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User's Guide

SLVU215B – August 2007 – Revised November 2007

TPS61050EVM-269 and TPS61052EVM-269

This user’s guide describes the characteristics, operation, and use of the TPS61050EVM-269 and

TPS61052EVM-269 evaluation modules (EVMs). This EVM demonstrates either the Texas Instruments

TPS61050 or TPS61052 synchronous boost converter based high power WLED driver with I

C 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 Software Setup and Operation ............................................................................................. 6

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

5 Board Layout ................................................................................................................ 10

6 Schematics and Bill of Materials ......................................................................................... 13

List of Figures

1 TPS6105x Software Main Panel ........................................................................................... 6

2 LED Efficiency vs. Input Voltage - Torch Mode .......................................................................... 7

3 LED Efficiency vs. Input voltage - Single Pulse Flash Mode ........................................................... 8

4 Torch Flash Sequence ...................................................................................................... 8

5 Start Up in Torch ............................................................................................................. 9

6 Inrush Current at Flash ..................................................................................................... 9

7 Voltage Mode Efficiency ................................................................................................... 10

8 Voltage Mode Load Transient ............................................................................................ 10

9 Assembly Layer............................................................................................................. 11

10 Top Layer .................................................................................................................... 11

11 Layer 2 ....................................................................................................................... 12

12 Layer 3 ...................................................................................................................... 12

13 Bottom Layer ................................................................................................................ 13

14 TPS61050/2EVM-269 Schematic ........................................................................................ 14

List of Tables

1 Jumper Settings .............................................................................................................. 5

2 TPS61050EVM-269 and TPS61052EVM-269 (HPA269-001 and HPA269-002) Bill of Materials ............... 15

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SLVU215B – August 2007 – Revised November 2007 TPS61050EVM-269 and TPS61052EVM-269 1

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Summary of content (17 pages)

PAGE 1
User's Guide SLVU215B – August 2007 – Revised November 2007 TPS61050EVM-269 and TPS61052EVM-269 This user’s guide describes the characteristics, operation, and use of the TPS61050EVM-269 and TPS61052EVM-269 evaluation modules (EVMs). This EVM demonstrates either the Texas Instruments TPS61050 or TPS61052 synchronous boost converter based high power WLED driver with I2C interface.
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www.ti.com Introduction 1 Introduction 1.1 Requirements To operate this EVM, connect and properly configure the following components: A personal computer (PC) with a USB port is required to operate this EVM. The TPS61050/2 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 TPS61050/2 through the USB port.
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www.ti.com Setup 2.1.5 2 J5 – I C Input This connector provides a connection for the included USB-TO-GPIO interface adapter. The included software uses the adapter to communicate with the EVM using the I2C protocol. 2.1.6 J6 – PULSE GEN / GND This header can be used to connect an external pulse generator to drive the gate of transistor Q1. Transistor Q1, along with components R5 - R7, can be used to perform load transient testing and confirm stability. 2.1.
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www.ti.com Setup 2.1.14 JP4 – INPUT: VIN or GND The middle pin of this jumper connects the INPUT side of JP2. This jumper is intended to facilitate connection of either the TPS61050 GPIO, when configured as INPUT, or the TPS61052 ENVM pin to VIN, for a logic high, or GND, for a logic low. JP2 must be connected to INPUT for this jumper to be effective. The jumper default position is uninstalled. 2.1.15 JP5 – OPEN LED This jumper is in series with power WLED, D2.
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www.ti.com Setup 2.3 Hardware Setup Table 1 shows the board DEFAULT jumper settings. Table 1. Jumper Settings JUMPER DEFAULT JP1 Installed JP2 Uninstalled JP3 Uninstalled JP4 Uninstalled JP5 Installed Connect the USB-TO-GPIO adapter to your PC using the supplied USB cable. Connect the TPS61050/2EVM connector J5 to the USB-TO-GPIO adapter using the supplied 10-pin ribbon cable. The connectors on the ribbon cable are keyed to prevent incorrect installation.
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www.ti.com Software Setup and Operation 3 Software Setup and Operation This section provides descriptions of the EVM software. The supplied software is used to communicate with the TPS61050/2EVM. Click on the icon on the host PC to start the software. The host PC software first checks the firmware version of the USB-TO-GPIO adapter box. If an incorrect firmware version is installed, the software automatically searches on the Internet (if connected) for updates.
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www.ti.com Test Results It is recommended that the user press the READ ALL REGISTERS button immediately after loading the software to confirm that the software and cable connections are working properly. The message box at the top right of the control panel displays whether or not the TPS61050/2 is operational and the middle message box at the bottom displays whether or not the USB-TO-GPIO connection s functional.
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www.ti.com Test Results 90 LED Efficiency (PLED/PIN) - % 80 ILED = 700 mA 70 ILED = 300 mA 60 50 40 30 20 10 0 2.5 3 3.5 4 4.5 VI - Input Voltage - V 5 5.5 Figure 3. LED Efficiency vs. Input voltage - Single Pulse Flash Mode 5 V/div FLASH VI = 3.2 V VOUT C2 = -3.60000 V Offset 500 mV/div 200 mV/div 500 mA/div ILED VLED t - Time - 100 ms/div Figure 4.
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www.ti.com 5 V/div Test Results SEL VI = 3.6 V, Itorch = 75 mA 100 mA/div 50 mA/div 1 V/div VOUT ILED IL t - Time - 200 ms/div Figure 5. Start Up in Torch 50 mV/div 5 V/div FLASH VI = 3.6 V C3 = -3.50000 V Offset VIN 500 mA/div ILED 500 mA/div IL t - Time - 50 ms/div Figure 6.
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www.ti.com Board Layout 100 VI = 3.6 V, VO = 5 V 90 80 Efficiency - % 70 60 50 40 30 20 10 0 1 10 100 IO - Output Current - mA 1000 500 mV/div 500 mA/div Figure 7. Voltage Mode Efficiency VI = 3.6 V, VO = 5 V IOUT VOUT C1 = -5.000 V Offset 500 mA/div ILED t - Time - 50 ms/div Figure 8. Voltage Mode Load Transient 5 Board Layout This section provides the TPS61050/2EVM-269 board layout and illustrations. Board layout is critical for all high-frequency, switch-mode power supplies.
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www.ti.com Board Layout Figure 9. Assembly Layer Figure 10.
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www.ti.com Board Layout Figure 11. Layer 2 Figure 12.
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www.ti.com Schematics and Bill of Materials Figure 13. Bottom Layer 6 Schematics and Bill of Materials This section provides the TPS61050/2EVM-215 schematic and bill of materials.
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www.ti.com Schematics and Bill of Materials 6.1 Schematics Figure 14.
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www.ti.com Schematics and Bill of Materials 6.2 Bill of Materials Table 2. TPS61050EVM-269 and TPS61052EVM-269 (HPA269-001 and HPA269-002) Bill of Materials COUNT -001 -002 Ref Des Value Description Size Part Number MFR 1 1 C1 1000pF Capacitor, Ceramic, 50V, C0G, 5% 0402 GRM1555C1H102JA01D muRata 2 2 C2, C3 10uF Capacitor, Ceramic, 6.
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EVALUATION BOARD/KIT IMPORTANT NOTICE Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.