Texas Instruments LM3429 Evaluation Boards LM3429BSTEVAL/NOPB LM3429BSTEVAL/NOPB Datenbogen
Produktcode
LM3429BSTEVAL/NOPB
V
IN
(V)
EF
F
IC
IEN
C
Y
(%
)
10
15
20
25
30
100
95
90
85
80
User's Guide
SNVA404B – July 2009 – Revised May 2013
AN-1986 LM3429 Boost Evaluation Board
1
Introduction
This evaluation board showcases the LM3429 NFET controller used with a boost current regulator. It is
designed to drive 9 to 12 LEDs at a maximum average LED current of 1A from a DC input voltage of 10 to
26V.
designed to drive 9 to 12 LEDs at a maximum average LED current of 1A from a DC input voltage of 10 to
26V.
The evaluation board showcases most features of the LM3429 including PWM dimming, overvoltage
protection and input under-voltage lockout. It also has a right angle connector (J7) which can mate with an
external LED load board allowing for the LEDs to be mounted close to the driver. Alternatively, the LED+
and LED- banana jacks can be used to connect the LED load.
protection and input under-voltage lockout. It also has a right angle connector (J7) which can mate with an
external LED load board allowing for the LEDs to be mounted close to the driver. Alternatively, the LED+
and LED- banana jacks can be used to connect the LED load.
The boost circuit can be easily redesigned for different specifications by changing only a few components
(see
(see
). Note that design modifications can change the system efficiency for better or
worse. See the LM3429 LM3429Q1 N-Channel Controller for Constant Current LED Drivers (
data sheet for a comprehensive explanation of the device and application information.
Figure 1. Efficiency with 9 Series LEDS AT 1A
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1
SNVA404B – July 2009 – Revised May 2013
AN-1986 LM3429 Boost Evaluation Board
Copyright © 2009–2013, Texas Instruments Incorporated