Texas Instruments TPS549B22EVM-847 User Manual

User's Guide

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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

1 Introduction ................................................................................................................... 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 Procedure ......................................................... 13

10.2 Efficiency ........................................................................................................... 13

10.3 Equipment Shutdown ............................................................................................. 13

11 Performance Data and Typical Characteristic Curves................................................................. 14

11.1 Efficiency ........................................................................................................... 14

11.2 Load Regulation ................................................................................................... 14

11.3 Line Regulation.................................................................................................... 15

11.4 Transient Response............................................................................................... 18

11.5 Output Ripple ...................................................................................................... 18

11.6 Control On.......................................................................................................... 19

11.7 Control Off.......................................................................................................... 20

11.8 Thermal Image..................................................................................................... 21

12 Fusion GUI ................................................................................................................. 22

13 EVM Assembly Drawing and PCB Layout .............................................................................. 33

14 List of Materials............................................................................................................. 38

1 PWR-847EVM Schematic .................................................................................................. 6

2 PWR-847EVM Overview.................................................................................................... 9

3 Tip and Barrel Measurement............................................................................................... 9

4 EVM and USB Interface Adapter......................................................................................... 10

5 Efficiency vs Output Current SKIP Mode ............................................................................... 14

6 Power Loss vs Output Current SKIP Mode............................................................................. 14

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List of Figures

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7 Line Regulation of 1-V Output............................................................................................ 15

8 PMBus V 9 PMBus V 10 PMBus V 11 PMBus V

Step-Up = 0.6 V to 1.2 V at 0 A........................................................................... 15

OUT

Step-Down = 1.2 V to 0.6 V at 0 A ....................................................................... 16

OUT

Step-Up = 0.6 V to 1.2 V at 25 A ......................................................................... 16

OUT

Step-Down = 1.2 V to 0.6 V at 25 A...................................................................... 17

OUT

12 PMBUS Multiple Commands ............................................................................................. 17

13 Transient Response of 1-V Output at 12 V 14 Output Ripple and SW Node of 1-V Output at 12 V 15 Output Ripple and SW Node of 1-V Output at 12 V 16 Start up from Control, 1-V Output at 12 V 17 0.5-V Pre-bias start up from Control, 1-V Output at 12 V 18 Start-Up and Shutdown, 1-V Output at 12 V 19 Thermal Image at 1-V Output at 12 V

, Transient is 0.5 A to 15.5 A, the Step is 15 A at 40 A/µs....... 18

, 25-A Output ................................................. 18

, 0-A Output .................................................. 19

, 0-A Output .............................................................. 19

, 10-A Output ........................................... 20

, 0.5-A Output......................................................... 20

, 25-A Output, 650 kHz at 25°C Ambient ................................. 21

20 First Window 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......................................................................................................... 28

30 Status Screen............................................................................................................... 29

31 Store Configuration To Memory.......................................................................................... 30

32 PMBus Logging............................................................................................................. 31

33 PMBus Log Details......................................................................................................... 32

34 PWR-847EVM Top Layer Assembly Drawing (Top View)............................................................ 33

35 PWR-847EVM Top Solder Mask (Top View)........................................................................... 33

36 PWR-847EVM Top Layer (Top View) ................................................................................... 34

37 PWR-847EVM Inner Layer 1 (Top View) ............................................................................... 34

38 PWR-847EVM Inner Layer 2 (Top View) ............................................................................... 35

39 PWR-847EVM Inner Layer 3 (Top View) ............................................................................... 35

40 PWR-847EVM Inner Layer 4 (Top View) ............................................................................... 36

41 PWR-847EVM Bottom Layer (Top View) ............................................................................... 36

42 PWR-847EVM Bottom Solder Mask (Top View)....................................................................... 37

43 PWR-847EVM Bottom Overlay Layer (Top View) ..................................................................... 37

1 PWR-847EVM Electrical Performance Specifications .................................................................. 5

2 Test Point Functions ....................................................................................................... 11

3 Key Factory Configuration Parameters.................................................................................. 12

4 List of Test Points for Line and Load Measurements ................................................................. 13

5 List of Test Points for Efficiency Measurements ....................................................................... 13

6 PWR847 List of Materials ................................................................................................. 38

TPS549B22EVM-847, 25-A Single Synchronous Step-Down Converter With Full Differential Sense and PMBus™

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1 Introduction

The PWR847EVM evaluation module uses the TPS549B22 device. The TPS549B22 is a highly integrated synchronous buck converter that is designed for up to 25-A current output.

1.1 Before You Begin

The following warnings and cautions are noted for the safety of anyone using or working close to the TPS549B22EVM-847. Observe all safety precautions.

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.

Introduction

Warning The TPS549B22EVM-847 circuit module may become hot

during operation due to dissipation of heat. Avoid contact with the board. Follow all applicable safety procedures applicable to your laboratory.

Caution Do not leave the EVM powered when unattended.

WARNING

CAUTION

The circuit module may be damaged by over temperature. To avoid damage, monitor the temperature during evaluation and provide cooling, as needed, for your system environment.

CAUTION

Some power supplies can be damaged by application of external voltages. If using more than 1 power supply, check your equipment requirements and use blocking diodes or other isolation techniques, as needed, to prevent damage to your equipment.

CAUTION

The communication interface is not isolated on the EVM. Be sure no ground potential exists between the computer and the EVM. Also be aware that the computer is referenced to the Battery- potential of the EVM.

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Description

2 Description

The PWR-847EVM is designed as a single output DC-DC converter that demonstrates the TPS549B22 in a typical low-voltage application while providing 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 Features

• Regulated 1-V output up to 25-A, steady-state output current

• Convenient test points for probing critical waveforms

• PMBus™ connector for easy connection with the TI USB adapter

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3 EVM Electrical Performance Specifications

Table 1 lists the PWR-847EVM electrical performance specifications.

Table 1. PWR-847EVM Electrical Performance Specifications

Parameter Test Conditions Min Typ Max Units

Input Characteristics

Voltage range VINtied 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

Output voltage Output current = 10 A 1 V

OUT

Output load current I

OUT

Output voltage regulation

Output voltage ripple VIN= 12 V, I

OUT

Output overcurrent 32 A

OUT

Systems Characteristics

Switching frequency F

Peak efficiency VIN= 12 V, IO= 12 A, FSW= 650 kHz 90%

OUT

Operating temperature T

to I

OUT(min)

OUT(max)

Line regulation: input voltage = 5 V to 14 V 0.5% Load regulation: output current = 0 A to I

= 25 A 10 mV

OUT

oper

EVM Electrical Performance Specifications

0 25 A

OUT(max)

0.5%

650 kHz

0 85 ºC

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

Full Differential Sense and PMBus™

PGND

22uF

C16

DNP

22uF

C15

DNP

22uF

C14

DNP

22µF

C13

330uF

C12

DNP

330uFC1DNP

2200pF

C10

22µF

DRGND

1uF

C34

DNP

1µF

C35

100µF

C33

100µF

C40

100µF

C41

DNP

100µF

C42

100µF

C29

0.1µF

C22

330nH

TP3

CHB

100µF

C27

DNP

100µF

C28

DNP

100µF

C39

6800pF

C32

DNP

TP7

CHA

470pF

C21

DNP

0.1uF

C31

DNP

100µF

C26

100µF

C25

R14

DNP1000pF

C36

DNP

3.01

DNP

1uF

C44DNP

4.7µF

C45

TP12 ILIM

AGND

DRGND

470uF

C37

DNP

470µF

C24

470µF

C38

470µF

C23

DNP

R16

1000pF

C46DNP

AGND

DNP

TP8

PGOOD

100k

R13

PGND

TP13

AGND PGND DRGND

CNTL

CLK

DATA

ALERT

MODE

FSEL

VSEL

PGND

100µF

C11

TP2

TP10

1 2 3 4 5 6 7 8 9 10

DATA

CLK

ALERT

PMBus

AGND

----- GND NET TIES -----

Remote Sense pos/neg should run as balanced pair

VIN = 6V - 16V

I_OUT = 25A MAX

22uF

C17

DNP

22uF

C18

DNP

22uF

C19

DNP

22µF

C20

DNP

TP6

TP11

R17

DNP

R18

DNP

1.00

R10

1.10k

1.50k

DNP

NT1

Net-Tie

NT2

Net-Tie

TP5 SW

TP4

MODE FSELVSEL

25.5k

R25

AGND

CNTL/EN_UVLO

LOW

10.0k

R15

TP9

TP14

100k

R20

100k

R21

100k

R22

100uF

C43

DNP

100uF

C30

DNP

200k

100k

R12

TP1

VDD

TP17 FSEL

TP16 MODE

TP15

VSEL

R11

VDD

TP18

PGND

TP19

TP20 CLK

TP21 DATA

TP22 ALERT

61.9k

R19

37.4k

R23

42.2k

R24

VOUT = 1V

NetC31_1

DRGND

SMB_ALRT#

PMB_DATA

PMB_CLK

EN_UVLO

BOOT

PGND

PVIN

VDD

DRGND

AGND

ADDR

VSEL

MODE

PGOOD

ILIM

RESV_TRK

RSN

RSP

VOSNS

PAD

TPS549B22RVFR

Schematic

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4 Schematic

Figure 1 illustrates the PWR-847EVM schematic.

Figure 1. PWR-847EVM Schematic

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5 Test Setup

5.1 Test and Configuration Software

To change any of the default configuration parameters on the EVM, it is necessary to obtain the TI Fusion Digital Power Designer software. This can be downloaded from the TI website.

5.1.1 Description

The Fusion Digital Power Designer is the graphical user interface (GUI) used to configure and monitor the Texas Instruments TPS549B22 power converter installed on this evaluation module. 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 hardware control line or the PMBus

operation command.

• Monitor status registers. Items such as input voltage, output voltage, output current, temperature, and

warnings and faults are continuously monitored and displayed by the GUI.

• Configure common operating characteristics such as VOUT, UVLO, soft-start time, warning and fault

thresholds, fault response, and ON/OFF.

This software is available for download at http://www.ti.com/tool/fusion_digital_power_designer.

Test Setup

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Test Equipment

6 Test Equipment

Voltage Source: The input voltage source VIN must be a 0-V to 18-V variable DC source capable of

supplying at least 12 ADC. Multimeters: It is recommended to use two separate multimeters Figure 2. One meter is used to measure

VINand one to measure V Output Load: A variable electronic load is recommended for testing Figure 2. It must be capable of 25 A

at voltages as low as 0.6 V. Oscilloscope: An oscilloscope is recommended for measuring output noise and ripple. Output ripple must

be measured using a tip-and-barrel method or better as 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 the EVM and the host computer. This EVM was designed to use TI's USB-to-GPIO adapter. Purchase this adapter at

http://www.ti.com/tool/usb-to-gpio.

Recommended Wire Gauge: The voltage drop in the load wires must be kept as low as possible in order to keep the working voltage at the load within its operating range. Use the AWG 14 wire (2 wires parallel for VOUT positive and 2 wires parallel for the VOUT negative) of no more than 1.98 feet between the EVM and the load. This recommended wire gauge and length should achieve a voltage drop of no more than

0.2 V at the maximum 25-A load.

OUT

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Metal Ground

Barrel

Tip

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7 PWR-847EVM

Figure 2 and Figure 3 illustrate the PWR-847EVM overview, tip and barrel measurement.

PWR-847EVM

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Figure 2. PWR-847EVM Overview

Figure 3. Tip and Barrel Measurement

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

Full Differential Sense and PMBus™

PWR-847EVM

Figure 4 illustrates the EVM and USB interface adapter.

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TPS549B22EVM-847, 25-A Single Synchronous Step-Down Converter With Full Differential Sense and PMBus™

Figure 4. EVM and USB Interface Adapter

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8 List of Test Points, Jumpers, and Switch

Table 2 lists the test points and their descriptions.

Table 2. Test Point Functions

Item Type Name Description

TP5 T-H loop SW Power supply Switch node TP7 T-H loop CH-A Measure loop stability TP6 T-H loop CH-B Measure loop stability

TP2 T-H loop LocS+

TP10 T-H loop LocS-

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 LDO output

TP8 T-H loop PG Power good TP16 T-H loop MODE Monitor the MODE external resistor divider ratio during initial power up. TP12 T-H loop ILIM Program over-current limit. TP14 T-H loop RESV_TRK Do not connect. TP19 T-H loop PGND Common GND TP18 T-H loop PGND Common GND TP20 T-H loop PMB_CLK Clock input for the PMBus interface. TP21 T-H loop PMB_DATA Data I/O for the PMBus interface. TP22 T-H loop SMB_ALRT# Alert output for the PMBus interface.

JP4 2-pin jumper CNTL Shunts control pin to GND

Sense VOUT + locally across C25. Use for efficiency and ripple measurements

Sense VOUT– locally across C25. Use for efficiency and ripple measurements

List of Test Points, Jumpers, and Switch

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EVM Configuration Using the Fusion GUI

9 EVM Configuration Using the Fusion GUI

The TPS549B22 installed on this EVM leave the factory pre-configured. See Table 3 for a short list of key factory configuration parameters as obtained from the configuration file.

Table 3. Key Factory Configuration Parameters

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Cmd ID With Phase Cmd Code Hex Encoded Hex

[HiByte|LoByte]

CAPABILITY 0x19 0xD0 Max Bus: 1000 kHz; PEC: Yes; SMBALERT#: Yes MFR_00 0xD0 0x00 0 MFR_01 (PGOOD_DLY) 0xD1 0x12 PGD:1024?s [010b], POD:1024?s [010b] MFR_02 0xD2 0x13 CM: True, HICLOFF: True, SST: 0x00, FORCESKIPSS:

MFR_03 0xD3 0x93 FS:650 kHz [011b], RCSP:R ? 1 [01b], DCAP3:True MFR_04 0xD4 0x80 DCAP3_Offset:0mV [00b], DCAP3_Offset_Sel:True MFR_06 0xD6 0x05 VDDUVLO:4.25V [101b] MFR_07 0xD7 0x8F VTRKIN:1.25V [1111b], TRKOPTION:False,

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

OPERATION 0x01 0x00 Operation is not used to enable regulatio; Unit:

STATUS_BYTE 0x78 0x00 Status: Output Off, Vout OV Fault, IOUT OC Fault, Vin

STATUS_CML 0x7E 0x00 Status: Invalid Command, Invalid Data, PEC Fault, Other

STATUS_IOUT 0x7B 0x00 Status: Iout OC Fault, Iout OC Fault with LV Shutdown,

STATUS_VOUT 0x7A 0x00 Status: Vout OV Fault, OV Warning, UV Fault, UV

VOUT_COMMAND 0x21 0x01CD VOUT_COMMAND=0.900 V VOUT_MARGIN_HIGH 0x25 0x0266 VOUT_MARGIN_HIGH=1.199 V VOUT_MARGIN_LOW 0x26 0x0266 VOUT_MARGIN_LOW=1.199 V WRITE_PROTECT 0x10 0x00 Enable Writes To All Commands

Comments

True, SEQ: False, TRK: False

SPARE:False, VPBAD:True

Immediately

ImmediateOff; Margin: None

UV Fault, Temperature, CML

Comms Fault

Iout UC Fault

Warning

If it is desired to configure the EVM to settings other than the factory settings shown in Table 3, the TI Fusion Digital Power Designer software can be used for reconfiguration. It is necessary to have input voltage applied to the EVM prior to launching the software so that the TPS549B22 installed is active and able to respond to the GUI and the GUI can recognize the device.

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10 Test Procedure

10.1 Line and Load Regulation Measurement Procedure

Use the following procedures for line and load regulation measurement.

1. Connect VOUT to J3 and VOUT_GND to J5 Figure 2.

2. Ensure that the electronic load is set to draw 0 ADC.

3. Connect VIN to J1 and VIN_GND to J2 Figure 2.

4. Connect the USB interface adapter as shown in Figure 4.

5. Increase VINfrom 0 V to 12 V using the digital multimeter to measure input voltage.

6. Launch the Fusion GUI software. See the screen shots in Section 12 for more information.

7. Configure the EVM operating parameters as desired.

8. Use the other digital multimeter or the oscilloscope to measure output voltage V as you vary the external voltage source.

Table 4. List of Test Points for Line and Load Measurements

Test Point Node Name Description

TP2 LocS+ Sense VOUT + locally across C5. Use for efficiency and ripple measurements

TP10 LocS– Sense VOUT - locally across C5. Use for efficiency and ripple measurements

TP4 PVIN Sense VIN + across C10

TP13 PGND Sense VIN - across C10

Test Procedure

at TP2 and TP10

OUT

9. Vary the load from 0 ADCto maximum rated output 25 ADC. V

Table 1.

10. Vary VINfrom 5 V to 14 V. V

11. Decrease the load to 0 A.

12. Decrease VINto 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 necessary because otherwise the measurements will include losses in efficiency that are not related to the power train itself. Losses incurred by the voltage drop in the copper traces and in the input and output connectors are not related to the efficiency of the power train, and they must not be included in efficiency measurements.

Test Point Node Name Description

TP2 LocS+ Sense VOUT + locally across C25. Use for efficiency and ripple measurements

TP10 LocS- Sense VOUT - locally across C25. Use for efficiency and ripple measurements

TP4 PVIN Sense VIN + across C10

TP13 PGND Sense VIN - across C10

Input current can be measured at any point in the input wires, and output current can be measured anywhere in the output wires of the output being measured. Using these measurement points result in efficiency measurements that do not include losses due to the connectors and PCB traces.

must remain in regulation as defined in

OUT

must remain in regulation as defined in Table 1.

OUT

Table 5. List of Test Points for Efficiency Measurements

10.3 Equipment Shutdown

1. Reduce the load current to 0 A.

2. Reduce input voltage to 0 V.

3. Shut down the external fan if in use.

4. Shut down equipment.

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

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Load Current (A)

Converter Power Loss (W)

0 5 10 15 20 25

0.5

1.5

2.5

3.5

4.5

D002

VIN = 5 V VIN = 12 V VIN = 14 V VIN = 18 V

Load Current (A)

Efficiency (%)

0 5 10 15 20 25

100

D001

VIN = 5 V VIN = 12 V VIN = 14 V VIN = 18 V

Performance Data and Typical Characteristic Curves

11 Performance Data and Typical Characteristic Curves

Figure 5 through Figure 18 present typical performance curves for the PWR-847EVM.

SPACE

11.1 Efficiency

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Figure 5. Efficiency vs Output Current SKIP Mode

11.2 Load Regulation

TPS549B22EVM-847, 25-A Single Synchronous Step-Down Converter With Full Differential Sense and PMBus™

Figure 6. Power Loss vs Output Current SKIP Mode

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+ 30 hidden pages

Texas Instruments TPS549B22EVM-847 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual