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User's Guide

SLVU202B – May 2007 – Revised November 2007

TPS61050EVM-215 and TPS61052EVM-215

This user’s guide describes the characteristics, operation, and use of the TPS61050EVM-215 and

TPS61052EVM-215 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 ................................................................................................................ 11

6 Schematics and Bill of Materials ......................................................................................... 14

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 .................................................................................................... 10

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

8 Voltage Mode Load Transient ............................................................................................ 11

9 Assembly Layer............................................................................................................. 12

10 Top Layer .................................................................................................................... 12

11 Layer 2 ....................................................................................................................... 13

12 Layer 3 ...................................................................................................................... 13

13 Bottom Layer ................................................................................................................ 14

14 TPS61050/2EVM-215 Schematic ........................................................................................ 15

List of Tables

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

2 HPA215 Bill of Materials................................................................................................... 16

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SLVU202B – May 2007 – Revised November 2007 TPS61050EVM-215 and TPS61052EVM-215 1

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Summary of content (18 pages)

PAGE 1
User's Guide SLVU202B – May 2007 – Revised November 2007 TPS61050EVM-215 and TPS61052EVM-215 This user’s guide describes the characteristics, operation, and use of the TPS61050EVM-215 and TPS61052EVM-215 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 2.1.3 2 J3 – I C Input This header provides a connection for the included USBTOGPIO interface adapter. The included software uses the adapter to communicate with the EVM using the I2C protocol. 2.1.4 J4 – 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 2.1.13 JP3 –OUTPUT LED When shorted, this jumper connects diode D1 in series with the OUTPUT side of JP2. With the TPS61050's GPIO configured for output, the diode turns on when the GPIO output is low. JP2 must be connected to OUTPUT for this jumper to be effective. This jumper's default position is uninstalled. 2.1.14 JP4 –INPUT: VIN or GND The middle pin of this jumper connects the INPUT side of JP2.
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www.ti.com Setup 2.3 Hardware Setup Table 1 below shows the board's 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's connector J3 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 The software itself performs no calculations or computations and simply reads and writes to and from the IC's four registers through the I2C interface. Each register's bits can either be changed manually by changing the buttons corresponding to each bit in the panel's bottom half or they can be changed through the drop-down boxes and buttons in the panel's top half. Bits or drop-down boxes that are greyed-out are either read (display) only or not operational.
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www.ti.com Test Results 100 LED Efficiency (PLED/PIN) - % 90 ILED = 700 mA 80 70 60 ILED = 300 mA 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 Figure 4.
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www.ti.com Test Results Figure 5.
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www.ti.com Test Results Figure 6. Inrush Current at Flash 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 Figure 7.
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www.ti.com Board Layout Figure 8. Voltage Mode Load Transient 5 Board Layout This section provides the TPS61050/2EVM-215 board layout and illustrations. Board layout is critical for all high-frequency, switch-mode power supplies. Figure 9 through Figure 12 show the board layout for the TPS61050/2EVM-215 PCB. The nodes with high-switching frequencies and currents are kept as short as possible to minimize trace inductance.
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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. HPA215 Bill of Materials COUNT RefDes Value Description Size Part Number MFR 1 C1 1000pF Capacitor, Ceramic, 50V, X7R, 10% 0603 C1608X7R1H102K TDK 2 C2, C3 10µF Capacitor, Ceramic, 6.3V, X5R, 20% 0603 C1608X5R0J106MT TDK 1 0 D1 Diode, LED, Green, Gullwing, GW Type, 20mA, 0.120 × 0.087 7.5 mcd typ. LN1361CTR Panasonic 1 1 D2 LED, White, 350mA 0.166 × 0.
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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.