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AN24

更新时间： 2024-11-28 01:24:35

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尼得科 - NIDEC		/
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W-6237EVAL2 EVALUATION BOARD FOR W-6237

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APPLICATION NOTE AN24

W-6237EVAL2 EVALUATION BOARD FOR W-6237

HIGH VOLTAGE WHITE LED DRIVER

Denisa Stefan, Applications Engineer

INTRODUCTION

This document describes the W-6237EVAL2 Evaluation Board for the COPAL ELECTRONICS W-6237 white LED

driver. The functionality and major parameters of the W-6237 can be evaluated with the W-6237EVAL2 board.

The W-6237 is a high voltage CMOS constant-current DC/DC converter that has been designed to drive with high

efficiency white or other high brightness LEDs. The high-voltage output stage allows driving up to 10 white LEDs in

series. A single external resistor sets the LED current between 5mA and 40 mA. LED current can be adjusted using

either a pulse width modulated (PWM) signal or a DC voltage. Detailed descriptions and electrical characteristics are

in the W-6237 data sheet.

W-6237EVAL2 BOARD HARDWARE

The evaluation board contains a W-6237 DC-DC boost converter and an array of white LEDs. As configured, the

board circuit is set to drive up to 8 white LEDs in series. The user can chose to connect the W-6237 output to the

LEDs string available on board or to an external LEDs string from an application.

The board provides also the option to connect a different number of LEDs available on board, 6, 7 or 8, using a jumper

shunt for one of the J2 to J4 connectors. The board schematic is shown in Figure 1.

GND

VOUT

LQ1

GND

VIN

33+H

0,22+F

4,7+F

GND

VIN

GND

LED

T10

SHDN

GEN/DC

GND

200K

GND

100 ohm

R510K

W-6237

GND

6,81 ohm

GND

SGND

GND

Figure 1. W-6237EVAL2 Board Schematic

Characteristics subject to change without notice

Document No. 6041, Rev. B

12 3 4 5 6 7...9

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