Products > Test Equipment
DP100 PD-Power Supply 100Watt [0-30.00V / 0-5.000A) [∼50$]
DaneLaw:
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Very interesting find, Dexter2..I have two of these from around half a year back and didn't notice any fundamental issues when I got them and briefly tested them.. biggest con was the second unit and roller were not as smooth as the first in its clickable hardware feedback.. it feels like its spring leaf that are clicking while rolling are not aligned correctly, and simply too far ahead.
But all my use-cases with them, are from power banks and that could be why I'm not seeing it, if it's only when you hooked through your AC grid with an AC-DC PD wall-outlet that your getting these negative spikes..?
All your negative spikes were obtained when running it from an AC to DC PSU PD Wall outlet.?
They are quite input willing..Even the crude/standard 5V USB-A with a single 18650 will work, and also PD (power delivery) 5v, 9v, 12, 15v, 20v, but could also look like Qualcomm (QC) 5v, 9v, 12v are supported.
You can also run them from 28V / 5A PD3.1 power banks, like I did above, but you need to trigger before the DP100, as they don't have PD3.1 (28v/5A) trigger naively (not many items have that protocol yet, mostly higher-end laptops from fx Apple, but the PD3.1 chip doesn't cost a lot if you wanna do it yourself on a cable... its like 1½ or 2 bucks with a TypeC female connected... got a couple of them.. it also support 48v, but there are no items that sofar takes advantage of PD 48v.. so its mostly the 28v/5A that are activated from scratch in that chipboard.. the up to 48v needs that you unsolder a made bridge for another to activate that on the PD3.1 board.
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Dexter2:
--- Quote from: DaneLaw on March 29, 2024, 06:25:31 pm ---But all my use-cases with them, are from power banks and that could be why I'm not seeing it, if it's only when you hooked through your AC grid with an AC-DC PD wall-outlet that your getting these negative spikes..?
All your negative spikes were obtained when running it from an AC to DC PSU PD Wall outlet.?
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Yes negative spikes are only there if powered from AC PD wall outlet and then the load connected to the DP100 is light and ground referenced. For me this is the most common use case i wanted to use the PSU in my lab. If you want to repeat my findings you will see the spikes if you just connect your DP100 to a AC PD wall outlet and connect a standard table oscilloscope to the output of the DP100. The spikes appear when you disable the output.
When the DP100 is powered with a battery bank and not connected to a PC there should be no issues. Also if you power a load that has a lot of capacitance itself or has high power draw (more than few 10mA) there also should be no issues.
Its a nice small power supply. If they only would make it to internally disconnect the positive rail and natively support PD3.1 it would be perfect :)
DaneLaw:
Video with tear down..
Dave is quite impressed by this tiny little fellow, that a viewer shipped him in the mail back.
He seems pretty bamboozled that they can sell a product like this at these prices.
Impressive value for the money but also emphasize that if you running it from a third-party AC wall PSU you can transfer noise etc from those devices..
- as there are limits for how much filtering that gonna be in this tiny fellow to clean what is coming in..
but its performance is quite impressive, not least with the price in mind.
Phil1977:
Thanks a lot for the output schematics!
The Low-side-switch seems really annoying. Do I get it right that if you use this unit e.g. with a vehicle grid source and its output is switched off then power can still flow "around" the low-side-FET if the connected load has any additional mass-connection? That sounds like a problem source directly from hell >:D
Another issue I see with this setup that is common with many other small adjustable SMPS: There´s a lot of output capacitance that seems to be *behind* the current regulation. This easily kills e.g. LEDs or even Laser Diodes if you ever connect the load to the switched on PS.
Anyhow, it seems to be a sexy device as long as you know about its limitations...
Hydron:
I'm wondering if the low side switch thing could be worked around with a minor hack - if the positive terminal is fused by that smd component on the bottom of the board (and isn't connected to anything else), could the fuse be replaced by a high side MOSFET driven by the same signal as the low side one? Would need some level shifting but there's likely an integrated part available to make it simple, and add back current limiting too if the fuse isn't replaced.
Kinda regretting not grabbing one during the AliExpress anniversary sale - this issue put me off but that was before the later posts with explanation of the cause and Dave's review.
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