LM3414HV Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – 1A 65V LED Driver Evaluation Board Switching frequency: 500 kHz

LM3414HV 1A 65V LED
Driver Evaluation Board
National Semiconductor
Application Note 2076
SH Wong
August 10, 2010
Introduction
The LM3414HV is a 65V floating buck LED driver that de-
signed to drive up to 18 pieces of serial High Brightness LEDs
(HBLEDs) with up to 1000mA LED forward current. With the
incorporation of the proprietary Pulse-Level-Modulation
(PLM) technology, the LM3414HV requires no external cur-
rent sensing resistor to facilitate LED current regulation. The
LM3414HV features a dimming control input (DIM pin) that
allows PWM dimming control. The LM3414HV is available in
LLP-8 (3mm x 3mm outline) and ePSOP8 to fulfil the require-
ments of small solution size and high thermal performance
respectively. In order to demonstrate the performance of the
LM3414 family, the LM3414HV is selected for the evaluation
boards because of the wide input voltage range (4.5V to 65V)
providing the best flexibility to fit the requirements of different
applications. Two versions of evaluation board with identical
schematic are available with the LM3414HV in either LLP-8
or PSOP-8 package. The board with LLP-8 package demon-
strates the high power density of the device. The board with
PSOP-8 package demonstrates the functionality of the
LM3414HV with enhanced thermal performance. The
schematic, bill of materials and PCB layout for the evaluation
boards are provided in this document. The evaluation boards
can be adapted to different application requirements by
changing the values of a few components only. This evalua-
tion board is also suitable for the LM3414 with maximum
acceptable input voltage reduced to 42VDC.
Standard Settings of the LM3414HV
Evaluation Board
Vin range: 4.5V to 65V
No. of LEDs: 1 - 18
LED current: 1A
Switching frequency: 500 kHz
FIGURE 1. Standard Schematic for the LM3414HV Evaluation Board
30128701
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