Texas Instruments LM3431 Evaluation Board LM3431EVAL/NOPB LM3431EVAL/NOPB 用户手册
产品代码
LM3431EVAL/NOPB
VA
VA
VC3 VC2 VC1 VC4 GND THM
board outline
8-pin header
Before Powering Up
Any dimming frequency between 180Hz and 20kHz can be used in either digital or analog dimming control
mode. However the default schematic is not designed for dimming frequencies above 1kHz.Once the
evaluation board has been configured, connect the LED strings as shown in
mode. However the default schematic is not designed for dimming frequencies above 1kHz.Once the
evaluation board has been configured, connect the LED strings as shown in
. The first anode of
each string connects to the VA post and the last cathode of each string connects to VC1 through VC4.
LEDs can be connected either via the 8-pin header or to the terminal posts.
LEDs can be connected either via the 8-pin header or to the terminal posts.
shows the pinout of
the header.
Figure 1. LED Connection, Top View Header Pinout
Connect the input voltage supply to the VIN and GND posts.
When all connections and polarities have been verified, power can be applied. When the input voltage
rises above 7.7V typically, the EN pin will cross the UVLO threshold and the LM3431 will startup. EN can
be pulled low (via the EN post) to shutdown the evaluation board.
rises above 7.7V typically, the EN pin will cross the UVLO threshold and the LM3431 will startup. EN can
be pulled low (via the EN post) to shutdown the evaluation board.
2
AN-1764 LM3431 Evaluation Board
SNVA309A – January 2008 – Revised May 2013
Copyright © 2008–2013, Texas Instruments Incorporated