justDIY Project Log

I’m already up past my bedtime, so just a few pictures for now. Write-up coming soon!

Specs: Input 2v to 6v DC … Output constant current 50mA up to 28v DC
Efficiency: Initial measurements, somewhere around 75%
Chip Texas Instruments TPS61040

size comparison, american quarter dollar piece

circuit detail - design is one-sided PCB with two through-hole jumper wires and the diode, everything else is smt

twin 1uF tantalum capacitors … the output capacitor I had originally selected was limited to 16v, so this was the best I could come up with on a Sunday. Note the top of the coil is missing - these things are fragile!

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This entry was posted on Monday, April 24th, 2006 at 1:12 am and is filed under LEDs, Power, Project, Prototyping. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.