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SLUUBN2 – March 2017

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TPS549B22EVM-847, 25-A Single Synchronous Step-Down Converter With

Full Differential Sense and PMBus™

User's Guide

SLUUBN2 – March 2017

TPS549B22EVM-847, 25-A Single Synchronous Step-Down

Converter With Full Differential Sense and PMBus™

This user's guide describes the characteristics, operation, and use of the TPS549B22 Evaluation Module
(EVM). The user's guide includes test information, descriptions, and results. A complete schematic
diagram, printed-circuit board layouts, and bill of materials are also included in this document. Throughout
this user's guide, the abbreviations EVM, TPS549B22EVM, and the term evaluation module are
synonymous with the TPS549B22EVM-847, unless otherwise noted.

Contents

Introduction

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

1.1

Before You Begin

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

Description

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

2.1

Typical End-User Applications

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

2.2

EVM Features

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

EVM Electrical Performance Specifications

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

Schematic

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

Test Setup

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

5.1

Test and Configuration Software

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

Test Equipment

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

PWR-847EVM

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

List of Test Points, Jumpers, and Switch

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

EVM Configuration Using the Fusion GUI

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

Test Procedure

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

10.1

Line and Load Regulation Measurement Procedure

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

10.2

Efficiency

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

10.3

Equipment Shutdown

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

Performance Data and Typical Characteristic Curves

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

11.1

Efficiency

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

11.2

Load Regulation

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

11.3

Line Regulation

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

11.4

Transient Response

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

11.5

Output Ripple

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

11.6

Control On

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

11.7

Control Off

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

11.8

Thermal Image

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

Fusion GUI

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

EVM Assembly Drawing and PCB Layout

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

List of Materials

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

List of Figures

PWR-847EVM Schematic

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

PWR-847EVM Overview

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

Tip and Barrel Measurement

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

EVM and USB Interface Adapter

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

Efficiency vs Output Current SKIP Mode

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

Power Loss vs Output Current SKIP Mode

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

Summary of Contents for TPS549B22EVM-847

Page 1: ...uction 3 1 1 Before You Begin 3 2 Description 4 2 1 Typical End User Applications 4 2 2 EVM Features 4 3 EVM Electrical Performance Specifications 5 4 Schematic 6 5 Test Setup 7 5 1 Test and Configuration Software 7 6 Test Equipment 8 7 PWR 847EVM 9 8 List of Test Points Jumpers and Switch 11 9 EVM Configuration Using the Fusion GUI 12 10 Test Procedure 13 10 1 Line and Load Regulation Measurement...

Page 2: ...ow at Fusion Launch 22 21 Scan Finds Device Successfully 22 22 Software Launch Continued 22 23 Software Launch Continued 22 24 First Screen After Successful Launch Configure Limits and On Off 23 25 Configure Frequency FS Configuration Pop up 24 26 Configure Frequency FS Config Pop Up with Change 25 27 Configure Store Config to NVM 26 28 Change View Screen to Monitor Screen 27 29 System Dashboard 2...

Page 3: ...cedures applicable to your laboratory Caution Do not leave the EVM powered when unattended WARNING The circuit module has signal traces components and component leads on the bottom of the board This may result in exposed voltages hot surfaces or sharp edges Do not reach under the board during operation CAUTION The circuit module may be damaged by over temperature To avoid damage monitor the temper...

Page 4: ...iding a number of test points to evaluate the performance It uses a nominal 12 V input bus to produce a regulated 1 V output at up to 25 A load current 2 1 Typical End User Applications Enterprise Storage SSD NAS Wireless and Wired Communication Infrastructure Industrial PCs Automation ATE PLC Video Surveillance Enterprise Server Switches Routers ASIC SoC FPGA DSP Core and I O Rails 2 2 EVM Featur...

Page 5: ...ons Min Typ Max Units Input Characteristics Voltage range VIN tied to VDD 5 12 14 V Maximum input current VIN 12 V IO 25 A 12 A No load input current VIN 12 V IO 0 A 60 mA Output Characteristics VOUT Output voltage Output current 10 A 1 V IOUT Output load current IOUT min to IOUT max 0 25 A Output voltage regulation Line regulation input voltage 5 V to 14 V 0 5 Load regulation output current 0 A t...

Page 6: ... DNP 1 00 R1 0 R10 1 10k R8 1 50k R5 DNP NT1 Net Tie NT2 Net Tie TP5 SW TP4 MODE FSEL VSEL 25 5k R25 AGND CNTL EN_UVLO LOW 10 0k R15 TP9 BP TP14 100k R20 100k R21 100k R22 BP 100uF C43 DNP 100uF C30 DNP J1 200k R6 100k R12 J4 TP1 VDD TP17 FSEL TP16 MODE TP15 VSEL 0 R11 VDD TP18 PGND TP19 TP20 CLK TP21 DATA TP22 ALERT 61 9k R19 37 4k R23 42 2k R24 0 R7 J2 J3 J5 VOUT 1V NetC31_1 NetC31_1 DRGND BP SM...

Page 7: ...le The application uses the PMBus protocol to communicate with the controller over serial bus by way of a TI USB adapter This adapter can be purchased at http www ti com tool usb to gpio NOTE The TI USB adapter must be purchased separately It is not included with this EVM kit 5 1 2 Features Some of the tasks performed with the GUI include Turn on or off the power supply output either through the h...

Page 8: ...shown in Figure 3 The scope must be adjusted to 20 MHz bandwidth AC coupling at 50 mV division and must be set to 1 µs division Fan During prolonged operation at high loads it may be necessary to provide forced air cooling with a small fan aimed at the EVM Temperature of the devices on the EVM must be maintained below 105 C USB to GPIO Interface Adapter A communications adapter is required between...

Page 9: ...opyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus 7 PWR 847EVM Figure 2 and Figure 3 illustrate the PWR 847EVM overview tip and barrel measurement Figure 2 PWR 847EVM Overview Figure 3 Tip and Barrel Measurement ...

Page 10: ...entation Feedback Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Figure 4 illustrates the EVM and USB interface adapter Figure 4 EVM and USB Interface Adapter ...

Page 11: ...surements TP3 T H loop RemS Remote sense TP11 T H loop RemS Remote sense TP4 T H loop PVIN Sense VIN across C10 TP13 T H loop PGND Sense VIN across C10 TP1 T H loop VDD Supplies the internal circuitry TP17 T H loop ADDR Monitor the ADDR external resistor divider ratio during initial power up TP15 T H loop VSEL Monitor the VSEL external resistor divider ratio during initial power up TP9 T H loop BP...

Page 12: ... False VPBAD True MFR_33 0xF1 0x00 0 MFR_42 0xFA 0x00 0 MFR_44 0xFC 0x0201 ID 0x020 TPS549B22 Revision 0x8 ON_OFF_CONFIG 0x02 0x17 Mode CONTROL Pin Only Control Active High Turn off Immediately OPERATION 0x01 0x00 Operation is not used to enable regulatio Unit ImmediateOff Margin None STATUS_BYTE 0x78 0x00 Status Output Off Vout OV Fault IOUT OC Fault Vin UV Fault Temperature CML STATUS_CML 0x7E 0...

Page 13: ... from 0 ADC to maximum rated output 25 ADC VOUT must remain in regulation as defined in Table 1 10 Vary VIN from 5 V to 14 V VOUT must remain in regulation as defined in Table 1 11 Decrease the load to 0 A 12 Decrease VIN to 0 V or turn off the supply 10 2 Efficiency To measure the efficiency of the power train on the EVM it is important to measure the voltages at the correct location This is nece...

Page 14: ...s www ti com 14 SLUUBN2 March 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus 11 Performance Data and Typical Characteristic Curves Figure 5 through Figure 18 present typical performance curves for the PWR 847EVM SPACE 11 1 Efficiency Figure 5 Efficiency vs Output Cu...

Page 15: ... Data and Typical Characteristic Curves 15 SLUUBN2 March 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus 11 3 Line Regulation Figure 7 Line Regulation of 1 V Output Figure 8 PMBus VOUT Step Up 0 6 V to 1 2 V at 0 A ...

Page 16: ...17 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Figure 9 PMBus VOUT Step Down 1 2 V to 0 6 V at 0 A Figure 10 PMBus VOUT Step Up 0 6 V to 1 2 V at 25 A ...

Page 17: ...March 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Figure 11 PMBus VOUT Step Down 1 2 V to 0 6 V at 25 A Figure 12 PMBUS Multiple Commands ...

Page 18: ...ments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus 11 4 Transient Response Figure 13 Transient Response of 1 V Output at 12 VIN Transient is 0 5 A to 15 5 A the Step is 15 A at 40 A µs 11 5 Output Ripple Figure 14 Output Ripple and SW Node of 1 V Output at 12 VIN 25 A Output ...

Page 19: ... Feedback Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Figure 15 Output Ripple and SW Node of 1 V Output at 12 VIN 0 A Output 11 6 Control On Figure 16 Start up from Control 1 V Output at 12 VIN 0 A Output ...

Page 20: ...ack Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Figure 17 0 5 V Pre bias start up from Control 1 V Output at 12 VIN 10 A Output 11 7 Control Off Figure 18 Start Up and Shutdown 1 V Output at 12 VIN 0 5 A Output ...

Page 21: ...exas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus 11 8 Thermal Image Figure 19 illustrates the thermal image at 1 V output at 12 VIN 25 A output 650 kHz at 25 C ambient Figure 19 Thermal Image at 1 V Output at 12 VIN 25 A Output 650 kHz at 25 C Ambient ...

Page 22: ... A Single Synchronous Step Down Converter With Full Differential Sense and PMBus 12 Fusion GUI Figure 20 through Figure 23 illustrate the Fusion GUI launch and installation dialog windows Figure 20 First Window at Fusion Launch Figure 21 Scan Finds Device Successfully Figure 22 Software Launch Continued Figure 23 Software Launch Continued ...

Page 23: ...e the All Config tab to configure all of the configurable parameters Figure 24 The screen also shows other details like hexadecimal hex encoding Use this screen to configure Power Good Delay Power On Delay Mode Settings Frequency RAMP DCAP3 VDD UVLO On Off Configuration Track and Sequencing Write Protect VOUT Command Voltage VOUT Margin Operation Figure 24 First Screen After Successful Launch Conf...

Page 24: ...right 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Changing the frequency prompts a pop up window with details of the options Figure 25 Figure 25 Configure Frequency FS Configuration Pop up ...

Page 25: ...ange U icon is displayed to offer Undo Change option Change is not retained until either Write to Hardware or Store Config to NVM is selected When Write to Hardware is selected change is committed to volatile memory and defaults back to previous setting on input power cycle When Store Config to NVM is selected change is committed to nonvolatile memory and becomes the new default Figure 26 Figure 2...

Page 26: ...tep Down Converter With Full Differential Sense and PMBus After making changes to one or more configurable parameters the changes can be committed to nonvolatile memory by selecting Store Config to NVM This action prompts a confirm selection pop up and if confirmed the changes are committed to nonvolatile memory Figure 27 Figure 27 Configure Store Config to NVM ...

Page 27: ...orporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus In the lower left corner the different view screens can be changed The view screens can be changed between Configure Monitor and Status as needed Figure 28 Figure 28 Change View Screen to Monitor Screen ...

Page 28: ...ght 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Selecting System Dashboard from mid left screen adds a new window which displays system level information Figure 29 Figure 29 System Dashboard ...

Page 29: ...n Feedback Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Selecting Status from lower left corner shows the status of the controller Figure 30 Figure 30 Status Screen ...

Page 30: ...onous Step Down Converter With Full Differential Sense and PMBus Selecting Store User Configuration to Flash Memory from the device pull down menu has the same functionality as the Store Config to NVM button from the configure screen It results in committing the current configuration to nonvolatile memory Figure 31 Figure 31 Store Configuration To Memory ...

Page 31: ...Down Converter With Full Differential Sense and PMBus Selecting PMBus Logging Figure 32 from the Tools drop down menu enables the logging of all PMBus activity This includes communications traffic for each polling loop between the GUI and the device The user is prompted to select a location for the file to be stored See next screen Figure 33 Figure 32 PMBus Logging ...

Page 32: ...l Differential Sense and PMBus Select the storage location for the file and the type of file As shown Figure 33 the file is a CSV file to be stored in the directory path shown Logging begins when the Start Logging button is selected and stops when it is reselected as Stop Logging This file can rapidly grow in size so caution is advised when using this function Figure 33 PMBus Log Details ...

Page 33: ... A Single Synchronous Step Down Converter With Full Differential Sense and PMBus 13 EVM Assembly Drawing and PCB Layout Figure 34 through Figure 43 show the design of the PWR 847EVM printed circuit board PCB The PWR 847EVM has a 2 oz copper finish for all layers Figure 34 PWR 847EVM Top Layer Assembly Drawing Top View Figure 35 PWR 847EVM Top Solder Mask Top View ...

Page 34: ... 2017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Figure 36 PWR 847EVM Top Layer Top View Figure 37 PWR 847EVM Inner Layer 1 Top View ...

Page 35: ...017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Figure 38 PWR 847EVM Inner Layer 2 Top View Figure 39 PWR 847EVM Inner Layer 3 Top View ...

Page 36: ...017 Submit Documentation Feedback Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Figure 40 PWR 847EVM Inner Layer 4 Top View Figure 41 PWR 847EVM Bottom Layer Top View ...

Page 37: ...bmit Documentation Feedback Copyright 2017 Texas Instruments Incorporated TPS549B22EVM 847 25 A Single Synchronous Step Down Converter With Full Differential Sense and PMBus Figure 42 PWR 847EVM Bottom Solder Mask Top View Figure 43 PWR 847EVM Bottom Overlay Layer Top View ...

Page 38: ...16 V 10 X7R 0805 0805 GRM21BR71C475KA73L Murata H9 H10 H11 H12 4 Bumpon Hemisphere 0 44 X 0 20 Clear Transparent Bumpon SJ 5303 CLEAR 3M J1 J2 J3 J5 4 TERMINAL BLOCK 5 08MM VERT 2POS TH TERM_BLK 2pos 5 08mm ED120 2DS On Shore Technology J4 1 Header 100mil 2x1 Tin TH Header 2 PIN 100mil Tin PEC02SAAN Sullins Connector Solutions J6 1 Header shrouded 100mil 5x2 Gold TH 5x2 Shrouded header 5103308 1 T...

Page 39: ... Sanyo C14 C15 C16 C17 C18 C19 C20 0 22uF CAP CERM 22 µF 25 V 10 X7R 1210 1210 GRM32ER71E226KE15L Murata C21 0 470pF CAP CERM 470 pF 50 V 10 X7R 0603 0603 GRM188R71H471KA01D Murata C23 C37 0 470uF CAP Tantalum Polymer 470 µF 2 5 V 20 0 006 ohm 7 3x2 8x4 3mm SMD 7 3x2 8x4 3mm 2R5TPF470M6L Panasonic C27 C28 C30 C41 C43 0 100uF CAP CERM 100 µF 6 3 V 20 X5R 1210 1210 GRM32ER60J107ME20L Murata C31 0 0 ...

Page 40: ...y set forth above or credit User s account for such EVM TI s liability under this warranty shall be limited to EVMs that are returned during the warranty period to the address designated by TI and that are determined by TI not to conform to such warranty If TI elects to repair or replace such EVM TI shall have a reasonable time to repair such EVM or provide replacements Repaired EVMs shall be warr...

Page 41: ...the user guide with the maximum permissible gain and required antenna impedance for each antenna type indicated Antenna types not included in this list having a gain greater than the maximum gain indicated for that type are strictly prohibited for use with this device Concernant les EVMs avec antennes détachables Conformément à la réglementation d Industrie Canada le présent émetteur radio peut fo...

Page 42: ...ed loads Any loads applied outside of the specified output range may also result in unintended and or inaccurate operation and or possible permanent damage to the EVM and or interface electronics Please consult the EVM user guide prior to connecting any load to the EVM output If there is uncertainty as to the load specification please contact a TI field representative During normal operation even ...

Page 43: ...COST OF REMOVAL OR REINSTALLATION ANCILLARY COSTS TO THE PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES RETESTING OUTSIDE COMPUTER TIME LABOR COSTS LOSS OF GOODWILL LOSS OF PROFITS LOSS OF SAVINGS LOSS OF USE LOSS OF DATA OR BUSINESS INTERRUPTION NO CLAIM SUIT OR ACTION SHALL BE BROUGHT AGAINST TI MORE THAN TWELVE 12 MONTHS AFTER THE EVENT THAT GAVE RISE TO THE CAUSE OF ACTION HAS OCCURRED 8 2 Specif...

Page 44: ... TI Resource NO OTHER LICENSE EXPRESS OR IMPLIED BY ESTOPPEL OR OTHERWISE TO ANY OTHER TI INTELLECTUAL PROPERTY RIGHT AND NO LICENSE TO ANY TECHNOLOGY OR INTELLECTUAL PROPERTY RIGHT OF TI OR ANY THIRD PARTY IS GRANTED HEREIN including but not limited to any patent right copyright mask work right or other intellectual property right relating to any combination machine or process in which TI product...

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