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User's Guide

SLVU326 – October 2009

TPS61166EVM-446 User's Guide

The TPS61166EVM-446 is an evaluation board to assist in evaluating the TPS61166 IC as a WLED

driver.

Contents

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

2 TPS61166evm Electrical Performance Specifications .................................................................. 3

3 Modifications.................................................................................................................. 4

4 Schematic ..................................................................................................................... 4

5 Connector and Test Point Descriptions ................................................................................... 5

6 Test Setup and Results ..................................................................................................... 6

7 EVM Assembly Drawings and Layout ..................................................................................... 7

List of Figures

1 TPS61166 EVM Schematic ................................................................................................ 4

2 LED Efficiency ............................................................................................................... 6

3 1kHz PWM Dimming with D = 30% ....................................................................................... 6

4 TPS61166EVM-446 Top and Silkscreen (Viewed from Top) .......................................................... 7

5 TPS61166EVM-446 Top Copper ......................................................................................... 8

6 TPS61166EVM-446 Bottom Layer ........................................................................................ 8

List of Tables

1 TPS61166evm Electrical and Performance Specifications ............................................................. 3

2 Bill of Materials ............................................................................................................... 9

SLVU326 – October 2009 TPS61166EVM-446 User's Guide 1

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Summary of content (11 pages)

PAGE 1
User's Guide SLVU326 – October 2009 TPS61166EVM-446 User's Guide The TPS61166EVM-446 is an evaluation board to assist in evaluating the TPS61166 IC as a WLED driver. 1 2 3 4 5 6 7 Contents Introduction ................................................................................................................... TPS61166evm Electrical Performance Specifications .................................................................. Modifications.............................................................
PAGE 2
Introduction 1 Introduction 1.1 Description www.ti.com The TPS61166 is a boost converter with a 20-V rated integrated switch FET and power diode that drives up to 5 LEDs in series. This device integrates a high side switch FET that can turn on/off the LED current within 1-µs of the applied external PWM signal. The high side switch also provides input-to-output isolation during IC shutdown.
PAGE 3
TPS61166evm Electrical Performance Specifications www.ti.com 2 TPS61166evm Electrical Performance Specifications The specifications below are for TA = 25°C unless otherwise specified. Table 1. TPS61166evm Electrical and Performance Specifications Parameter Notes & Conditions Min Nom Max Units INPUT CHARACTERISTICS VIN at J1 Input Voltage JP4 installed tying VBAT = VIN 2.5 6 V VIN at J1 Input Voltage JP4 removed 4.5 10 V VIN_UVLO Input UVLO VIN falling 1.5 1.
PAGE 4
Modifications 3 Modifications 3.1 General www.ti.com To aid user customization of the EVM, the board was designed with devices having 0603 or larger footprints. A real implementation likely occupies less total board space. Changing components can improve or degrade EVM performance. For example, adding a larger output capacitor reduces output voltage undershoot but lengthens response time after a load transient event.
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www.ti.com 5 Connector and Test Point Descriptions 5.1 J1 –VBAT Connector and Test Point Descriptions This header is the positive connection to the input power supply and is tied to the ICs VBAT pin. The user must connect the power supply between J1 and J3 (GND). The leads to the input supply should be twisted and kept as short as possible. The input voltage must be between 1.6-V and 6-V. 5.
PAGE 6
Test Setup and Results 5.9 www.ti.com TP1 – Test Point 1 This test point connects to the IC's VO pin. Since the VO pin is the output of the boost converter before the internal PWM dimming switching, the user can monitor the boost converter output and, for example, confirm that the over voltage protection circuit properly clamps the output voltage if the LEDs are removed from the output. 5.
PAGE 7
EVM Assembly Drawings and Layout www.ti.com 7 EVM Assembly Drawings and Layout Figure 4 through Figure 6 show the design of HPA446, the TPS61166EVM's printed circuit board. The EVM has been designed using a 2-Layer, 1oz copper-clad, 2 inch x 2 inch circuit board. Figure 4.
PAGE 8
EVM Assembly Drawings and Layout www.ti.com Figure 5. TPS61166EVM-446 Top Copper Figure 6.
PAGE 9
EVM Assembly Drawings and Layout www.ti.com 7.1 Bill of Materials Table 2 lists the EVM components as configured according to the schematic shown in Figure 1. Table 2. Bill of Materials Count RefDes Value Description Size Part Number MFR 1 C1 4.7µF Capacitor, Ceramic, 6.3V, X5R, 20% 0603 Std Std 1 C2 0.1µF Capacitor, Ceramic, 25V, X5R, 20% 0603 Std Std 1 C3 0.1µF 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.