Previous Posts:
TI and Würth Elektronik LED RoadTest+ application and un-boxing - Blog 1 - Nov 10
LED Road Test - Software issues - Blog 2 - Nov 26
LED Road Test - LED PCB issues - Blog 3 - Dec 5
LED Road Test - Some words on timing - Blog 4 - Dec 15
LED Road Test - Launchpad user interface - Blog 5 - Dec 19
Related links:
search for a PCB for Würth power leds
How to solder the LEDs
As mentioned in previous posts I found some nice aluminium LED pcb's on eBay. Here is how they look like, front and back:
LEDs can easily be hand soldered to these boards following those steps:
- apply some solder to the pads, using a normal soldering iron.
- apply a little bit of flux.
- place the LED (be aware of proper polarity, the - is marked on the LED.
- put the PCB on a hot electric (ceramic) cooktop. (be aware that an induction cooktop would not work!)
- wait until the solder melts and the LED sinks onto the board.
- Ready!
Here is a video for clarification:
The final result:
Testing
I also tested the LED, by connecting it to a current source as can be seen in the video below.
The LEDs are rated at 1000mA peak, 700mA continuous. Here is the list of forward current versus voltage, from the video:
| Forward Current [mA] | Forward Voltage [V] |
|---|---|
| 100 | 2.82 |
| 200 | 2.94 |
| 300 | 3.04 |
| 400 | 3.09 |
| 500 | 3.14 |
| 600 | 3.17 |
| 700 | 3.19 |
This more or less matches the specs from the datasheet:
Left measured, right specs from datasheet.
My next blog will describe connection of the LEDs to the TPS92512 EVM, and possibly the LaunchPad.
Stay tuned.
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