Thursday, January 17, 2019

PortaLED Budget Edition

Using the spare time I had today I partially assembled a PortaLED PCB, as I had all the parts on hand. This time, I put in a one ohm resistor for the current sense resistor instead of 0.3 ohms to reduce the drive current to make the circuit work with the tiny inductor (which actually had a saturation current of 250mA, while my original design wanted to run at 630mA; I only noted the current rating of 1.9A). I didn't put in the microcontroller and tied the enable pin high. I also didn't put in the battery/USB switchover MOSFET/diode combination out of laziness. I just wanted to test to see if the circuit would work as a basic light and if there was really nothing too wrong about my design from before.

Mostly soldered board.

And it did work!
Assembled.
Stacked boards to form a case.
Plenty bright enough at this drive current. Charger works fine, just don't have it plugged in when on.
This one photo refused to be uploaded by Google Photos.
Not sure why I only get partially uploaded.

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