Electronics > Beginners
Having problems with a step up converter
Moriambar:
--- Quote from: spec on December 02, 2018, 02:34:45 pm ---Don't be offended by the following basic questions/procedures- I am not trying to tell grandma how to suck eggs, but it is always worth checking/testing.
--- End quote ---
Never offended by someone genuinely offering to help. Thanks
--- Quote ---BENCH PSU
[1] Are you sure that the current limit on the power supply is set to max?
[2] We once has a bench PSU that used to momentarily output 35V at turn on. It blew quite a few units randomly before we found out what was going on.
[3] I have experienced strange results with sophisticated PSUs and some equipment. Have you got another simpler PSU or a decent battery: LiIon would be good.
[4] There may be something about the lab PSU turn-on voltage profile that the boost converter does not like.
[5] Remove the boost module positive lead from the lab PSU. Turn the lab PSU on and set the output voltage to 6V and the current limit to max. If there is a current fold-back selector on the lab PSU turn it to off.
[6] While the lab PSU is still on, touch the positive lead of the boost converter positive to the positive terminal of the PSU.
--- End quote ---
1-> yep.
2-> that's not the case, I think: I've been using the PSU for more than a year now (scored it from my boss, long story) and I never noticed anything wrong. It should've blown up something else if that were the case. It's superstable, for my applications, never ever had a problem with it.
3-> this is not sophisticated, it's basically three dials. I do not own another PSU, although I wanted to build one of my own, but the project is lagging… long story short it's either that, a 12V transformer or any reasonable (<20) amount of AA. I never used LiIon batteries and I certainly do not plan to buy one just to test the boost converter
4-> could be although it feels strange. With oscilloscope I probed a bit the PSU for fun but there's nothing wrong imo
5-> ok
6-> if I touch the converter the out voltage varies. If I keep it attached long enough (1-2s?) the output voltage flattens at around 0.1V below the PSU, as usual.
--- Quote ---NEW BOOST CONVERTER, NEW POWER SOURCE
[1] Get a new boost converter, or at least one that definitely has never been connected to the bench PSU
[2] Connect a 220 Ohm, or there about, resistor across the output of the boost module.
[3] Connect a 2uF or greater low-loss capacitor directly across the input of the boost converter.
[4] Connect a 2uF or greater low-loss capacitor directly across the output of the boost converter.
[4] Connect the boost converter to a 5V to 9V DC source (not the bench PSU). An 18650 LiIon battery would be ideal.
Let us know how you get on. :)
--- End quote ---
I did not try thid because I do not own another PSU as told above.
Thanks for your help
spec:
No probs. :)
dboris:
I got the same problem on 10 models.
FB output is missing :
Fix :
Fix with new pcb :
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