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LM3509SDEV 产品设计参考手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
开发套件
描述:
TEXAS INSTRUMENTS LM3509SDEV 评估电路板, LM3509, 发光二极管驱动器
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LM3509SDEV数据手册
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SW
IN
OVP
MAIN
SUB/FB
SCL
SDA
GND
VIO
SET
LM3509
CIN
RESET/
GPIO
R_SET
R_GPIO
RESET/GPIO
R_SCL R_SDA
MAIN SUB/FB
IN
GND OUT
COUT
SW
SCLSDA
VIO
VIN/VUSB
USBR
USBL
S_OPEN
M_OPEN
R1R2
L1
D1
D1MD2M
D3M
D4M
D5M
D5S
D4S
D3S D2S D1S
R4
R5
1 3
1 2 3
4
1
2 3
4
1
2
3
4
5
6
7
8
9
10
4/3/2_S
4/3/2_M
1 2
15
16
1
2
15
16
2
GND
User's Guide
SNVA224A–June 2007–Revised April 2013
AN-1594 LM3509 Evaluation Board
1 Introduction
The LM3509 is an asynchronous boost converter with two separate outputs. The first output (MAIN) is a
constant current source for driving up to five series white LED's. The second output (SUB) is configurable
as a constant current source for driving up to 5 series white LED's, or as a feedback input to set a
constant supply voltage for OLED panel power. The maximum LED current per output is set via a single
external low power resistor. An I
2
C compatible interface allows for independent adjustment of the LED
current in either output from 0 to max current in 32 exponential steps. When configured as a white LED +
OLED bias supply, the LM3509 can independently and simultaneously drive a string of up to 5 white
LED’s and deliver a constant output voltage of up to 21V for OLED panels.
The evaluation board is set-up to drive 2 strings of 5 white LEDs (OSRAM, LW_M67C, V
F
= 3.6V at
20mA). These are set-up with 5 LED's in the MAIN string and 5 LED's in the SUB string. Alternatively,
resistors can be installed in the R1 and R2 pads to make the device a voltage output boost converter for
OLED display powering (see Output Voltage Setting (OLED Mode).
Figure 1. LM3509 Evaluation Board Schematic
TI is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
1
SNVA224A–June 2007–Revised April 2013 AN-1594 LM3509 Evaluation Board
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Copyright © 2007–2013, Texas Instruments Incorporated
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