Texas Instruments TPS62350EVM-201 Manuale utente

SLVU177A–July 2006–Revised January 2018

TPS62350EVM-201 Evaluation Module

User's Guide

SLVU177A–July 2006–Revised January 2018

TPS62350EVM-201 Evaluation Module

This user’s guide describes the characteristics, operation, and use of the TPS62350EVM-201 evaluation

module (EVM). This EVM demonstrates the Texas Instruments TPS62350 800-mA, 3-MHz, synchronous,

step-down converter with I2C interface. This document includes setup instructions, a schematic diagram, a

bill of materials, and PCB layout drawings for the evaluation module.

Contents

1 Introduction ................................................................................................................... 2

2 Setup .......................................................................................................................... 2

3 Operation ..................................................................................................................... 5

4 Test Results .................................................................................................................. 7

5 Board Layout ................................................................................................................. 9

6 Schematic and Bill of Materials........................................................................................... 12

List of Figures

1Output Controls Tab....................................................................................................... 5

2Preferences Tab ............................................................................................................ 6

3 Start-up From Enable ....................................................................................................... 7

4 Output Ripple................................................................................................................. 7

5 Load Transient, 1-mA to 180-mA Step ................................................................................... 8

6 Load Transient, 210-mA to 1-mA Step ................................................................................... 8

7 Assembly Layer.............................................................................................................. 9

8 Top Layer Routing ......................................................................................................... 10

9 Bottom Layer Routing ..................................................................................................... 10

10 Layer 2 Routing............................................................................................................. 11

11 Layer 3 Routing............................................................................................................. 11

12 TPS62350EVM-201 Schematic .......................................................................................... 12

List of Tables

1 HPA201A Bill of Materials................................................................................................. 13

Trademarks

Microsoft, Windows are registered trademarks of Microsoft Corporation.

VeriSign is a trademark of VeriSign, Inc..

All other trademarks are the property of their respective owners.

Introduction

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1 Introduction

1.1 Requirements

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 interface

software runs on the PC and communicates with the EVM via the PC’s USB port. Commands can be

sent to the internal registers of the TPS62350 through the USB port.

Personal Computer Requirements

• Microsoft®Windows®2000 or Windows XP operating system

• USB port

• Minimum of 30 MB of free hard disk space (100 MB recommended)

• Minimum of 256 MB of RAM

Printed-Circuit Board Assembly

The TPS62350EVM-201 PCB contains the TPS62350 IC and its required external components. This

board contains several jumpers and connectors that enable the user to customize the board for

specific operating conditions.

USB Interface Adapter

The USB interface adapter is the link that allows the PC and the EVM to communicate. One end of the

USB interface adapter connects to the PC with the supplied USB cable; the other side of the USB

interface 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 the

commands to the PC USB port. The USB interface adapter receives the USB command, converts the

signal to an I2C protocol, and sends the I2C signal to the TPS62350 EVM board

Software

Texas Instruments provides software to assist in evaluating this EVM. The software can be installed

from the supplied CD or downloaded from the Texas Instruments Web site at www.ti.com.

2 Setup

This section describes the jumpers and connectors on the EVM as well as how to properly connect, set

up, and use the TPS62350EVM-201.

2.1 Input/Output Connector Descriptions

2.1.1 J1 – VIN

This is the positive input supply voltage to the converter. The leads to the input supply should be twisted

and kept as short as possible to minimize EMI transmission.

2.1.2 J2 – GND

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

2.1.3 J3 – I2C Input

This connector is the I2C input for the converter.

2.1.4 J4 – SYNC INPUT

This connector is used to synchronize the switching of the TPS62350 to an external clock source. Pin 1 of

J4 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-MΩpulldown resistor installed on the EVM board.

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Setup

SLVU177A–July 2006–Revised January 2018

TPS62350EVM-201 Evaluation Module

2.1.5 J5 – VOUT

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

load.

2.1.6 J6 – GND

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

2.1.7 JP1 – SDA Converter 1

This jumper is used to tie the I2C SDA pin of the TPS62350 to either a 10-kΩpullup resistor to the input

voltage or to short the SDA pin to ground. The shunt can be removed if the I2C master has its own pullup

or operates from a voltage that is different than the input voltage of the TPS62350. The Texas Instruments

USB interface adapter provides an active pullup; therefore, do not install a jumper when using the adapter

supplied with the EVM.

2.1.8 JP2 – SCL Converter 1

This jumper is used to tie the I2C SCL pin of the TPS62350 to either a 10-kΩpullup resistor to the input

voltage or to short SCL to ground. The shunt can be removed if the I2C master has its own pullup or

operates from a voltage that is different than the input voltage of the TPS62350. The Texas Instruments

USB interface adapter provides an active pullup; therefore, do not install a jumper when using the adapter

supplied with the EVM.

2.1.9 JP4 – ENABLE Converter 1

This jumper enables or disables the converter. Connect the shorting jumper from the center ENABLE pin

to either the ON or OFF position. Never leave this pin floating.

2.1.10 JP3 – VSEL Converter 2

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 VSEL1

to the voltage defined by the internal VSEL0 register.

2.2 Software Setup

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 not

work correctly with other browsers)

Click on the install button; your PC should give you a security warning and ask if you want to install 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 is

not 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 on

the Web.

NOTE: VeriSign™ Code Signing is used to prevent any malicious code from changing this

application. If at any time in the future the binaries are modified, the code will no longer

attempt to run.

Host

Computer

USB Cable

USB

Interface

Adapter

Green LED

Indicates

Power

10-Pin

Ribbon

Cable

EVM Board

USB Interface Adaptor Quick Connection Diagram

Setup

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2.3 Hardware Setup

Configure JP1, JP2, JP3, and JP4 using a shorting block. These jumpers are used to connect the SDA

and SCL lines of the I2C interface to a pullup resistor to the input voltage. The USB interface adapter

supplied with the EVM has its own internal pullup resistors; therefore, no additional pullup is required. No

jumper is necessary if the Texas Instruments USB interface adapter is used to communicate with the

TPS62350EVM board, and JP1 and JP2 should be left open.

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 between

VSEL and LOW (pins 2 and 3) makes the TPS62350 power up with the output voltage set by the VSEL0

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

between 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 TPS62350EVM

board to the USB interface adapter using the supplied 10-pin ribbon cable. The connectors on the ribbon

cable are keyed to prevent incorrect installation.

Connect an input voltage supply to the TPS62350EVM board. The TPS62350 uses an input voltage

between 2.7 V and 6 V. Connect the positive input voltage to J1. Connect the input voltage return (ground)

connection to J2.

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.

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Operation

SLVU177A–July 2006–Revised January 2018

TPS62350EVM-201 Evaluation Module

3 Operation

This section provides descriptions of the EVM software.

The supplied software is used to communicate with the TPS62350EVM. Click on the icon on the host

computer to start the software. The software asks which version of the IC is on the board. Check the

TPS62350 box, and click the continue box. The software displays the main control panel for the user

interface. When initialized, the host computer software automatically searches on the Internet (if

connected) for updates. If a new update is available, the software notifies the user of the update and

downloads it.

The main control panel for the user interface has three main page tabs, EVM Configuration,Output

Controls, and Preferences. The software initializes with the EVM Configuration tab selected. This page

can be used to set register values that correspond to the hardware configuration of the EVM. The EVM

can be operated with the default values.

Figure 1 shows the user interface with the Output Control tab selected. This page is used to change the

output voltage of the TPS62350 via the register settings. The page has two pulldown 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 EVM varies from the listed values at light

loads.

Figure 1. Output Controls Tab

Cross Link enable and delta selection

Operation

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Figure 2 shows the page of the Preferences tab. The Preferences page is used to change the look of the

user interface such as the text color or the color of the boxes used to display a logic 1 or 0 in the register

displays. The Preferences page also provides an option for cross-linking the values in the VSEL0 and

VSEL1 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 feature

provides a method to limit the ratio of voltages that can be selected. This can be used to avoid

inadvertently selecting output voltages, in the output voltage pull-down boxes, that are too high for the

application being tested.

Figure 2. Preferences Tab

All three tabs show the bit representation of all four internal registers of the TPS62350. These bits can be

individually altered by clicking on them. Clicking on a bit does not immediately change the register value of

the IC. The Write button must be pushed to update the register with the newly selected bit values. Each

Write To All Registers button updates all four registers with one push.

Switch Pin

2 V/div

Output Ripple

2 mV/div

Vin = 3.6 V

Vout = 1.35 V

Iout = 500 mA

100 sec/div

Enable

2 V/div

Vout

0.5 V/div

50 s/divm

Vin = 3.6 V

Vout = 1.05 V

Rload = 5 W

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Test Results

SLVU177A–July 2006–Revised January 2018

TPS62350EVM-201 Evaluation Module

4 Test Results

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

Figure 3. Start-up From Enable

Figure 4. Output Ripple

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

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

Test Results

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

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

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Board Layout

SLVU177A–July 2006–Revised January 2018

TPS62350EVM-201 Evaluation Module

5 Board Layout

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 11

show the board layout for the TPS62350EVM-201 PCB. The nodes with high-switching frequencies and

currents are kept as short as possible to minimize trace inductance. Careful attention has been given to

the routing of high-frequency current loops and a single-point grounding scheme is used. See the data

sheet for specific layout guidelines.

Figure 7. Assembly Layer

Board Layout

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Figure 8. Top Layer Routing

Figure 9. Bottom Layer Routing

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