background image

User's Guide

SLVUA27A – January 2014 – Revised March 2014

TPS23753AEVM-235 Evaluation Module

This user’s guide describes the TPS23753A evaluation module (EVM) (TPS23753AEVM-235). The
TPS23753AEVM-235 contains evaluation and reference circuitry for the TPS23753A device. The
TPS23753A device is an IEEE 802.3-2005 compliant, powered-device (PD) controller and power supply
controller optimized for isolated converter topologies. TPS23753AEVM-235 is targeted at a high efficiency
10-W PD solution.

Contents

1

Introduction

...................................................................................................................

2

1.1

Features

..............................................................................................................

2

1.2

Applications

..........................................................................................................

2

2

Electrical Specifications

.....................................................................................................

2

3

Description

....................................................................................................................

3

4

Schematic

.....................................................................................................................

4

5

General Configuration and Description

...................................................................................

5

5.1

Physical Access

.....................................................................................................

5

5.2

Test Setup

...........................................................................................................

5

6

TPS23753AEVM-235 Performance Data

.................................................................................

6

6.1

Startup

................................................................................................................

6

6.2

Transient Response

................................................................................................

6

6.3

Efficiency

.............................................................................................................

7

7

EVM Assembly Drawings and Layout Guidelines

.......................................................................

8

7.1

PCB Drawings

.......................................................................................................

8

7.2

Layout Guidelines

.................................................................................................

11

7.3

EMI Containment

..................................................................................................

12

8

Bill of Materials

.............................................................................................................

13

List of Figures

1

TPS23753AEVM-235 Schematic

..........................................................................................

4

2

Typical TPS23753AEVM-235 Test Setup

................................................................................

5

3

Startup Response to Full Load (2 A) for a 48-V Input

..................................................................

6

4

Transient Response from 1 to 2 A for a 48-V Input

.....................................................................

6

5

Efficiency of the TPS23753AEVM-235

....................................................................................

7

6

Top-Side Component Placement

..........................................................................................

8

7

Top-Side Routing

............................................................................................................

8

8

Layer 2 Routing

..............................................................................................................

9

9

Layer 3 Routing

..............................................................................................................

9

10

Bottom-Side Routing

.......................................................................................................

10

11

Bottom Component Placement

...........................................................................................

10

List of Tables

1

TPS23753AEVM-235 Electrical and Performance Specifications at 25°C

...........................................

2

2

Connector Functionality

.....................................................................................................

5

3

Test Points

....................................................................................................................

5

4

TPS23753AEVM-235 BOM

..............................................................................................

13

1

SLVUA27A – January 2014 – Revised March 2014

TPS23753AEVM-235 Evaluation Module

Submit Documentation Feedback

Copyright © 2014, Texas Instruments Incorporated

Summary of Contents for TPS23753AEVM-235

Page 1: ...ormance Data 6 6 1 Startup 6 6 2 Transient Response 6 6 3 Efficiency 7 7 EVM Assembly Drawings and Layout Guidelines 8 7 1 PCB Drawings 8 7 2 Layout Guidelines 11 7 3 EMI Containment 12 8 Bill of Materials 13 List of Figures 1 TPS23753AEVM 235 Schematic 4 2 Typical TPS23753AEVM 235 Test Setup 5 3 Startup Response to Full Load 2 A for a 48 V Input 6 4 Transient Response from 1 to 2 A for a 48 V Inp...

Page 2: ...nput voltage Applied to the power pins of connectors J2 or J4 0 57 V Rising input voltage 36 Input UVLO POE input J2 V Falling input voltage 30 Detection voltage At device terminals 3 10 V Classification voltage At device terminals 10 23 V Classification current RCLASS 90 9 Ω 26 5 29 3 mA Inrush current limit 100 180 mA Operating current limit 405 505 mA DC TO DC CONVERTER Output voltage VIN 48 V ...

Page 3: ...uitry is shown in Figure 1 R15 provides the detection signature and R25 provides the classification class 3 signature The switched side of the PD controller is to the right of U2 The TPS23753A RTN pin provides inrush limited turn on and charge of the bulk capacitor C13 The DC to DC converter is a high efficiency synchronous flyback converter The primary Q4 switching MOSFET is driven from U2 GATE p...

Page 4: ...F 2 kV 1 2 3 4 5 6 Q4 FDC86244 D14 BAT54S D13 MMSD4148 C11 0 1 F µ C18 1000 pF R15 24 9 kΩ C26 1 F µ 10 V C10 1 F µ 10 V GRN ORN YEL J1 J3 J2 J6 J5 J4 J7 J8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 J1 7499511611A 1 2 J4 1 2 J3 TP3 3 4 2 5 1 10 7 6 T1 NA6223 AL R11 10 Ω C12 1000 pF R10 10 Ω C7 100 F µ 6 3 V D9 MBR0530 D10 15 V D11 15 V C8 100 F µ 6 3 V C9 100 F µ 6 3 V 4 1 2 3 5 Q3 ...

Page 5: ...h connect to downstream Ethernet device J3 Output Output connector to load DC to DC converter input bypassing the PoE frontend connect a 34 V to 57 V DC power J4 DCDC Input supply if there is no J1 connection to power the converter Table 3 Test Points Test Point Color Label Description TP3 RED Output Load Voltage taken directly at the load TP1 RED Output Load Voltage taken directly at the output c...

Page 6: ...igure 3 Startup Response to Full Load 2 A for a 48 V Input 6 2 Transient Response Figure 4 shows the transient response of the TPS23753AEVM 235 Figure 4 Transient Response from 1 to 2 A for a 48 V Input 6 TPS23753AEVM 235 Evaluation Module SLVUA27A January 2014 Revised March 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 7: ...S23753AEVM 235 Performance Data 6 3 Efficiency Figure 5 shows the efficiency of the TPS23753AEVM 235 Figure 5 Efficiency of the TPS23753AEVM 235 7 SLVUA27A January 2014 Revised March 2014 TPS23753AEVM 235 Evaluation Module Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 8: ...ngs and Layout Guidelines www ti com 7 EVM Assembly Drawings and Layout Guidelines 7 1 PCB Drawings Figure 6 to Figure 11 show the component placement and layout of the TPS23753AEVM 235 Figure 6 Top Side Component Placement Figure 7 Top Side Routing 8 TPS23753AEVM 235 Evaluation Module SLVUA27A January 2014 Revised March 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorpora...

Page 9: ...ings and Layout Guidelines Figure 8 Layer 2 Routing Figure 9 Layer 3 Routing 9 SLVUA27A January 2014 Revised March 2014 TPS23753AEVM 235 Evaluation Module Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 10: ... R1 R6 R2 C2 C1 R3 R8 R4 C4 C3 Q2 R19 EVM Assembly Drawings and Layout Guidelines www ti com Figure 10 Bottom Side Routing Figure 11 Bottom Component Placement 10 TPS23753AEVM 235 Evaluation Module SLVUA27A January 2014 Revised March 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 11: ...the PoE side may operate without a ground plane the converter side must have one Do not place logic ground and power layers under the Ethernet input or the converter primary side Use large copper fills and traces on SMT power dissipating devices and use wide traces or overlay copper fills in the power path The DC to DC converter layout benefits from basic rules such as Pair signals to reduce emiss...

Page 12: ...ob Smith plane as a ground shield on input side of PCB creating a phantom or literal earth ground Use LC filter at DC to DC input Dampen high frequency ringing on all switching nodes if present allow for possible snubbers Control rise times with gate drive resistors and possibly snubbers Switching frequency considerations Use of EMI bridge capacitor across isolation boundary isolated topologies Ob...

Page 13: ...itor Aluminum 16V 20 4x5 8mm EEEFK1C220UR Panasonic 1 J1 7499511611A Connector RJ45 PoE Enabled 0 670 x 1 300 7499511611A WE 10 100 1000 BaseT inch 1 J2 55520252 4 Connector Jack Modular 8 POS 0 705 x 0 820 5520252 4 AMP 1 D14 BAT54S Diode Dual Schottky 200 mA 30 V SOT23 BAT54S Zetex 1 D13 MMSD4148 Diode Switching 100V 200mA 400mW SOD 123 MMSD4148G On Semi 2 D10 D11 15V Diode Zener 15V 500mW SOD12...

Page 14: ...11 10 Resistor Chip 1 10W 5 805 CRCW080510R0JNEA Vishay 1 R16 20 Resistor Chip 1 10W 5 805 CRCW080520R0JNEA Vishay 1 R13 39K Resistor Chip 1 10W 5 805 CRCW080539K0JNEA Vishay 1 R27 0 5 Resistor Chip 1 4W 1 1206 CSR1206FKR500 Stackpole 1 J3 ED555 2DS Terminal Block 2 pin 6 A 3 5mm 0 27 x 0 25 ED555 2DS OST inch 1 U1 TLV431AIDBVR IC Precision Adjustable Shunt Regulator SOT23 5 TLV431AIDBVR TI 2 TP1 ...

Page 15: ...to A Revision Page Changed the Bill of Materials 13 NOTE Page numbers for previous revisions may differ from page numbers in the current version 15 SLVUA27A January 2014 Revised March 2014 Revision History Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 16: ...ndling and use of EVMs and if applicable compliance in all respects with such laws and regulations 10 User has sole responsibility to ensure the safety of any activities to be conducted by it and its employees affiliates contractors or designees with respect to handling and using EVMs Further user is responsible to ensure that any interfaces electronic and or mechanical between EVMs and any human ...

Page 17: ...This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at its own expense FCC Interference Statement ...

Page 18: ...érieur au gain maximal indiqué sont strictement interdits pour l exploitation de l émetteur Mailing Address Texas Instruments Post Office Box 655303 Dallas Texas 75265 Copyright 2014 Texas Instruments Incorporated spacer Important Notice for Users of EVMs Considered Radio Frequency Products in Japan EVMs entering Japan are NOT certified by TI as conforming to Technical Regulations of Radio Law of ...

Page 19: ...esponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

Reviews: