Texas Instruments LM3423 Evaluation Board LM3423BBLSCSEV/NOPB LM3423BBLSCSEV/NOPB 数据表
产品代码
LM3423BBLSCSEV/NOPB
V
IN
(V)
EF
F
IC
IEN
C
Y
(%
)
100
95
90
85
80
75
70
0
16
32
48
64
80
Q1 is IPD200N15N3
Q1 is FDD3682
User's Guide
SNVA415C – June 2010 – Revised May 2013
AN-2010 LM3423 Buck-Boost 2 Layer Evaluation Board
1
Introduction
This wide range evaluation board showcases the LM3423 NFET controller used with a buck-boost current
regulator. It is designed to drive 4 to 8 LEDs at a maximum average LED current of 700mA from a DC
input voltage of 10 to 70V.
regulator. It is designed to drive 4 to 8 LEDs at a maximum average LED current of 700mA from a DC
input voltage of 10 to 70V.
The evaluation board showcases most features of the LM3423 including PWM dimming, fault and LED
status flags, output overvoltage protection and input under-voltage lockout. Note that there are two
revisions of this PCB. The documentation for the latest revision (551600305-002 RevA) is shown first. The
schematic, layout and bill of materials for the first revision (551600305-001 Rev1) can be found at the end
of this document.
status flags, output overvoltage protection and input under-voltage lockout. Note that there are two
revisions of this PCB. The documentation for the latest revision (551600305-002 RevA) is shown first. The
schematic, layout and bill of materials for the first revision (551600305-001 Rev1) can be found at the end
of this document.
The buck-boost circuit can be easily redesigned for different specifications by changing only a few
components (see the
components (see the
section found at the end of this application note). Note that design
modifications can change the system efficiency. See the LM3421/21Q1/21Q0 LM3423/23Q1/23Q0 N-Ch
Controllers for Constant Current LED Drivers (
Controllers for Constant Current LED Drivers (
) data sheet for a comprehensive explanation of
the device and application information.
Figure 1. Efficiency with 6 Series LEDS at 700mA
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1
SNVA415C – June 2010 – Revised May 2013
AN-2010 LM3423 Buck-Boost 2 Layer Evaluation Board
Copyright © 2010–2013, Texas Instruments Incorporated