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3.3 VIO VIN
SDASCL
SWUSB2ANY
GND
HWEN
CL
COUT
CIN
VOUT
GND
TX1
SDA
SCL
GND
NTC
STROBE
TX2
RS
VSENSE
TX2
TX1
LEDI/NTC
LED
OUT
GND
HWEN
STROBE
IN
LM3561
GND
VIN
GND
RSDA
RSCL
RHWEN
RSDA
B1
LED
LEDI
(10PF)
(10PF) (10PF)
(Flash LED)
(Red LED)
(4.7k:
(4.7k:
(4.7k:
(Push-Button
(0.1:
L1
(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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1
SNOU103–MAY 2013 AN-2252 LM3561 Evaluation Kit
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