Texas Instruments TPS60230EVM-047 User Manual

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TPS60230EVM-047

Evaluation Module

User’s Guide

July 2004

PMP Portable Power Products

 

 

SBVU008

IMPORTANT NOTICE

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Texas Instruments

 

 

 

Post Office Box 655303 Dallas, Texas 75265

 

Copyright 2004, Texas Instruments Incorporated

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided may not be complete in terms of requireddesign-,marketing-,and/ormanufacturing-relatedprotective considerations, including product safety measures typically found in the end product incorporating the goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may not meet the technical requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM User’s Guide prior to handling the product. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory practice standards.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or combination in which such TI products or services might be or are used.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

Copyright 2004, Texas Instruments Incorporated

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 0 V and 7 V.

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions concerning the input range, please contact a TI field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM. Please consult the EVM User’s 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, some circuit components may have case temperatures greater than +25°C. The EVM is designed to operate properly with certain components above +25°C as long as the input and output ranges are maintained. These components include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified using the EVM schematic located in the EVM User’s Guide. When placing measurement probes near these devices during operation, please be aware that these devices may be very warm to the touch.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

Copyright 2004, Texas Instruments Incorporated

Preface

Read This First

About This Manual

This user’s guide provides the information needed to set up and operate the TPS60230EVM-047evaluation module. For a more detailed description of the TPS60230, please refer to the product data sheet available from the Texas Instruments web site athttp://www.ti.com. Additional support documents are listed in the sections of this guide entitledRelated Documentation from Texas Instruments.

How to Use This Manual

Throughout this document, the acronym EVM and the phraseevaluation module are synonymous with the TPS60230EVM−047.

Related Documentation From Texas Instruments

The following document(s) provide information regarding Texas Instrument integrated circuits used in the assembly of the TPS60230EVM−047. These documents are available from the TI web site. The last character of the literature number corresponds to the document revision, which is current at the time of the writing of this user’s guide. Newer revisions may be available from the TI web site at http://www.ti.com or by calling the Texas Instruments Literature Response Center at (800) 477−8924 or the Product Information Center at (972) 644−5580. When ordering, identify the document(s) by both title and literature number.

Data Sheets:

Literature Number:

TPS60230

SLVS516

Contents

If You Need Assistance

If you have questions regarding either the use of this evaluation module or the information contained in the accompanying documentation, please contact your local TI sales representative, the Texas Instruments Product Information Center at (972) 644−5580, or visit the TI Semiconductor Online Technical Support pages at http://www.ti.com.

FCC Warning

This equipment is intended for use in a laboratory test environment only. It may generate, use, or radiate radio frequency energy and has not been tested for compliance with the limits of computing devices pursuant to sub−part J of part 15 of the FCC regulations, which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may be required to correct this interference.

Trademarks

All trademarks are the property of their respective owners.

iv

TPS60230EVM 047

This user’s guide describes the characteristics, operation, and use of the TPS60230EVM-047LEDcharge-pumpcurrent-sourceevaluation module (EVM). This EVM features ahigh-efficiencycharge-pump-basedwhite LED driver designed to operate off a single cellLi-Ionbattery and drive up to five white LEDs with up to 20mA each. This user’s guide includes setup instructions, test results, a schematic diagram, a bill of materials (BOM), and printed circuit board (PCB) layout drawings for the evaluation module.

Topic

 

Page

1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . 2

2

Initial Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . 2

3

Printed Circuit Board (PCB) Layout . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . 4

4

Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . 5

5

Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . 5

TPS60230EVM-0471

Introduction

1 Introduction

The Texas Instruments TPS60230EVM-047evaluation module (EVM) helps designers evaluate the operation and performance of the TPS60230. This device is an efficientcharge-pump-basedcurrent sink that can drive up to five white LEDs with 25mA each. Efficiency is improved by switching between a 1.0x and 1.5x mode, based on the input voltage.

This EVM is specifically designed and optimized to operate with a single-cellLi-Ionbattery input. The default maximum current setting for this EVM is 20mA per LED. If desired, this EVM can easily be modified to supply higher or lower currents by appropriately selecting the ISET resistor, R1. Refer to the data sheet (SLVS516) for more information on adjusting the LED current.

2 Initial Configuration

This section describes the jumpers and connectors on the EVM, as well as how to properly connect, set up, and use the TPS60230EVM-047.

2.1Input/Output Connector Descriptions

2.1.1J1: VIN

This is the positive connection to the input power supply or battery.

2.1.2J2: GND

This is the return connection for the input power supply or battery.

2.1.3JP1: EN2

This jumper will ground the EN2 pin or connect it to VIN. If the both EN1 and EN2 are connected to VIN, the LED current will be the full programmed value set by R1. For this EVM, that current is 20mA. If EN2 is connected to ground and EN1 is high, the LED current will be set to 1/3 the programmed value, or 6.66mA. If both EN1 and EN2 are grounded, the LEDs will turn off.

2.1.4JP2: EN1

This jumper will ground the EN1 pin or connect it to VIN. If the both EN1 and EN2 are connected to VIN, the LED current will be the full programmed value set by R1. For this EVM, that current is 20mA. If EN1 is connected to ground and EN2 is high, the LED current will be set to 2/3 the programmed value, or 13.33mA. If both EN1 and EN2 are grounded, the LEDs will turn off.

2

Input/Output Connector Descriptions

2.2Setup

Connect an input supply or battery between J1 and J2. The voltage range on this supply should stay between 2.7V and 6.0V. Set the appropriate brightness by configuring JP1 and JP2.

2.3Operation

The EVM has been optimized to operate from a single-cellLi-Ionbattery with an input voltage range of 2.7V to 6.0V. The value for R1 programs the maximum LED current. For this EVM, the maximum current is set to 20mA. However, by changing the value of R1, LED currents up to 25mA can be achieved. Currents less than 20mA can be achieved by appropriately configuring JP1 and JP2, as shown in Table 1.

Table 1. Relative LED Current Levels

JP1 (EN2)

JP2 (EN1)

LED CURRENT

 

 

 

0

0

0

 

 

 

0

1

1/3 full

 

 

 

1

0

2/3 full

 

 

 

1

1

Full (20mA for R1 = 7.87kΩ)

 

 

 

EN1 and EN2 can also be used for pulse width modulator (PWM) dimming. The PWM signal can be applied to EN1, EN2, or both. In this case, the LED current is proportional to duty factor and can have a maximum current dictated by how EN1 and EN2 are configured. The maximum recommended PWM frequency is 50kHz, and the minimum recommended ON time is 2.5us. Refer to the datasheet (SLVS516) for more information in regards to PWM dimming.

2.4Test Results

The efficiency curve in Figure 1 reflects the power delivered to the LED. The output power used for the efficiency calculation is the sum of all the LED currents multiplied by the LED forward voltage.

Figure 1. Efficiency vs VIN

Efficiency (%)

90

EN2 and EN1 = On

80

ILED = 20mA

70

60

50

40

30

20

10

0

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

5.9

6.3

6.5

Input Voltage (V)

TPS60230EVM-0473

Printed Circuit Board (PCB) Layout

3 Printed Circuit Board (PCB) Layout

PCB layout is critical for all switch-modepower supplies. Figure 2, Figure 3, and Figure 4 show the board layout for theTPS60230EVM-047PWB. The nodes with high switching frequencies and currents are short and are isolated from thenoise-sensitivefeedback circuitry. Careful attention has been given to the routing ofhigh-frequencycurrent loops. Refer to the product datasheet (SLVS516) for specific layout guidelines.

Figure 2. Assembly Layer

Figure 3. Top Layer Routing

Figure 4. Bottom Layer Routing

4