Texas Instruments TPS2378EVM-602 Manual de usuario

SLVUAG7A–May 2015–Revised July 2017

TPS2378EVM-602 Evaluation Module

User's Guide

SLVUAG7A–May 2015–Revised July 2017

TPS2378EVM-602 Evaluation Module

This user’s guide describes the TPS2378 evaluation module (TPS2378EVM-602). TPS2378EVM-602

contains evaluation and reference circuitry for a forced four-pair UPOE compliant application.

Contents

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

2 Electrical Specifications .................................................................................................... 2

3 Description ................................................................................................................... 2

4 Schematic..................................................................................................................... 3

5 General Configuration and Description .................................................................................. 6

6 TPS2378EVM-602 Performance Data.................................................................................... 8

7 EVM Assembly Drawing and Layout Guidelines ...................................................................... 10

8 Bill of Materials ............................................................................................................. 15

List of Figures

1 TPS2378EVM-602 PD Front-End Schematic ........................................................................... 3

2 TPS2378EVM-602 Dual PD section ...................................................................................... 4

3 TPS2378EVM-602 DCDC Converter Section ........................................................................... 5

4 Typical TPS2378EVM-602 Test Setup ................................................................................... 7

5 Startup Response to 26-W Load for a 48-V Input....................................................................... 8

6 Transient Response from 290 mA to 2.9 A for a 48-V Input........................................................... 8

7 Efficiency of the TPS2378EVM-602....................................................................................... 9

8 Top Side Component Placement ........................................................................................ 10

9 Top Side Routing........................................................................................................... 10

10 Layer 2 Routing............................................................................................................. 11

11 Layer 3 Routing............................................................................................................. 11

12 Bottom Side Routing....................................................................................................... 12

13 Bottom Component Placement .......................................................................................... 12

List of Tables

1 TPS2378EVM-602 Electrical and Performance Specifications at 25°C.............................................. 2

2 Connector Functionality .................................................................................................... 6

3 Test Points ................................................................................................................... 6

4 TPS2378EVM-602 BOM .................................................................................................. 15

Trademarks

All trademarks are the property of their respective owners.

Introduction

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TPS2378EVM-602 Evaluation Module

1 Introduction

The TPS2378EVM-602 allows reference circuitry evaluation of a dual TPS2378 forced four pair UPOE

compliant application. It contains input and output power connectors and an array of onboard test points

for circuit and evaluation.

1.1 Features

• Excellent efficiency, driven, synchronous flyback design.

• Forced four-pair UPOE compliant

• 19 V at 2.3 A DC output (2.9-A capable)

1.2 Applications

• Universal power over ethernet (UPOE) compliant devices

• Video and VoIP telephones

• Multiband access points

• Security cameras

• Pico-base stations

2 Electrical Specifications

(1) Per TPS2378 PD

Table 1. TPS2378EVM-602 Electrical and Performance Specifications at 25°C

Parameter Condition MIN TYP MAX Unit

Power Interface

Input Voltage Applied to the power pins of connectors J1 or J3 42.5 57

Operating Voltage(1) After start up. 30 57

Input UVLO, POE input J1(1) Rising input voltage 40

Falling input voltage 30

Detection voltage(1) at device terminals 1.4 10.1

Classification voltage(1) at device terminals 11.9 23.0

Classification current(1) Rclass = 63.4 Ω38 42

mAInrush current-limit(1) 100 180

Operating current-limit(1) 850 1200

DC/DC Converter

Output Voltage 42.5 ≤VIN ≤57 V, ILOAD ≤ILOAD (max) 19-V output 19.01 19.04 19.07 V

Output Current 42.5 ≤VIN ≤57 V 19-V output 2.9 A

Output ripple voltage, pk-to-pk VIN = 48 V, ILOAD = 2.9 A 19-V output 225 mV

Efficiency, dc-dc converter VIN = 48 V, ILOAD = 2.9 A 93%

Efficiency, end- to-end VIN = 48 V, ILOAD = 2.9 A 19-V output 90%

Switching frequency 225 270 kHz

3 Description

TPS2378EVM-602 enables full evaluation of a forced four pair UPOE compliant application. A detailed

discussion regarding this type of high power PoE can be found in SLVA625.

The TPS23861EVM-612 contains two high power ports in which either one can be connected to the

TPS2378EVM-602 with a CAT5E cable to power the EVM. This is described in Section 5.2.

POE INPUT ETHERNET DATA

42.5-57VDC

CHGND

0.01µF

C26

0.01µF

C27

0.01µF

C28

0.01µF

C29

75.0

R32

75.0

R33

75.0

R34

75.0

R35

75.0

R28

75.0

R29

75.0

R30

75.0

R31

1000pF

C25

1000pF

C32

1000pF

C30

1000pF

C31

100 ohm

PAIR12

PAIR36

PAIR45

PAIR78

CHGND

D8 D9

D10 D11

D12 D13

D14 D15

DNP

J10

DNP

~BRG1

~BRG2

+BRG1

-BRG1

+BRG2

-BRG2

TP16

TP12

TP13

TP14

TP15

VSS2

VSS1

VDD

1:1

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Schematic

SLVUAG7A–May 2015–Revised July 2017

TPS2378EVM-602 Evaluation Module

4 Schematic

Figure 1. TPS2378EVM-602 PD Front-End Schematic

UPOE

OUTPUT

60W MAX

T2P1+

T2P1-

T2P2+

T2P2-

PWRGND

0.1µF

C34

0.1µF

C36

24.9k

R55

24.9k

R49

63.4

R52

63.4

R44

100k

R41

100k

R56

100k

R40

100k

R48

10.0k

R39

10.0k

R38

0.01µF

C37

0.01µF

C38

BAT46W -7-F

D21

BAT46W -7-F

D22

47µF

C35

47µF

C33

VDD

DEN

CLS

VSS

4RTN 5

CDB 6

T2P 7

APD 8

PWPD

TPS237 8DDA

VDD

DEN

CLS

VSS

4RTN 5

CDB 6

T2P 7

APD 8

PWPD

TPS237 8DDA

FOD817DS

58V

SMAJ58A

D17

BSS12 3

58V

SMAJ58A

D19

7,8 1,2,3

5,6,

FDMS86105

7,8 1,2,3

5,6,

FDMS86105

R43

DNP

BAT46W -7-F

D20

30.1k

R42

20.0k

R50

DNP

VBIAS

PGND

LO E6SF-ABCB-24-1-Z

D16

VOUT

PGND

LO E6SF-ABCB-24-1-Z

D18

49.9k

R46

10.0k

R47

VBIAS

VOUT

49.9k

R53

VOUT

T2P-VPU1

MMBT555 0LT1G

Q5 1

HMHA280 1A

8.87k

R45

78.7k

R51

VOUT

PGNDPWRGND

5.6k

R37

5.6k

R36

VOUT

T2P-VPU2

12.1k

R57

33.2k

R58

10.0k

R54

TP18

TP17

VDD

VSS1

TP19

VSS2

RTN1

RTN2

VSS1

VSS2

VDD

100

R59

DNP

VBIAS

Schematic

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Figure 2. TPS2378EVM-602 Dual PD section

SPGND

19V/2.9A

PGND

PWRGND

PGND

PWRGND

PGND

0.1µF

200k

R24

10.0k

R18

10.0k

R19

10.0k

R11

R14

2.2µF

39k

MURA120 T3G

2200pF

4.7

MMSD414 8T1G

7,8

1,2,3

5,6,

FDMS86252

MMBT390 6

0.1

1.00k

100pF

C13

20.0

BAT54S -7-F

1µF

C11

1µF

C23

0.047µF

C21

10µF

C10 68µF

C7 J1

470pF

C12

0.47µF

C15

0.47µF

C16

47pF

C19

20.0

3.83k

R17

49.9k

R23

2200pF

C17

1 4

8 5

PA0184NLT

22µF

C14

7,8

1,2,3

5,6,

FDMS86105

7.5k

R26

PWRGND

121k

R12

1µF

C22

0.039µF

C24

VIN

RTDEL

RON

ROFF

VREF 6

SYNC

GND 8

CS 9

RSLOPE

10 FB 11

SS/SD

PGND 13

AUX 14

OUT 15

PVDD

VDD

LINEUV 18

LINEOV 19

UCC2897APW

0.01µF

C18

80.6k

R16

61.9k

R20

100k

R21

1µF

C20

2.61k

R10

4.22k

R13

7.50k

R15

VBIAS

VOUT

LY E6SF-AABA-46-1-Z

PGND

10.0k

HMHA280 1A

LPS4018-332MLB

1NC

TL431AIDBV

7,8

1,2,3

5,6,

Q10

CSD1850 4Q5A

J11

Load Delay Disable

25.5k

R62

25.5k

R63

0.1µF

C40

2.2µF

C39

1.43k

R61

47.5k

R60

RESET 1

CT 3

SENSE

VCC

7NC

GND 5

TL7700CDGKR

PGND

VOUT

Optional Load Delay Circuit

0.1µF

C41

TP4

TP11

PGND

TP21

SPGND

TP7

PWRGND

TP2

PWRGND

TP10

VREF

6.81k

R25

2.00k

R27

1.21M

R22

TP8

VBIAS

TP5

OUT

TP6

TP3

DRAIN

TP9

LOOP

TP1

VOUT

TP20

RL_INHBT

VDD

RL_INHBT

PWRGND

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Schematic

SLVUAG7A–May 2015–Revised July 2017

TPS2378EVM-602 Evaluation Module

Figure 3. TPS2378EVM-602 DCDC Converter Section

General Configuration and Description

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TPS2378EVM-602 Evaluation Module

5 General Configuration and Description

5.1 Physical Access

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

the jumper functionality.

Table 2. Connector Functionality

Connector Label Description

J1 VOUT 19-V output voltage of the DCDC converter

J2 LED output ON signal

J3 PWR+DATA PoE input. Connect to PSE power and data source.

J4 DATA Ethernet data passthrough. Connect to downstream Ethernet device

J5 T2P-VPU1 T2P Pull up voltage of PD1

J6 T2P T2P output signals for both TPS2378 PDs

J7 T2P-VPU2 T2P Pull up voltage of PD2

J11 Load Delay Disable Disables load delay

Table 3. Test Points

Test Points Label Description

TP1 Output Output voltage

TP2, TP7 PWRGND Primary Ground

TP3 DRAIN Primary FET drain voltage

TP4 PGND Secondary Ground

TP5 OUT Primary FET gate voltage

TP6 CS Current sense voltage

TP8 VBIAS Aux bias voltage

TP9 LOOP AC Injector point for measuring loop response

TP10 VREF Reference voltage

TP11 FB Opto Feedback voltage

TP12 PAIR12 Voltage on pairs 1 and 2 of the Ethernet cable

TP13 PAIR36 Voltage on pairs 3 and 6 of the Ethernet cable

TP14 PAIR45 Voltage on pairs 4 and 5 of the Ethernet cable

TP15 PAIR78 Voltage on pairs 7 and 8 of the Ethernet cable

TP16 CHGND Chassis ground

TP17 VDD Chassis ground

TP18 VSS1 VSS1 pin of PD1

TP19 VSS2 VSS2 pin of PD2

TP20 RL_INHBT Gate voltage of load delay FET

TP21 SPGND Load ground

TPS2378EVM-602

PSE Ethernet Cable

VOUT

GND

Ethernet

Device

TPS23861EVM-612

J9 or J21

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General Configuration and Description

SLVUAG7A–May 2015–Revised July 2017

TPS2378EVM-602 Evaluation Module

5.2 Test Setup

Figure 4 shows the typical test set for the TPS2378EVM-602 using the TPS23861EVM-612.

1. Power the TPS23861EVM-612 as described in SLUUAY8.

2. Connect J3 of the TPS2378EVM-602 to J9 or J21 of the TPS23861EVM-612 using a standard CAT5E

cable.

3. Vary the load as necessary for test purposes.

Figure 4. Typical TPS2378EVM-602 Test Setup

5.2.1 Testing the TPS2378EVM-602 without a PSE

The TPS2378EVM-602 can be evaluated without a PSE and only a power supply.

1. Set the power supply between 42.5 V – 57 V Turn off the power supply

2. Short TP15 to TP13

3. Short TP14 to TP12

4. Connect the positive lead of the power supply to TP15

5. Connect the return lead of the power supply to TP14

6. Turn on the power supply

7. Vary the input voltage and output load as necessary for test purposes

2 ms/div

500 mV/div

1 A/div

50 ms/div

20 V/div

200 mA/div

TPS2378EVM-602 Performance Data

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6 TPS2378EVM-602 Performance Data

6.1 Startup

Figure 5 illustrates the startup response of the TPS2378EVM-602 (Ch2-VOUT) with 26-W output load.

Ch1 and Ch4 show the input current of each TPS2378 PD when the TPS23861EVM-612 is connected to

the EVM. It shows Type 2 hardware classification and subsequent inrush before starting up and sharing

current.

Figure 5. Startup Response to 26-W Load for a 48-V Input

6.2 Transient Response

Figure 6 illustrates the transient response of the TPS2378EVM-602.

Figure 6. Transient Response from 290 mA to 2.9 A for a 48-V Input

Output Current (A)

Efficiency

0 0.5 1 1.5 2 2.5 3

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

D001

PoE

Converter

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TPS2378EVM-602 Performance Data

SLVUAG7A–May 2015–Revised July 2017

TPS2378EVM-602 Evaluation Module

6.3 Efficiency

Figure 7 illustrates the efficiency of the TPS2378EVM-602.

Figure 7. Efficiency of the TPS2378EVM-602

6.4 Startup to Resistive Overload with TPS23861EVM-612

The IEEE802.3at standard requires the PD to startup with less than 13 W (per pair) for 80 ms during PSE

inrush. When using the TPS2378EVM-602 EVM with the TPS23861EVM-612 for evaluation while using

resistive loads, the output load must be light enough (< 1 A) at startup to meet this requirement. When the

output is operational, the load can be further increased to nominal 2.3A.

For startup to higher loads (> 1 A) the TPS2378EVM-602 contains an optional load delay circuit (shown in

Figure 3) that delays connecting the resistive load while the PSE finishes inrush.

The load delay circuit is for evaluation only of the EVM using resistive loads. In final system PD designs, it

is the load’s task to accommodate the PSEs inrush time.

To disable the load delay circuit, shunt J11.

EVM Assembly Drawing and Layout Guidelines

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7 EVM Assembly Drawing and Layout Guidelines

7.1 PCB Drawings

Figure 8 to Figure 13 show component placement and layout of the TPS2378EVM-602.

Figure 8. Top Side Component Placement

space

Figure 9. Top Side Routing

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