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!
Popularity: 33% [?]
Nice sight, circuit! I need a constant current circuit that outputs 3 Amps continuously.
Scott
August 6th, 2008
Scott, without knowing more details, I’d recommend you check out the HV9910 from Supertex. It has gotta be the most flexible smps controller I’ve seen.
justDIY
August 7th, 2008