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
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