Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsDev KitsPCB design board

User's Guide

SLVU753–July 2012

TPS23752EVM-145: Evaluation Module for TPS23752

This User’s Guide describes the evaluation module (EVM) for the TPS23752 (TPS23752EVM-145). The

TPS23752 is a type 2, Power over Ethernet (PoE) powered device (PD) controller and integrated current-

mode DC/DC controller with sleep mode. The TPS23752 is optimized specifically for applications requiring

high efficiency over a wide load range.

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 .................................................................................. 6

5.1 Physical Access .................................................................................................... 6

5.2 Test Setup .......................................................................................................... 7

6 TPS23752EVM-145 Performance Data .................................................................................. 7

6.1 Efficiency ............................................................................................................ 7

7 EVM Assembly Drawings and Layout Guidelines ...................................................................... 9

7.1 PCB Drawings ...................................................................................................... 9

7.2 Layout Guidelines ................................................................................................ 12

7.3 EMI Containment ................................................................................................. 13

8 Bill of Materials ............................................................................................................. 14

List of Figures

1 TPS23752EVM-145 Schematic ........................................................................................... 4

2 TPS23752EVM-145 Schematic (2)....................................................................................... 5

3 Typical TPS23752EVM-145 Test Setup ................................................................................. 7

4 PoE End-End Efficiency.................................................................................................... 8

5 DC/DC Converter Efficiency............................................................................................... 8

6 DC/DC Converter Light-Load Efficiency ................................................................................. 8

7 Top-Side Placement ........................................................................................................ 9

8 Top-Side Routing ........................................................................................................... 9

9 Layer Two Routing ........................................................................................................ 10

10 Layer Three Routing ...................................................................................................... 10

11 Bottom-Side Routing ...................................................................................................... 11

12 Bottom-Side Placement................................................................................................... 11

List of Tables

1 TPS23752EVM-145 Electrical and Performance Specifications...................................................... 2

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

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

4 Jumpers ...................................................................................................................... 7

5 TPS23752EVM-145 Bill of Materials ................................................................................... 14

SLVU753–July 2012 TPS23752EVM-145: Evaluation Module for TPS23752

Submit Documentation Feedback

Summary of content (25 pages)

PAGE 1
User's Guide SLVU753 – July 2012 TPS23752EVM-145: Evaluation Module for TPS23752 This User’s Guide describes the evaluation module (EVM) for the TPS23752 (TPS23752EVM-145). The TPS23752 is a type 2, Power over Ethernet (PoE) powered device (PD) controller and integrated currentmode DC/DC controller with sleep mode. The TPS23752 is optimized specifically for applications requiring high efficiency over a wide load range. 1 2 3 4 5 6 7 8 Contents Introduction ............................................
PAGE 2
Introduction 1 www.ti.com Introduction This EVM allows reference circuitry evaluation of the TPS23752 PD controller, DC/DC controller, and sleep mode functionality. 1.1 Features • • • • • • • 1.
PAGE 3
Description www.ti.com 3 Description The EVM enables full evaluation of the TPS23752 device. Refer to the schematics shown in Figure 1 and Figure 2. Ethernet power is applied from J1 to T1 and is dropped to the diode bridges (D1/D2/D7/D8 or D3/D4/D9/D10) from the T1 center taps. The series R-C circuits from each center tap help balance the Ethernet cable impedance and are critical for ESD and EMI/EMC performance. These circuits are terminated at TP7 (EGND) through the high-voltage capacitor, C10.
PAGE 4
Schematic 4 www.ti.com Schematic T1 749022011 R1 24 J1 POE INPUT 75 1 J2 2 23 1 2 3 4 5 6 7 8 3 22 21 R2 75 R3 75 R4 75 4 5 20 ETHERNET DATA 1 2 3 4 5 6 7 8 6 19 18 7 8 17 9 16 15 10 11 14 12 13 PAIR12 TP1 C1 PAIR36 TP2 1000pF PAIR45 TP3 VDD TP5 PAIR78 TP4 FB1 500 C2 C3 0.01uF C4 D1 D2 D3 D4 B2100 B2100 B2100 B2100 VDD J3 C5 0.01uF 0.01uF 0.01uF R6 R7 R8 R9 75 75 75 75 C6 D6 C7 1000pF SMAJ58A 0.
PAGE 5
Schematic www.ti.com L1 3.3uH T2 JA4456-DL VDD VOUT 1 2 C15 0.1uF 100V TP9 R23 24.9K C16 47uF 63V C17 1uF 100V + C18 1uF 100V 1 VDD 2 DEN ON=Sleep or MODE low R26 LN1371G 63.4 0.1W R27 6.19K R28 34K APD 3 CLS 4 APD T2P 5 RT 6 T2P 250KHz TP14 D15 1N4148W R24 750K + GATE 17 VC 16 C29 1uF CS 15 VB 14 PWPD MODE SLPB 11 SLPB R35 16.9K VSS C30 0.1uF C32 0.47uF R36 Q4 MMBT2907A R39 0 R33 10K R34 0.09 0.5W 332 0.47uF R40 20K D18 8 R37 10K 5 R38 43.2 4 C34 0.
PAGE 6
General Configuration and Description www.ti.com 5 General Configuration and Description 5.1 Physical Access Table 2 lists the EVM connector functionality, Table 3 describes the test point availability, and Table 4 describes the jumper functionality. Table 2. Connector Functionality Connector Label Description J1 PWR + DATA Power over ethernet (POE) input. Connect to power-sourcing equipment (PSE) power and data source. J2 DATA Ethernet data pass through. Connect to downstream Ethernet device.
PAGE 7
TPS23752EVM-145 Performance Data www.ti.com Table 4. Jumpers 5.2 Jumper Label Description J4 J4 D11 LED bias jumper. Installing enables WAKE LED. J7 J5 D12 LED bias jumper. Installing enables T2P LED. Shunt may be removed when making efficiency measurements. J11 J11 D20 LED bias jumper. Installing enables OUTPUT LED. Shunt may be removed when making efficiency measurements. Test Setup Figure 3 shows a typical test setup for the EVM.
PAGE 8
TPS23752EVM-145 Performance Data www.ti.com 90 80 Efficiency (%) 70 60 50 40 30 20 10 0 0 1 2 3 Load Current (A) 4 5 G001 Figure 4. PoE End-End Efficiency 90 80 Efficiency (%) 70 60 50 40 30 20 PWM Mode Only PWM−>VFO Mode 10 0 0 1 2 3 Load Current (A) 4 5 G002 Figure 5. DC/DC Converter Efficiency 90 85 Efficiency (%) 80 75 70 65 60 55 50 PWM Mode Only PWM−>VFO Mode 45 40 0 0.2 0.4 0.6 Load Current (A) 0.8 1 G003 Figure 6.
PAGE 9
EVM Assembly Drawings and Layout Guidelines www.ti.com 7 EVM Assembly Drawings and Layout Guidelines 7.1 PCB Drawings Figure 7 through Figure 12 show component placement and layout. Figure 7. Top-Side Placement Figure 8.
PAGE 10
EVM Assembly Drawings and Layout Guidelines www.ti.com Figure 9. Layer Two Routing Figure 10.
PAGE 11
www.ti.com EVM Assembly Drawings and Layout Guidelines Figure 11. Bottom-Side Routing Figure 12.
PAGE 12
EVM Assembly Drawings and Layout Guidelines 7.2 www.ti.com Layout Guidelines Follow power and EMI/ESD best practice guidelines for the layout of the PoE front end. 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 TPS23752 converter input bulk capacitor. • Make all leads as short as possible with wide power traces and paired signal and return.
PAGE 13
EVM Assembly Drawings and Layout Guidelines www.ti.com 7.3 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).
PAGE 14
Bill of Materials 8 www.ti.com Bill of Materials Table 5. TPS23752EVM-145 Bill of Materials COUNT REFDES 14 VALUE DESCRIPTION SIZE PART NUMBER SUPPLIER 2 C1, C10 1000 pF Capacitor, ceramic, 2 kV, X7R, 15% 1210 Std STD 2 C12, C30 0.1 µF Capacitor, ceramic, 25 V, X7R, 10% 603 Std Std 5 C13-14, C32-34 0.47 µF Capacitor, ceramic, 16 V, X7R, 10% 603 STD Std 1 C16 47 µF Capacitor, Aluminum, 63 V, ±20% 0.328 × 0.
PAGE 15
Bill of Materials www.ti.com Table 5. TPS23752EVM-145 Bill of Materials (continued) COUNT REFDES VALUE DESCRIPTION SIZE PART NUMBER SUPPLIER 1 R10 8.87 kΩ Resistor, chip, 1/16W, 1% 603 STD STD 5 R11, R15, R18, R44, R50 1 kΩ Resistor, chip, 1/16W, 1% 603 STD Std 4 R12-14, R19 15 kΩ Resistor, chip, 1/16W, 1% 603 STD Std 8 R1-4, R6-9 75 Ω Resistor, chip, 1/16W, 1% 603 STD STD 2 R16, R20 1.
PAGE 16
Bill of Materials www.ti.com Table 5. TPS23752EVM-145 Bill of Materials (continued) COUNT REFDES VALUE DESCRIPTION SIZE PART NUMBER SUPPLIER 5 TP2, TP4, TP10, TP15-16 5013 Test point, orange, thru hole 0.125 × 0.125 in 5013 Keystone 3 TP6, TP9, TP13 5011 Test point, black, thru hole 0.125 × 0.125 in 5011 Keystone 1 TP7 5016 Test point, SM, 0.150 × 0.090 0.185 × 0.135 in 5016 Keystone 5 U1-4, U6 PC357N4J000F Photocoupler, 300-600% CTR, 3.
PAGE 17
EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
PAGE 18
FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
PAGE 19
【Important Notice for Users of this Product in Japan】】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
PAGE 20
EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
PAGE 21
EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
PAGE 22
FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
PAGE 23
【Important Notice for Users of this Product in Japan】】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
PAGE 24
EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
PAGE 25
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.