DNO001: Demo Board Power LED´s with Slider

sleuz — Wed, 06 Oct 2021 21:34:47 GMT

Current Revision posted to Documents by sleuz on 10/6/2021 9:34:47 PM

DESIGN NOTE

Demo Board Power LED´s with Slider

Ceramic Power LEDs & LED Driver Module & Wireless

DNO001, BY JAN STEPHAN

1. Introduction

This design note refers to the 158 997 Power LEDs Slider Demo Board. With the LDHM MagI³C Power Module the feasibility of the colored as well as the white ceramic Power LEDs can be demonstrated. To run this board, the user can switch between two modes: the battery mode or via wireless power transfer. In the PCB, a capacitive touch sensor enables the adjustment of the dimming level.

2. Features

Input Voltage:

Power Supply 1: 4 x AAA Batteries = (6 Vin)
Or Power Supply 2: Qi compliant Wireless Power
Or Power Supply 3: external Power Supply (4.5 – 10 Vin)

Output Current:

350 mA (can be adjusted with 2 resistors; refer to table "ILED" on the Board)

Dimming:

15 Dimming Levels @ 4 kHz

White LEDs:

2700 K – 3000 K – 4000 K – 5000 K – 6000 K

Color LEDs:

Red (625 nm) – Yellow (590 nm) – Green (525 nm) – Blue (460 nm)

Wireless Power Receiver Coil:

16,7 μ – IR= 2.0 A (Qi compliant)

Figure 1: 158 997 Demo Board with part descriptions in packaging

3. Description / Manual

Battery Mode:

In order to choose the battery mode, slide the switch to the position "Bat.". To experience the light intensity, push the tact switch next to one of the LEDs on the board and hold it. Simultaneously tap on the touch control panel on the surface of the PCB and the LED will light up. Sliding over this area controls the dimming function. The touch signal is registered by a microcontroller (MCU), subsequently transformed to a PWM signal (15 steps @ 4 kHz) and transmitted to the DIM Pin of the LED driver module. The LED driver controls the dimming level of the LED. After 30 seconds the demo board will turn off automatically. To restart the demo board, tap on the "touch me" area again.

Please Note: Move the slide switch to the WPC position to save energy and avoid an early emptying of the battery.

WPC Mode:

Move the slide switch to the WPC position. Take a Qi compliant WPC transmitter and put the demo board centered above it. The other functions are equal to the battery mode ("Bat.").

4. Bill of Materials

5. Schematics

IMPORTANT NOTICE

The Application Note is based on our knowledge and experience of typical requirements concerning these areas. It serves as general guidance and should not be construed as a commitment for the suitability for customer applications by Würth Elektronik eiSos GmbH & Co. KG. The information in the Application Note is subject to change without notice. This document and parts thereof must not be reproduced or copied without written permission, and contents thereof must not be imparted to a third party nor be used for any unauthorized purpose.

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USEFUL LINKS

Application Notes: http://www.we-online.com/app-notes

REDEXPERT Design Tool: http://www.we-online.com/redexpert

Toolbox: http://www.we-online.com/toolbox

Product Catalog: http://katalog.we-online.de/en/

CONTACT INFORMATION

Würth Elektronik eiSos GmbH & Co. KG

Max-Eyth-Str. 1, 74638 Waldenburg, Germany

Tel.: +49 (0) 7942 / 945 – 0

Email: appnotes@we-online.de

Web: http://www.we-online.com