4 500 Bead, Ferrite, 2000mA, 60m-ohm 1206 MI1206L501R-10 Steward

5 C3 C5-8 0.01uF Capacitor, Ceramic, 100V, X7R, 10% 603 STD STD

2 C1 C9 1000pF Capacitor, Ceramic, 100V, X7R, 10% 603 STD STD

2 C2 C10 0.1uF Capacitor, Ceramic, 100V, X7R, 10% 805 STD STD

2 C11-12 1000pF Capacitor, Ceramic, 2kV, X7R, 15% 1210 Std STD

1 C4 47uF Capacitor, Aluminum, 63V, ±20% 0.328 x 0.390 inch EEE-FK1J470P Panasonic

2 J1-2 5520252-4 Connector, Jack, Modular, 8 POS 0.705 x 0.820 inch 5520252-4 AMP

1 D14 BZT52C18V Diode, Zener, Planar Power, 500mW, 18V SOD-123 BZT52C18-7-F Diodes, Inc

1 D2 LN1271RAL Diode, LED, Ultra Bright Red, 10-mA, 5-mcd 0.114 X 0.049 inch LN1271RAL Panasonic

1 D3 LN1371G Diode, LED, Green, 10-mA, 2.6-mcd 0.114 X 0.049 inch LN1371G Panasonic

9 D1 D4-7 D10-13 B2100 Diode, Schottky, 2-A, 100-V SMB B2100-13-F Diodes, Inc

0 D9 B2100 Diode, Schottky, 2-A, 100-V SMB B2100-13-F Diodes, Inc

1 D8 SMAJ58A Diode, TVS, 58-V, 1W SMA SMAJ58A-13-F Diodes, Inc

2 J4 J5 PEC02SAAN Header, Male 2-pin, 100mil spacing 0.100 inch x 2 PEC02SAAN Sullins

1 R14 100k Resistor, Chip, 1/16W, 1% 603 STD STD

1 R7 10k Resistor, Chip, 1/16W, 1% 603 STD STD

1 R4 237k Resistor, Chip, 1/16W, 1% 603 STD STD

1 R9 24.9k Resistor, Chip, 1/16W, 1% 603 STD STD

8 R1-3 R5 R10-13 75 Resistor, Chip, 1/16W, 1% 603 STD STD

1 R15 63.4 Resistor, Chip, 1/10W, 1% 805 STD STD

2 R6 R8 12.1k Resistor, Chip, 0.6W, 1% 2010 STD STD

1 J6 ED120/4DS Terminal Block, 4-pin, 15-A, 5.1mm 0.80 x 0.35 inch ED120/4DS OST

1 J3 ED555/2DS Terminal Block, 2-pin, 6-A, 3.5mm 0.27 x 0.25 inch ED555/2DS OST

3 TP2 TP4 TP6 5010 Test Point, Red, Thru Hole 0.125 x 0.125 inch 5010 Keystone

2 TP8 TP10 5011 Test Point, Black, Thru Hole 0.125 x 0.125 inch 5011 Keystone

3 TP1 TP7 TP9 5012 Test Point, White, Thru Hole 0.125 x 0.125 inch 5012 Keystone

2 TP3 TP5 5013 Test Point, Orange, Thru Hole 0.125 x 0.125 inch 5013 Keystone

1 TP11 5016 Test Point, SM, 0.150 x 0.090 0.185 x 0.135 inch 5016 Keystone

1 U1 TPS2378DDA IC, IEEE 802.3at PoE High Power PD Controller TPS2378DDA TPS2378DDA TI

1 Q1 IRFL4310 MOSFET, N-ch, 100V, 200-milliOhms SOT223 IRFL4310TRPBF IRF

Wurth

749022011 749022011 Electronics

1 T1 or PoE Plus Gigabit Ethernet Transfomer S024 or or

H6096NL H6096NL Pulse

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