Texas Instruments TPS62351EVM Manual de usuario

User's GuideSLVU186 – October 2006

TPS62351EVM

This User’s Guide describes the characteristics, operation, and use of theTPS62351EVM-122 Evaluation Module (EVM). This EVM demonstrates the TexasInstruments TPS62351 800 mA, 3 MHz, synchronous, step down converter with I

C™interface. This User’s Guide includes setup instructions, a schematic diagram, a bill ofmaterials (BOM), and PCB layout drawings for the evaluation module.

Contents1 Introduction .......................................................................................... 22 Setup ................................................................................................. 23 Operation ............................................................................................ 64 Test Results ......................................................................................... 95 Board Layout ...................................................................................... 126 Schematic and Bill of Materials ................................................................. 18

List of Figures

1 Quick Connection Diagram USB Interface Adapter ............................................ 62Output Controls Tab ................................................................................ 73Preferences Tab .................................................................................... 84 Start Up From Software Enable .................................................................. 95 Output Ripple ..................................................................................... 106 Load Transient, 0 mA to 680 mA Step ......................................................... 117 Load Transient, 680 mA to 0 mA Step ......................................................... 128 Assembly Layer ................................................................................... 139 Top Layer Routing ................................................................................ 1410 Bottom Layer Routing ............................................................................ 1511 Layer 2 Routing ................................................................................... 1612 Layer 3 Routing ................................................................................... 1713 TPS62351EVM-122 Schematic ................................................................. 18

List of Tables

1 HPA122A BOM .................................................................................... 19

Windows2000, WindowsXP are trademarks of Microsoft Corporation.I

C is a trademark of Philips Electronics.

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1 Introduction

1.1 Requirements

1.1.1 Personal Computer Requirements

1.1.2 Printed circuit board assembly

1.1.3 USB Interface Adapter

1.1.4 Software

2 Setup

2.1 Input/Output Connector Descriptions

2.1.1 J1 –VIN Converter 1

2.1.2 J2 – GND Converter 1

2.1.3 J3 – I

C™ Input Converter 1

Introduction

To operate this EVM properly, the user must connect and properly configure the following components.

A computer with a USB port is required to operate this EVM. The TPS62351 interface software runs onthe PC and communicates with the EVM via the PC’s USB port. The user can send commands to theinternal registers of the TPS62351 through the USB port.

•Windows2000™ or WindowsXP™ operating System•USB port•Minimum of 30 MB of free hard disk space (100 MB recommended)•Minimum of 256 MB of RAM

The TPS62351EVM-122 PCB contains the TPS62351 IC and its required external components. Thisboard contains several jumpers and connectors that enable the user to customize the board forspecific operating conditions.

The USB Interface Adapter is the link that allows the PC and the EVM to communicate. One end of theUSB Interface Adapter connects to the PC with the supplied USB cable; the other side of the USBInterface Adapter connects to the EVM with the supplied ribbon cable.When writing a command to the EVM, the interface program running on the PC sends the commandsto the PC USB port. The USB Interface Adapter receives the USB command, converts the signal to anI

C™ protocol, and sends the I

C™ signal to the TPS62351 EVM board.

Texas Instruments has provided software to assist the user in evaluating this EVM. The software canbe installed from the supplied CD or downloaded from the web at www.ti.com .

This section describes the jumpers and connectors on the EVM as well as how to properly connect, setup,and use the TPS62351EVM-122.

This is the positive input supply voltage to converter 1. The leads to the input supply should be twistedand kept as short as possible to minimize EMI transmission.

This is the return connection for the input power supply of converter 1.

This connector is the I

C™ input for converter 1.

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2.1.4 J4 –VIN Converter 2

2.1.5 J5 – GND Converter 2

2.1.6 J6 – I

C™ Input Converter 2

2.1.7 J7 – VOUT Converter 1

2.1.8 J8 – GND Converter 1

2.1.9 J9 –VOUT Converter 2

2.1.10 J10 – GND Converter 2

2.1.11 J11 – SYNC INPUT Converter 2

2.1.12 JP1 –SDA Converter 1

2.1.13 JP2 – SDA Converter 2

Setup

This is the positive input supply voltage to converter 2. The leads to the input supply should be twisted,and kept as short as possible to minimize EMI transmission.

This is the return connection for the input power supply of converter 2.

This connector is the I

C™ input for converter 2.

This is the positive connection for the output of converter 1. Connect this pin to the positive input of theload.

This is the return connection for the output of converter 1.

This is the positive connection for the output of converter 2. Connect this pin to the positive input of theload.

This is the return connection for the output of converter 2.

This connector is used to synchronize the switching of the TPS62351 to an external clock source. Pin 1 ofJ4 connects to the SYNC pin of the TPS62351 on converter 2. Pin 2 of J4 is connected to the ground ofthe TPS62351 on converter 2. The SYNC input has a 1-m Ωpull-down resistor installed on the EVM board.

This jumper is used to tie the I

C™ SDA pin of the TPS62351 to either a 10-k Ωpull-up resistor to theinput voltage or to short the SDA pin to ground. The shunt can be removed if the I

C™ master has its ownpull up or operates from a voltage that is different than the input voltage of the TPS62351. The TexasInstruments USB Interface Adapter provides an active pull up so no jumper should be installed when usingthe adapter supplied with the EVM.

This jumper is used to tie the I

C™ SDA pin of the TPS62351 to either a 10-k Ωpull-up resistor to theinput voltage or to short the SDA pin to ground. The shunt can be removed if the I

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2.1.14 JP3 – SCL Converter 1

2.1.15 JP4 – SCL Converter 2

2.1.16 JP5 –ENABLE Converter 1

2.1.17 JP6 –VSEL Converter 2

2.1.18 JP7 –VSEL Converter 1

2.1.19 JP8 – ENABLE Converter 2

2.2 Software Setup

Setup

This jumper is used to tie the I

C™ SCL pin of the TPS62351 to either a 10-k Ωpull-up resistor to the inputvoltage or to short SCL to ground. The shunt can be removed if the I

C™ master has its own pull up oroperates from a voltage that is different than the input voltage of the TPS62351. The Texas InstrumentsUSB Interface Adapter provides an active pull up so no jumper should be installed when using the adaptersupplied with the EVM.

This jumper is used to tie the I

C™ SCL pin of the TPS62351 to either a 10-k Ωpull-up resistor to the inputvoltage or to short SCL to ground. The shunt can be removed if the I

C™ master has its own pull up oroperates from a voltage that is different than the input voltage of the TPS62351. The Texas InstrumentsUSB Interface Adapter provides an active pull up so no jumper should be installed when using the adaptersupplied with the EVM.

This jumper enables or disables the converter. Connect the shorting jumper from the center ENABLE pinto either the ON or OFF position. This pin should never be left floating.

This jumper is used to select the output voltage of the converter. Placing a shunt between pins 1 and 2(HIGH and VSEL) sets the output voltage of the converter to the voltage defined by the internal VSEL1register. Placing a shunt between pins 2 and 3 (VSEL and LOW) sets the output voltage of the converterto the voltage defined by the internal VSEL0 register.

This jumper enables or disables the converter. Connect the shorting jumper from the center ENABLE pinto either the ON or OFF position. This pin should never be left floating.

If installing from a CD, insert the CD and run Setup.exe, follow all the prompts to allow the software to beinstalled.

If installing from the web, go to the following URL www.ti.com .

Note: this installation page is best viewed with Microsoft Internet Explorer browser (It may not workcorrectly with other browsers).

Click on the install button, the pc should give a security warning to the user, and ask if the user wants toinstall this application, select Install to proceed.

With both types of installation, the software attempts to install the Microsoft Dot Net Framework 2.0 (if it isnot already installed) This framework is required for the software to run.

After installation the software should automatically run.

During future use of the software, it may prompt the user to install a new version if it becomes available onthe web.

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2.3 Hardware Setup Converter 1 (upper board)

2.4 Hardware Setup Converter 2 (lower board)

2.5 Hardware Setup Connection to Host Computer (upper or lower board)

Setup

Note: Verisign code signing is used to prevent any malicious code from changing this application. If at anytime in the future the binaries are modified the code will no longer attempt to run.

Configure JP1, JP3, JP5 and JP7 using a shorting block. Jumpers JP1 and JP3 are used to connect theSDA and SCL lines of the I

C™ interface to a pull-up resistor to the input voltage. The USB InterfaceAdapter supplied with the EVM has its own internal pull-up resistors. Jumpers JP1 and JP3 should be leftopen with no jumper installed when using the USB Interface Adapter supplied with the EVM.

Configure the jumper on JP7 to the desired setting. Shorting between VSEL and HIGH (pin 1 and 2)makes the TPS62351 power up with the output voltage set by the VSEL1 register. Shorting betweenVSEL and LOW (pin 2 and 3) makes the TPS62351 power up with the output voltage set by the VSEL0register.

Configure JP5 as desired. Shorting between EN and ON (pin 1 and 2) enables the TPS62351. Shortingbetween EN and OFF (pin 2 and 3) disables the TPS62351. The EN pin must be tied high (enabled) inorder to establish communications with the IC via the I

C™ interface. The TPS62351 powers up with thedevice disabled no matter how JP5 is set. The software must enable the TPS62350 in order to produce avoltage at the output.

Configure JP2, JP4, JP6 and JP8 using a shorting block. These jumpers are used to connect the SDA andSCL lines of the I

C™ interface to a pull-up resistor to the input voltage. The USB Interface Adaptersupplied with the EVM has its own internal pull-up resistors so no additional pull-up is required. No jumperis necessary if the Texas Instruments USB Interface Adapter is used to communicate with theTPS62351EVM board and JP2 and JP4 should be left open.

Configure the jumper on JP6 to the desired setting. Shorting between VSEL and HIGH (pin 1 and 2)makes the TPS62351 power up with the output voltage set by the VSEL1 register. Shorting betweenVSEL and LOW (pin 2 and 3) makes the TPS62351 power up with the output voltage set by the VSEL0register.

Configure JP8 as desired. Shorting between EN and ON (pin 1 and 2) enables the TPS62351. Shortingbetween EN and OFF (pin 2 and 3) disables the TPS62351. The EN pin must be tied high (enabled) inorder to establish communications with the IC via the I

C™ interface. The TPS62351 powers up with thedevice disabled no matter how JP8 is set. The software must enable the TPS62350 in order to produce avoltage at the output.

Connect the USB Interface Adapter to the host computer using the supplied USB cable. Connect thedesired converter on the TPS62351EVM board to the USB Interface Adapter using the supplied 10 pinribbon cable. The connectors on the ribbon cable are keyed to prevent incorrect installation.

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Host

Computer

USB Cable

Green LED

Indicates

Power

EVM Board

10 Pin Ribbon

Cable

USB

Interface

Adapter

3 Operation

3.1 Operation

Operation

Figure 1. Quick Connection Diagram USB Interface Adapter

Connect an input voltage supply to the TPS62351EVM board. The TPS62351 uses an input voltagebetween 2.7 V and 5.5 V. Connect the positive input voltage to J1 for converter 1 or J4 for converter 2.Connect the input voltage return (ground) connection to J2 for converter 1 or J5 for converter 2.

This section provides descriptions of the EVM Software.

The supplied software is used to communicate with the TPS62351 EVM. Click on the icon on the hostcomputer to start the software. If there is no icon on the host computer then use the start button in thelower left hand corner of the screen to browse the program folders to find the software. Once started, thesoftware will ask which version of the IC is on the board. Check the TPS62351 box and click the continuebox. The software displays the main control panel for the user interface. When initialized, the hostcomputer software automatically searches the internet (if connected) for updates. If a new update isavailable, the software will notify the user of the update, and downloads the update.

The main control panel for the user interface has three main page tabs, EVM Configuration,OutputControls and Preferences. The software will initialize with the EVM Configuration tab selected. This pagecan be used to set register values that correspond to the hardware configuration of the EVM. The EVMcan be operated with the default values.

Figure 2 shows the user interface with the Output Control tab selected. The TPS62351 powers up with theoutput disabled no matter how ENABLE jumper is configured. The ENABLE jumper must be set toENABLED in order for the TPS62351EVM software to communicate with the IC. Once the ENABLEjumper is set to ENABLE, the software can be used to turn on the output of the converter. Push theEN_DCDC button on the Output Control tab to turn the output of the converter on.

The Output Control tab is used to change the output voltage of the TPS62351 via the register settings.The page has two pull down boxes, one for VSEL0 and one for VSEL1, with the available output voltage.The voltages listed in the boxes assume PWM mode of operation, so the actual output voltage of the EVMvaries from the listed values at light loads.

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Control Panel Tabs “Output

Controls” selected

Output Voltage Selection Pull

Down Boxes

TPS62350 Internal Register Values. Can be

altered bit by bit if desired. Will update register

when “Write” button is pushed.

Operation

Figure 2. Output Controls Tab

Figure 3 shows the page of the Preference tab. The Preferences page is used to change the look of theuser interface such as the text color or the color of the boxes used to display a logic one or zero in theregister displays. The preference page also provides an option for cross linking the values in the VSEL0and VSEL1 registers within a selectable percentage. The default is no cross linking. If cross linking isenabled then the difference between VSEL0 and VSEL1 cannot exceed the selected percentage. Thisfeature provides a method to limit the ratio of voltages that can be selected. This can be used to avoidinadvertently selecting output voltages, in the output voltage pull down boxes, that are too high for theapplication being tested.

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Cross Link enable and delta selection

Operation

Figure 3. Preferences Tab

All three tabs show the bit representation of all four internal registers of the TPS62351. These bits can beindividually altered by clicking on them. Clicking on a bit does not immediately change the register value ofthe IC. The Write button must be pushed to update the register with the newly selected bit values. Eachregister display has its own Write button that will only update the register that is displayed next to it. TheWrite To All Registers button will update all four registers with one push.

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4 Test Results

VOUT

SCL pin

20μs/div

Vin=3.6V

VOUT=1.1V

Iout=550mA

1.0V/div

500mV/div

status

8/25/2006 9:33:22 AM

X1 = 104.747 s X = 36.636 sm D m

X2 = 141.383 s 1/ X = 27.2956 kHzm D

P5. . .

value

Measure P1. . . P2freq(C1)

114.295 kHz

P4. . . P6. . .P3. . .

Test Results

This section provides typical performance waveforms for the TPS62351EVM-122 board.

Figure 4. Start Up From Software Enable

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100ns/div

Vin=3.6V

VOUT=1.1V

Iout=550mA

VOUT

SW pin

1.0V/div

10mV/div

status

8/25/2006 9:40:53 AM

X1 = 80.499 s X = 0 nsm D

X2 = 80.499 s 1/ X = ---m D

P5. . .

value

Measure P1. . . P2freq(C1)

2.93117 kHz

P4. . . P6. . .P3. . .

Test Results

Figure 5. Output Ripple

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