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3.3 VIO VIN

SDASCL

SWUSB2ANY

GND

HWEN

COUT

CIN

VOUT

GND

TX1

SDA

SCL

GND

NTC

STROBE

TX2

VSENSE

TX2

TX1

LEDI/NTC

LED

OUT

GND

HWEN

STROBE

LM3561

GND

VIN

GND

RSDA

RSCL

RHWEN

RSDA

LED

LEDI

(10PF)

(10PF) (10PF)

(Flash LED)

(Red LED)

(4.7k:

(Push-Button

(0.1:

(1PH)

User's Guide

SNOU103–MAY 2013

AN-2252 LM3561 Evaluation Kit

1 Introduction

The LM3561 is a 2-MHz fixed-frequency current-mode synchronous boost converter. The device is

designed to operate as a single 600-mA constant current driver for high-current white LEDs. The high-side

current source allows for grounded cathode LED operation while the 250-mV regulated headroom voltage

ensures that the LED current is well regulated and efficiency remains high.

The LM3561EVM is designed to fully evaluate the LM3561 Boost Converter + White LED Camera Flash

LED driver. The board comes populated with a single Flash LED (LXCL-EYW4 from Lumileds), and an

indicator LED (LEDI). For each input/output of the LM3561 there is a dedicated header pin for testing

purposes. The LM3561EVM is included with a USB2ANY Module which interfaces the LM3561EVM with

the downloadable Graphical User Interface (LM3561.exe GUI) available at (www.ti.com).

Figure 1. LM3561 Evaluation Board Schematic

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SNOU103–MAY 2013 AN-2252 LM3561 Evaluation Kit

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Summary of content (9 pages)

PAGE 1
User's Guide SNOU103 – MAY 2013 AN-2252 LM3561 Evaluation Kit 1 Introduction The LM3561 is a 2-MHz fixed-frequency current-mode synchronous boost converter. The device is designed to operate as a single 600-mA constant current driver for high-current white LEDs. The high-side current source allows for grounded cathode LED operation while the 250-mV regulated headroom voltage ensures that the LED current is well regulated and efficiency remains high.
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LM3561 Evaluation Board Bill of Materials 2 LM3561 Evaluation Board Bill of Materials Component Symbol 3 www.ti.com Value Manufacturer Part # Size LM3561 LED Driver TI LM3561 (0.4 mm × 1.215 mm × 1.615 mm) L1 1 µH, IDC_MAX = 2.15A, RL = 80mΩ TOKO MDT2012-CR1R0N (2 mm x 1.25 mm x 0.9 mm) CIN 10 µF, 6.3V TDK C1005X5R0J106M 0402 (1mm x 0.5 mm x 0.5 mm) COUT 10 µF, 6.3V TDK C1005X5R0J106M 0402 CL 10 µF, 6.3V TDK C1608X5R1A106M 0603 (1.6 mm x 0.8 mm x 0.8 mm) RHWEN 4.
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LM3561 Evaluation Board Layout www.ti.com Figure 3. Mid Layer 1 Figure 4.
PAGE 4
LM3561EVM Set-Up www.ti.com Figure 5. Bottom Layer 4 LM3561EVM Set-Up To operate the LM3561EVM the following steps must be taken: 1. Download the LM3561 Graphical User Interface (GUI) from www.ti.com. The downloaded .zip folder consists of 2 files: the LM3561.exe and the USB2ANY.dll. The .zip file must be copied and the files extracted to a folder on a PC. Both files must reside in the same folder. 2. Ensure there is a jumper connected from VIO to VIN or from VIO to 3.3V.
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LM3561 GUI www.ti.com 6 LM3561 GUI Figure 6. LM3561.exe GUI 7 LM3561 Register Descriptions Table 1. Enable Register Bit Settings Bits[7:3] Bit 2 Bits [1:0] Not Used (Strobe Level or Edge, STR bit) Enable Bits N/A 0 = STROBE Input set for Level. Flash current turns on when Enable Bits STROBE input is high and turns off when STROBE either goes 00 = Shutdown (default) low or the Timeout Duration expires (default) 01 = Indicator Mode 10 = Torch Mode 1 = STROBE Input set for edge triggered.
PAGE 6
LM3561 Register Descriptions www.ti.com Table 3.
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LM3561 Register Descriptions www.ti.com Table 6. Flash Brightness Register Bit Settings Bits [7:4] Bits [3:0] Not Used N/A Flash Current Settings 0000 = 36 mA 0001 = 73.6 mA 0010 = 111.2 mA 0011 = 148.8 mA 0100 = 186.4 mA 0101 = 224 mA 0110 = 261.6 mA 0111 = 299.2 mA 1000 = 336.8 mA 1001 = 374.4 mA 1010 = 412 mA 1011 = 449.6 mA 1100 = 487.2 mA 1101 = 524.8 mA (default) 1110 = 562.4 mA 1111 = 600 mA Table 7.
PAGE 8
LM3561 Register Descriptions www.ti.com Table 8.
PAGE 9
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.