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1 Introduction

1.1 Background

User's Guide

SLVU254 – September 2008

TPS62110EVM-346

This user’s guide describes the characteristics, operation, and use of the TPS62110EVM-346 WLED Drive

and Voltage Regulator evaluation module (EVM). The EVM features two independent circuits, one

demonstrates the device as a typical voltage regulator and a second demonstrates the circuit as a current

regulator driving a white LED (WLED). This user’s guide includes setup instructions for the hardware, a

schematic diagram, a bill of materials, and printed-circuit board layout drawings for the evaluation module.

Contents

1 Introduction ................................................................................................................... 1

2 Setup .......................................................................................................................... 4

3 Design Procedure Divider Network ........................................................................................ 5

4 Test Results .................................................................................................................. 6

5 Printed-Circuit Board Layout ............................................................................................... 8

6 Schematic and Bill of Materials ........................................................................................... 11

7 Related Documentation From Texas Instruments ..................................................................... 13

List of Figures

1 WLED Section Efficiency at Iout of 500 mA .............................................................................. 6

2 Voltage Regulator Section Efficiency Versus Vin at Iout of 1 A ....................................................... 6

3 Voltage Regulator Section Efficiency Versus Iout for Vin 6 V and 12 V ............................................. 7

4 Assembly Layer .............................................................................................................. 8

5 Top Layer Routing ........................................................................................................... 9

6 Bottom Layer Routing ...................................................................................................... 10

7 TPS62110EVM-346 Schematic, WLED Section ....................................................................... 11

8 TPS62110EVM-346 Schematic, Voltage Regulator Section ......................................................... 12

List of Tables

1 Performance Specification Summary ..................................................................................... 2

2 TPS62110EVM-346 Bill of Materials ..................................................................................... 13

The Texas Instruments TPS62110 is a synchronous, step-down converter. With a high-switching,

operating frequency of 1 MHz, external components are small; the typical inductor size is 6.8 µ H, and the

overall solutions area is 20 mm × 15 mm. The power switch current limit of 2.4 A provides a typical output

current of 1.5 A across a wide input voltage range of 5 V to 17 V.

The TPS62110EVM-346 uses the TPS62110 in two independent circuits. The U1 circuit is configured as a

current regulator driving a WLED at 500 mA. The U2 circuit is the traditional voltage regulator circuit set to

a 3.3-V output. The EVM operates with full-rated performance at an input voltage between 4 V and 17 V.

Golden DRAGON is a trademark of OSRAM Opto Semiconductor GmbH.

SLVU254 – September 2008 TPS62110EVM-346 1

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Summary of content (15 pages)

PAGE 1
User's Guide SLVU254 – September 2008 TPS62110EVM-346 This user’s guide describes the characteristics, operation, and use of the TPS62110EVM-346 WLED Drive and Voltage Regulator evaluation module (EVM). The EVM features two independent circuits, one demonstrates the device as a typical voltage regulator and a second demonstrates the circuit as a current regulator driving a white LED (WLED).
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Introduction 1.2 www.ti.com Performance Specification Table 1 provides a summary of the TPS62110EVM-346 performance specifications. All specifications are given for an ambient temperature of 25°C. Table 1. Performance Specification Summary Specification Test Conditions U1 Input Voltage Min U1 WLED Current 450 U1 Low Battery Output (LBO) 5 Iout = 10 mA to 1500 mA U2 Output Current 1.3 500 Max 3.267 V 550 mA 0 U2 LBO VIN U2 Power Good (PG) VOUT V 17 3.3 Unit 17 8.
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Introduction www.ti.com U2 can be replaced with the fixed output version, TPS62111 or TPS62112. For this configuration, replace R18 with a 0-Ω resistor, and remove R4 and C3.
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Setup 2 www.ti.com Setup This section describes how to properly use the TPS62110EVM-346. 2.1 Input/Output Connector Descriptions U1--WLED Section J1–LED VIN and LED WLED input voltage source connection. Positive connects to bottom three Vin GND pins, and negative connects to upper three GND pins. J2–LED VOUT and LED GND WLED output voltage connection JP1–SYNC PFM/PWM WLED high forces low-noise PWM mode, low enables power save PFM/PWM mode. Also input for synchronization, if used.
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www.ti.com 3 Design Procedure Divider Network Design Procedure Divider Network The TPS62110 feedback voltage (FB) is set to 1.153 V. If this is used for current regulation, the power dissipation of the sense resistor is high. To reduce the power dissipation on the current sense resistor R10, a reference voltage of 2.5 V is summed resulting in the reduction of the Vsense voltage from 1.153 V to 0.255 V.
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Test Results 4 www.ti.com Test Results Test results using the TPS62110EVM-346 evaluation module are presented in Figure 1, Figure 2, and Figure 3. 100 Efficiency - % 95 90 85 80 75 5 7 9 11 13 VI - Input Volatge - V 15 17 Figure 1. WLED Section Efficiency at Iout of 500 mA 100 Efficiency - % 95 90 85 80 75 5 7 9 11 13 VI - Input Volatge - V 15 17 Figure 2.
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Test Results www.ti.com 100 95 Efficiency - % VI = 6 V 90 VI = 12 V 85 80 75 0 0.25 0.5 0.75 1 1.25 IO - Output Current - A 1.5 1.75 2 Figure 3.
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Printed-Circuit Board Layout 5 www.ti.com Printed-Circuit Board Layout This section provides the TPS62110EVM-346 printed-circuit board (PCB) layout and illustrations. 5.1 Layout Figure 4 shows the board layout for the TPS62110EVM-346 PCB. Figure 4.
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Printed-Circuit Board Layout www.ti.com Figure 5.
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Printed-Circuit Board Layout www.ti.com Figure 6.
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Schematic and Bill of Materials www.ti.com 6 Schematic and Bill of Materials This section provides the TPS62110EVM-346 schematic and bill of materials. 6.1 Schematic Figure 7.
PAGE 12
Schematic and Bill of Materials www.ti.com Figure 8.
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Related Documentation From Texas Instruments www.ti.com 6.2 Bill of Materials Table 2. TPS62110EVM-346 Bill of Materials Count Ref Desig Value Description Size Part Number MFR 4 C1, C8, C10, C11 10uF Capacitor, Ceramic, 25V, X5R, 20% 1206 C3216X5R1E106 TDK 0 C12–C15 Open Capacitor, Ceramic, 1206 Std Std 2 C2, C3 1.
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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.