It would also be helpful to see the original design. A link to the schematic would be enough.
Dave Jones is a lot more knowledgeable than me, and most of the members of this forum. I trust his designs and I would only be interested in the differences between your design and his.
Hi, The Lab power supply was presented at EEVblog #224 - Lab Power Supply Design - Part 1, Part 2 and Part 3 A link is below
He went much further on with this power supply, adding a micro and LCD display etc. but I just need the basics, although it would be nice to have the whole design, but my c coding is poor to say the least, so the basics is just fine.
My dream list is as follows:
Battery powered by (4) 3.7V 2500mAH 18650 cells.
Constant current and constant voltage
Variable from “0” to 10-12V output.
Variable current limit max 1AMP
Separate meter for current and voltage
Indicator when current limit reached
Automatic Battery low level cutoff (So as not to damage the Li-Po batteries)
I'm trying to reduce the Schematic, and will post when done.
I guess my eyes don't make a good benchmark for schematic readability. My eyes are old and tired. Both of those prints look washed out to me. I find the contrast awful. I can barely read the text in the schematic and that's after I've magnified it. After magnifying it I'm back to scrolling it. What CAD - Spice software are you using? Whatever it is it's not eye friendly.
OK, I'm going to repeat a question I asked on the eevblog forums which was never answered...
With the low pass filter on the control input of the LT3080, surely the transient response to changes in load (when the power supply is operating in constant current mode) is going to be poor.
edit: the time constant can;t be better than 22ms by my calculations. If you assume you need between 4 and 5 time constants, then you're looking at around 0.1 seconds. That's a long time if someone accidentally shorts your power supply.