Texas Instruments TPS62350EVM-201 Manuale utente

1 Introduction

1.1 Requirements

User's GuideSLVU177 – July 2006

TPS62350EVM-201

This user’s guide describes the characteristics, operation, and use of theTPS62350EVM-201 evaluation module (EVM). This EVM demonstrates the TexasInstruments TPS62350 800-mA, 3-MHz, synchronous, step-down converter with I

Cinterface. This document includes setup instructions, a schematic diagram, a bill ofmaterials, and PCB layout drawings for the evaluation module.

Contents1 Introduction .......................................................................................... 12 Setup ................................................................................................. 23 Operation ............................................................................................ 44 Test Results ......................................................................................... 75 Board Layout ........................................................................................ 86 Schematic and Bill of Materials ................................................................. 13

List of Figures

1Output Controls Tab .............................................................................. 52Preferences Tab ................................................................................... 63 Start-up From Enable .............................................................................. 74 Output Ripple ........................................................................................ 75 Load Transient, 1-mA to 180-mA Step .......................................................... 86 Load Transient, 210-mA to 1-mA Step .......................................................... 87 Assembly Layer ..................................................................................... 98 Top Layer Routing ................................................................................ 109 Bottom Layer Routing ............................................................................ 1110 Layer 2 Routing ................................................................................... 1211 Layer 3 Routing ................................................................................... 1312 TPS62350EVM-201 Schematic ................................................................. 14

List of Tables

1 HPA201A Bill of Materials........................................................................ 15

To operate this EVM properly, connect and properly configure the following components:A personal computer (PC) with a USB port is required to operate this EVM. The TPS62350 interfacesoftware runs on the PC and communicates with the EVM via the PC’s USB port. Commands can besent to the internal registers of the TPS62350 through the USB port.

Personal Computer Requirements•Windows™ 2000 or Windows™ XP operating systemWindows is a trademark of Microsoft Corporation.I

C is a trademark of Philips Corporation.VeriSign is a trademark of VeriSign, Inc..

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2 Setup

2.1 Input/Output Connector Descriptions

2.1.1 J1 – VIN

2.1.2 J2 – GND

2.1.3 J3 – I

C Input

2.1.4 J4 – SYNC INPUT

2.1.5 J5 – VOUT

2.1.6 J6 – GND

Setup

•USB port•Minimum of 30 MB of free hard disk space (100 MB recommended)•Minimum of 256 MB of RAM

Printed-Circuit Board AssemblyThe TPS62350EVM-201 PCB contains the TPS62350 IC and its required external components. Thisboard contains several jumpers and connectors that enable the user to customize the board forspecific operating conditions.

USB Interface AdapterThe 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 a command is written to the EVM, the interface program running on the PC sends thecommands to the PC USB port. The USB interface adapter receives the USB command, converts thesignal to an I

C protocol, and sends the I

C signal to the TPS62350 EVM board

Software

Texas Instruments provides software to assist in evaluating this EVM. The software can be installedfrom the supplied CD or downloaded from the Texas Instruments Web site 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 TPS62350EVM-201.

This is the positive input supply voltage to the converter. 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 the converter.

This connector is the I

C input for the converter.

This connector is used to synchronize the switching of the TPS62350 to an external clock source. Pin 1 ofJ4 connects to the SYNC pin of the TPS62350. Pin 2 of J4 is connected to the ground of the TPS62350.The SYNC input has a 1-M Ωpulldown resistor installed on the EVM board.

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

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

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2.1.7 JP1 – SDA Converter 1

2.1.8 JP2 – SCL Converter 1

2.1.9 JP4 – ENABLE Converter 1

2.1.10 JP3 – VSEL Converter 2

2.2 Software Setup

2.3 Hardware Setup

Setup

This jumper is used to tie the I

C SDA pin of the TPS62350 to either a 10-k Ωpullup resistor to the inputvoltage or to short the SDA pin to ground. The shunt can be removed if the I

C master has its own pullupor operates from a voltage that is different than the input voltage of the TPS62350. The Texas InstrumentsUSB interface adapter provides an active pullup; therefore, do not install a jumper when using the adaptersupplied with the EVM.

This jumper is used to tie the I

C SCL pin of the TPS62350 to either a 10-k Ωpullup resistor to the inputvoltage or to short SCL to ground. The shunt can be removed if the I

C master has its own pullup oroperates from a voltage that is different than the input voltage of the TPS62350. The Texas InstrumentsUSB interface adapter provides an active pullup; therefore, do not install a jumper 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. Never leave this pin 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.

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

If installing from the TI Web site, go to the URL, www.ti.com

Note: This installation page is best viewed with Microsoft Internet Explorer browser (It may notwork correctly with other browsers)

Click on the install button; your PC should give you a security warning and ask if you want to install thisapplication. 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 you to install a new version if one becomes available onthe Web.

Note: VeriSign™ Code Signing is used to prevent any malicious code from changing thisapplication. If at any time in the future the binaries are modified, the code will no longerattempt to run.

Configure JP1, JP2, JP3, and JP4 using a shorting block. These jumpers are used to connect the SDAand SCL lines of the I

C interface to a pullup resistor to the input voltage. The USB interface adaptersupplied with the EVM has its own internal pullup resistors; therefore, no additional pullup is required. Nojumper is necessary if the Texas Instruments USB interface adapter is used to communicate with theTPS62350EVM board, and JP1 and JP2 should be left open.

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3 Operation

Operation

Configure the jumper on JP3 to the desired setting. Shorting between VSEL and HIGH (pins 1 and 2)makes the TPS62350 power up with the output voltage set by the VSEL1 register. Shorting betweenVSEL and LOW (pins 2 and 3) makes the TPS62350 power up with the output voltage set by the VSEL0register.

Configure JP4 as desired. Shorting between EN and ON (pins 1 and 2) enables the TPS62350. Shortingbetween EN and OFF (pins 2 and 3) disables the TPS62350.

Connect the USB interface adapter to your PC using the supplied USB cable. Connect the TPS62350EVMboard to the USB interface adapter using the supplied 10-pin ribbon cable. The connectors on the ribboncable are keyed to prevent incorrect installation.

Connect an input voltage supply to the TPS62350EVM board. The TPS62350 uses an input voltagebetween 2.7 V and 6 V. Connect the positive input voltage to J1. Connect the input voltage return (ground)connection to J2.

This section provides descriptions of the EVM software.

The supplied software is used to communicate with the TPS62350EVM. Click on the icon on the hostcomputer to start the software. The software asks which version of the IC is on the board. Check theTPS62350 box, and click the continue box. The software displays the main control panel for the userinterface. When initialized, the host computer software automatically searches on the Internet (ifconnected) for updates. If a new update is available, the software notifies the user of the update anddownloads it.

The main control panel for the user interface has three main page tabs, EVM Configuration,OutputControls, and Preferences. The software initializes 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.

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Control Panel Tabs “Output

Controls” selected

Output Voltage Selection Pulldown Boxes TPS62350 Internal Register Values. Can be

altered bit by bit if desired. Updates register

when “Write” button is pushed.

Operation

Figure 1 shows the user interface with the Output Control tab selected. This page is used to change theoutput voltage of the TPS62350 via the register settings. The page has two pulldown boxes, one forVSEL0 and one for VSEL1, with the available output voltage. The voltages listed in the boxes assumePWM mode of operation, so the actual output voltage of the EVM varies from the listed values at lightloads.

Figure 1. Output Controls Tab

Figure 2 shows the page of the Preferences 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 1 or 0 in the registerdisplays. The Preferences page also provides an option for cross-linking the values in the VSEL0 andVSEL1 registers within a selectable percentage. The default is no cross-linking. If cross-linking is enabled,then the difference between VSEL0 and VSEL1 cannot exceed the selected percentage. This featureprovides 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 pulldown boxes, that are too high for theapplication being tested.

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Cross Link enable and delta selection

Operation

Figure 2. Preferences Tab

All three tabs show the bit representation of all four internal registers of the TPS62350. 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 only updates the register that is displayed next to it. TheWrite To All Registers button updates all four registers with one push.

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4 Test Results

Enable

2 V/div

Vout

0.5 V/div

50 s/divm

Vin = 3.6 V

Vout = 1.05 V

Rload = 5 W

Switch Pin

2 V/div

Output Ripple

2 mV/div

Vin = 3.6 V

Vout = 1.35 V

Iout = 500 mA

100 sec/div

Test Results

This section provides typical performance waveforms for the TPS62350EVM-201 board.

Figure 3. Start-up From Enable

Figure 4. Output Ripple

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Output Current

100 mA/div

Output Voltage

20 mV/div

PWM MODE

LPFM MODE

Vin = 3.6 V

Vout = 1.05 V

50 s/divm

Output Current

100 mA/div

Output Voltage

20 mV/div

LPFM MODE

PWM MODE

Vin = 3.6 V

Vout = 1.05 V

50 s/divm

5 Board Layout

Board Layout

Figure 5. Load Transient, 1-mA to 180-mA Step

Figure 6. Load Transient, 210-mA to 1-mA Step

This section provides the TPS62350EVM-201 board layout and illustrations.

Board layout is critical for all high-frequency, switch-mode power supplies. Figure 7 through Figure 11show the board layout for the TPS62350EVM-201 PCB. The nodes with high-switching frequencies andcurrents are kept as short as possible to minimize trace inductance. Careful attention has been given tothe routing of high-frequency current loops and a single-point grounding scheme is used. See the datasheet for specific layout guidelines.

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Board Layout

Figure 7. Assembly Layer

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Board Layout

Figure 8. Top Layer Routing

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