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AN32

更新时间： 2022-02-26 14:25:53

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尼得科 - NIDEC		/
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10-LED Boost Converter

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Application Note 32

W-6238EVAL1 Evaluation Board for W-6238

10-LED Boost Converter

Denisa Stefan, Applications Engineer

1. INTRODUCTION

2. W-6238EVAL1 BOARD HARDWARE

This document describes the W-6238EVAL1

Evaluation Board for the COPAL ELECTRONICS

W-6238 High Efficiency 10-LED Boost Converter.

The functionality and major parameters of the

W-6238 can be evaluated with the W-6238EVAL1

board.

The evaluation board contains a W-6238 DC-DC

boost converter in a typical application circuit. As

configured, the board circuit is set to drive up to 10

white LEDs in series. The user can chose to connect

the W-6238 output to the on-board LEDs string or to

an external LEDs string from an application.

The W-6238 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 characte-

ristics are in the W-6238 data sheet.

The board provides the option to connect a different

number of LEDs available on board, 8, 9 or 10, using

a jumper shunt for one of the J2 to J4 connectors. The

board schematic is shown in Figure 1.

OUT

GND

LQ1

47µH

4.7µF

0.22µF

GND

L10

VIN

LED

T10

W-6238

SHDN

GEN/DC

GND

200k

GND

100

R5 10k

6.81

SGND

Figure 1. W-6238EVAL1 Board Schematic

Characteristics subject to change without notice

Doc. No. 6050 Rev. A

12 3 4 5 6 7

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