DP100 PD-Power Supply 100Watt [0-30.00V / 0-5.000A) [∼50$]  - Page 1
Forum section: electronics / testgear

author: DaneLaw
author_rank: Frequent Contributor
timestamp: December 01, 2023, 07:34:07 pm
content: Has anybody tried this small power supply that resamples the Miniware MDP series quite a lot. .?It's tiny, at around 10cm in length 1½cm high, and 6cm deep, but looks quite feature-rich, with 4mm banana jacks fitted with corresponding red/blue ring lights when power is active, TypeC with fastcharge protocols like PD3, USB-A for peripherals like mouse-control, also seems to have a PC interface.It could be a good fit with these modern high-wattage PD3.0 and PD3.1 power banks as a small mobile solution.In transit and should arrive in the next week - A small switching alternative to the two bulky old linear Korad PSUs I got, which are cumbersome to pull out, and set up with PC control.Features**DP100 CNC power supply is a high-performance CNC adjustable DC power supplyPower supply mode Support PD/QC fast charging source, universal DC power adapter, charging treasureSupport 10 groups of preset output, directly call outThe power-on curve is smooth and stable without overshootHardware constant voltage constant current circuit, intelligent anti-burning, constant voltage constant current mode automatic switchingThe input supports reverse protection and undervoltage protectionThe output supports overvoltage protection, overcurrent protection, overload protection, overheat protection and reverse protectionUSB-A interface slave mode (USBD) supports communication with the host computerUse 0.96 inch 160*80 HD IPS screen to display and control panel humanized Angle design, easy to operateSize: 10.4cm*6.2cm*1.72cmInput voltage: DC5V~32VOutput voltage: 00.00V~30.00V, resolution 0.01V continuously adjustableOutput current: 0.000A~5.000A, resolution 0.001A continuously adjustableOutput power: ≤100WConversion efficiency: ≤97%Input interface: Type-COutput interface: 4.0mm banana head interfaceFast charge protocol: PD/QCScreen: 0.96TFT (160*80Pixel, IPS)**PC software that seems to have english support..A look inside (+4.10min)

author: YTusername
author_rank: Regular Contributor
timestamp: December 29, 2023, 03:33:06 pm
content: Hi,Any chance you tried it?I'm looking to order one too.There is a review video (Japanese / subtitle available). It seems very good for the price.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: December 29, 2023, 08:53:08 pm
content: Quote from: YTusername on December 29, 2023, 03:33:06 pmThey first arrived today, and its orders from Singles Day nov-purchase in one of Aliexpress's so-called "fast combined-shipment" where they will try to bundle it with numerous of your other orders from those weeks, but December month is a heavy shipping month, and the delay is likely down to our local PostNord that will gladly let your China parcel linger locally for weeks' before they will deliver it.So I haven't actually tried it to any real extent, only a brief visual look today on one of them... its very Tiny..The possible add-on "100W TypeC" cable comes in a separate box and the embedded chip in the cable reads it as "20V / 5A - USB3.2 gen2"Overall it's a nice 100W 150cm TypeC-to-TypeC silicone cable with good lock-indents.The black & red casing also looks pretty good with a riffled ingrowed surface-texture, though it has quite a fabrication smell to it, so it's on the balcony sprayed with some Rodalon so hopefully the smell will be a saga.The incl. 4mm banana to crocodile clips are goldplated in both ends with silicone wires.(16awg 200 degrees rated)Here at first glance, the DP100 unit looks good - and seems to match the description, the knurled metal roller, sadly aint clickable so you validate/enter with the front buttons.The incl. manual does cover English, foldable with one side CN and the other ENG.(10 pages)// with the price in mind, it looks like a nice unit (sofar) but also precuriously cheap, so still waiting to see where the cat is buried(vers. 1.4_1.4)

author: YTusername
author_rank: Regular Contributor
timestamp: January 01, 2024, 01:28:40 pm
content: Nice shoots! ThanksQuote from: DaneLaw on December 29, 2023, 08:53:08 pmI think the price is reasonable. I know it is generally cheap, but the RD60xx serise has more features and prooved performance with arround 64-112$ based on PSU and case selection.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: January 02, 2024, 01:49:04 am
content: The RuiDeng units, It's another fish, nobody would pursue Atomics DP100 or Miniware MDP-series, for PSU purposes, if size benefits weren't critical, then you would go with a full fledge bench PSU, if mobility & size weren't a crucial factor.Sure' you can get a Ruideng control PSU panel for relatively small funds, but its two very different-sized products in build and design, the DP100 its tiny, to the point that many would see that tinyness as a con, if the tiny size wasn't something they needed.Here in my taxed northern region, RuiDengs RDxxxx products are from. 130USD for what looks to be a barebone RD6012 frontboard (no wifi) and up, incl. enclosure-backcase it's 170 to 180USD and then you can add a PSU..https://aliexpress.com/item/1005003472332331.html?Already have two linear Korads-P unitshttp://tinyurl.com/28upwfreand they are bulky as, (just like linear PSUs tend to be for the linear benefits) and certainly not mobile, and it's the small form factor in fx DP100 that is so easy to just pull out on your desk or outside, and attach with a high wattage power bank, that appeals to me, not least to running high powered 9mm laser diodes, as im fascinated by light, and particularly coherent wavelengths, where many of the high power lazing diodes nowadays are quite resistant to switching PSUs.DP100 48 USD (incl. 25% EU-VAT and delivery) but it is a sale price (BF/SD sale) where Aliexpress eats a good chunk of the price & takes it down a nudgehttp://tinyurl.com/mupskyjuBeen very close to take the plunge on the Miniware variant since it came out "MDP-X" fx 905 but the more I looked into it, the more limited it seemed hence the choices Miniware had gone with, though Miniware did try to counter some of the shortcomings with later revisions, not least protocols.The fanless MDP P905 (90W) which in the standalone version costs around (160USD) though P905 discontinued now, for a beefier variant P906 (220USD / Eleshop) which is now also holding a tiny hysteric fan (not dat creazy about that) likely a must in such a small form factor, being able to reach 10A.I'm not familiar with other alternatives, then the Miniware MDP PXXX variant and then the DP100 from Punctual Atomic, all other units seem to be in another adj. PSU category, also RuiDeng units.So far I do like the protocol approach in the DP100, as you have quite big control over the power delivery/PD and Qualcomm protocols when supplying power.PD (to a type C PD socket) you can cycle at will in the DP100 menu, 9v, 12v, 15v, 20v, and your power bank or PSU will adjust accordingly on the fly.Qualcomm quick charge (when using power from a standard USB-A port) you can cycle between 9v and 12v.Tried with an Anker737 power bank (PowerCore24). it got 2x TypeC (PD3.1) and 1 USB-A (QC support).. the 2 TypeC sockets would cycle 9v, 15v, 20v (this 737model PB doesn't support 12v PD) and running it from the USB-A port would let me choose between 9v and 12v (QC)You can always just supply ordinary non-protocol power, to get above 20v, as the unit doesn't support PD3.1 which opens up for fx 28v/5A (140W) DP100 got PD3.0 as far as I can tell, that maxes out at 5A 20v (100w)The Anker737 power bank supports PD3.1 and 140watt of each of the 2x TypeC sockets, so I attached a PD3.1 28V 5A decoy/trigger cable, so the power bank triggers 28v-power delivery out (PD), and that works fine, gives you 28v input on the DP100, - the DP100 is solely buck'ed, so your max will be around 1v lower than your input.If you dont wanna rely on protocols, you can obviously also do that, fx from a barrel DC, as it comes with a DC-barrel to TypeC adapter that does seem quite beefy hence the metal in the small cable part, likely rated for the 100W.Tested to see if it overshooted and to what extent...tested when turning the device on & off, and tested when turning the output on & off..could look like there is some when turning the output off (peaks with +0.4v from 15v output, a brief spike to 15.4v before dropping), and when turning the DP100 on manually with the left button, the same spikes with around +0.4v to 0.400mv before centering. (not the actual output, solely the device on) but there are quite many variables, as you can also set it to turn on aut when connecting the power bank (was using the 737 Powercore24)...Will try to hook one of these on the input from the power bank to see what it gets in.

author: Dexter2
author_rank: Contributor
timestamp: March 27, 2024, 03:16:59 pm
content: The positive:As others have mentioned the power supply is exceptional small, the images on the internet do not do it justice, only when you hold it in your hand you grasp how small it is. The build quality is exceptional, also the accessories are of high quality. The device output voltage is spot on. It agrees in a range of few 100uV to a precision calibrated 7 1/2 DMM. Everything is excellent up to this point. It's also power efficient. When loaded with full 5A @12V it only heats up to 40°C.Neutral:User interface navigation is a bit non logical, but when you get the hang of it its OK. I was not able to get it to trigger a PD3.1 USB-C power supply to output 28V. So it seems that up to now only up to 20V input is supported over USBC PD protocol. This is a shame as having the power supply to output 24V is beneficial for lot of projects, as most of the industrial electronics is powered by 24V. This is something to consider and i hope could be fixed with a firmware update.Negative:From measurements on my received unit i would not recommend using it for sensitive electronics with an external USBC PD power supply. When output is disabled, there are output spikes that go to about -8V. This happens if there is a light load connected that does not have blocking diodes. I tested with two USB-C power supplies, a PD3.0 one and a PD3.1 one. This probably could be fixed with firmware as i did not observe this problem when powered from a standard external 30V power supply. But having such a small laboratory power supply the number one usage case is you pair it with a small GaN USB-C PD power supply.12V Output ON (Light load with LED + Resistor) using USBC PD3.1 power supply12V Output OFF (Light load with LED + Resistor) using USBC PD3.1 power supplyWill test more around this problem in the next days. Has anybody seen this same issue with their PD100?12V Output OFF (Light load with LED + Resistor) using laboratory power supply as source set to 30V.

author: YTusername
author_rank: Regular Contributor
timestamp: March 28, 2024, 06:22:57 am
content: Quote from: Dexter2 on March 27, 2024, 03:16:59 pmThis confirms what DaneLaw reported too. PD3.1 is not supported.Quote from: Dexter2 on March 27, 2024, 03:16:59 pmDoes it have negative spikes behavior when being fed a 5V USB power supply?

author: Dexter2
author_rank: Contributor
timestamp: March 28, 2024, 12:27:21 pm
content: I continued my investigation with no positive results.I tried various USB-C cables and 5 different USBC power supplies ranging from 35W to 140W. Even tried a standard 5V USB power supply the result was the same. I even tried to measure the output with an Keysight InfiniVision osciloscope if there was some strange ground loop interaction with my R&S scope but the result was the same.DP100 output when its disabled over the on screen ON/OFF button. Power source was a USB 5V power supplyNo load on output!DP100 output when its disabled over the on screen ON/OFF button. Power source was a USBC PD3.0 power supplyNo load on output!DP100 output when its disabled over the on screen ON/OFF button. Power source was a USBC PD3.0 power supply10K as loadDP100 output when its disabled over the on screen ON/OFF button. Power source was a USBC PD3.0 power supply470R as loadDP100 output when its disabled over the on screen ON/OFF button. Power source was a Keysight low noise loaboaratory PSUNo LoadSo what this shows is that the DP100 sadly has some internal problems when the output is disabled, and it starts to output noise that can be in almost -8V range with no or light load on the output when using USBC as power source for it. Even when its powered with a super low noise power supply some noise can be observed when you disable the output. Using a load resistor always connected to the output solves the problem to some degree but the output current measurement is than not correctly displayed on the screen anymore. So i would say a shame as otherwise its quite precise and low noise as long you do not disable the output... So for high current loads like motors, battery charging or loads that draw >100mA its a fine small power supply. But for sensitive low power electronics it has problems to the point you can damage the circuit you are powering with it when using USB power as source...

author: Phil1977
author_rank: Frequent Contributor
timestamp: March 28, 2024, 12:39:01 pm
content: Just my first thought: Why not add a diode antiparallel to the output? If I see the traces below, it should prevent the worst part of the behaviour.My second thought. Why is this diode not integrated in the design? Cost is neglectible but it can prevent a lot of damage when the power suppy is accidentaly backfeeded.

author: Dexter2
author_rank: Contributor
timestamp: March 29, 2024, 05:44:58 pm
content: I took it apart and it was immediately apparent why the strange behavior when you disable the output of DP100.There is quite a bit of capacitance on the output 1600uF in total to be exact (3x220uF + 2x470uF). So disabling the output BUCK regulator would take some time for the capacitors to discharge, and probably the engineers wanted the output to be disable instantly so they added and MOSFET on the output. But to save money they used n N-Type MOSFET on GND.This creates issues when you have ground referenced electronics, witch most of electronics is even if its battery powered you ground it during development when you connect an oscilloscope, function generator or any measurement equipment... And then the DP100 performs as seen on my measurements when you disable the output. All AC-DC power supplies are capacitive coupled and designed in a way that the output is clean when output negative is connected to ground or protective earth. ALIENTEK PD100 disconnects this connection so depending on the power supply type you get large mains frequency noise on the output.In my opinion the only use case for this power supply to work reliable is to use it with battery power like a power bank without USB PC connection. If connected to a PC for control over the supplied software, it will again have ground related problems...It seams their engineers thought of this problem and wanted a capacitor on the output to couple this AC mains noise during output OFF, but there was mechanically no room for it when assembled, as the output terminals are in the way so this got removed in the final design. So i now added a small 4.7uF MLLC one. Its enough to reduce the output noise to about 200mVpp when output is disabled.So with this capacitor added Batteries can still be charged and will not discharge when output OFF, there is still polarity protection at least as long the output is OFF and the main current path is interrupted not to discharge the whole 1600uF into the attached load when Power OFF is pressed. But its only a quick Fix as still there is a possibility of unwanted current flow into your attached load. They really should interrupt the positive terminal.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: March 29, 2024, 06:25:31 pm
content: Quote from: Dexter2 on March 29, 2024, 05:44:58 pmVery 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.

author: Dexter2
author_rank: Contributor
timestamp: March 29, 2024, 07:51:07 pm
content: Quote from: DaneLaw on March 29, 2024, 06:25:31 pmYes 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

author: DaneLaw
author_rank: Frequent Contributor
timestamp: March 29, 2024, 09:12:34 pm
content: 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.

author: Phil1977
author_rank: Frequent Contributor
timestamp: March 30, 2024, 11:42:17 am
content: 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 hellAnother 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...

author: Hydron
author_rank: Super Contributor
timestamp: March 30, 2024, 01:52:58 pm
content: 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.

author: Dexter2
author_rank: Contributor
timestamp: March 30, 2024, 08:35:01 pm
content: I was thinking the same to make a small piggyback PCB that would connect to the Fuse terminals and use the control signal for the low side MOSFET to control an high side P-Channel MOSFET on positive terminal. There are no connections after the fuse as far i have seen. But this solution would need as you mentioned level shifting and a negative voltage generator to proper open the P-Channel MOSFET also when the output voltage is set below a few V. Not a problem to make but there is not a lot of space available for the piggy-back... Will see if i find a integrated solution that would be small enough to fit. If i find something appropriate i will share my findings.As for the current regulation, yes it's slow no way to connect a LED with output ON without a bangBut this is true for most switching power supplies that do not have linear post regulation. For this price i thing its an OK tradeoff... It was a better choice to make it low noise but slow than to make it fast and noisy. But probably they could have reduced the output capacitance to at least half with same noise performance by using an LC filter on output and not only capacitors as now...

author: Dexter2
author_rank: Contributor
timestamp: March 30, 2024, 09:29:27 pm
content: First idea... Will see if it fits...

author: Hydron
author_rank: Super Contributor
timestamp: March 30, 2024, 10:53:13 pm
content: Something like this could simplify the circuit (only needs a couple of 100n caps and N-ch MOSFET), though it would need 5V for Vcc rather than 3V3:https://www.analog.com/media/en/technical-documentation/data-sheets/ltc7004.pdfIs the USB-A port on the unit always on? That could provide a 5V supply.There may of course be other better options out there (something that's easier to dead-bug than a 10 pin MSOP and runs on 3V3 would be nice).

author: Dexter2
author_rank: Contributor
timestamp: March 30, 2024, 11:00:29 pm
content: Nice chip this LTC7004. Wil investigate if there is an internal 5V rail that is always on...Update: Internally there is a 5V rail that is always present.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: March 31, 2024, 03:09:37 am
content: You can also control it from a browser fx Chrome.As it supports WebHIDVideo belowWorks from a browser link, no program installment.. its from the same fellow that made the open-source input device "Smartknob" with millions of views, that went viral some time back.He seems to be quite fond of his DP100 purchase.. impressive value for the price.Open source SmartKnob..WebHID DP100Works like a charm.. no programs needed.. just open this link and connect.https://scottbez1.github.io/webdp100/Relevant githubGitHub:https://github.com/scottbez1/webdp100

author: DaneLaw
author_rank: Frequent Contributor
timestamp: March 31, 2024, 04:44:02 pm
content: Dynamic Acoustic Vibration Effect, or just DAVE for short (patents filed 1-4-24)Riding the subharmonics.

author: Dexter2
author_rank: Contributor
timestamp: March 31, 2024, 09:21:32 pm
content: Designed the update PCB. Should fit nicely to the output capacitors and terminals and will need only two additional small wires. I will upload Gerber's after i test it, if someone else wants to update their DP100. At the end i decided for the more passive solution as its lot cheaper then the LTC7004.

author: Phil1977
author_rank: Frequent Contributor
timestamp: April 01, 2024, 08:12:10 am
content: Maybe a stupid question, I´ll anyhow speak it out: May anyone imagine putting a small 5A capable relais into the output? Combination of the integrated Low-Side-FET-Switch with a High-Side-Relais feels like a no-brainer-solution for me, but is there by any way enough room for it? I´ll receive my own unit in a around 2 weeks...

author: Dexter2
author_rank: Contributor
timestamp: April 02, 2024, 12:00:12 pm
content: Quote from: Phil1977 on April 01, 2024, 08:12:10 amThere may be enough room for a super miniature relay on the top of the PCB where the caps and the main inductor is if its 10mm high it maybe would fit. But anyhow it would be hard to assemble as you would need more wires that go to the other side and would also need to cut the negative trace from the on board MOSFET to the output, probably better to use an extra SOT-23 Mosfet for relay control. It would not be a simple clean solution but doable without the extra mini PCB.

author: kloetpatra
author_rank: Regular Contributor
timestamp: April 02, 2024, 12:36:58 pm
content: I think these are the smallest you can get for 5A: 10 * 6 * 5.65 mm (l*w*h)https://www.mouser.de/ProductDetail/TE-Connectivity-PB/IM03DGR?qs=g%252BEszo6zu8MmlSFij8F0cw%3D%3D

author: Phil1977
author_rank: Frequent Contributor
timestamp: April 02, 2024, 01:13:41 pm
content: Wow, thanks for the 5A-type, I was not aware of this high-current-version.By chance I have a few of the standard 2A-versions of the same form factor laying around, so as soon as I receive my DP100 I´ll check out if there is some available space for this.And yeah, it definitely will be more of something improvised than some clean PCB construction. But at least in my habitat such devices often have the longest life

author: MegaVolt
author_rank: Frequent Contributor
timestamp: April 04, 2024, 12:34:35 pm
content: Perhaps it would be easier to switch the output with a solid-state opto-relay?

author: Phil1977
author_rank: Frequent Contributor
timestamp: April 04, 2024, 01:54:20 pm
content: Quote from: MegaVolt on April 04, 2024, 12:34:35 pmInside these relais there is either a TRIAC (high Uf and unsuitable for DC) or MOSFET (usually unipolar, usually with a minimum switch voltage or additional supply voltage)5A-versions are quite large and may require a heatsink.From my point of view you can either- directly use a high-side- FET with low RDSon, or- use a compact mechanical relais, or- use an additional isolated DC-DC module in the input.I have some positive experiences with the following (extremely cheap) boards:https://de.aliexpress.com/item/1005006462467909.html(not assosiciated anyhow with the seller...)

author: Phil1977
author_rank: Frequent Contributor
timestamp: April 15, 2024, 10:04:55 am
content: Just received my own unit: It´s a really nice toy and tool for mobile setups! Build quality and first impressions on DC-noise are absolutely positive.Regarding the Low-Side-Switch-problem: I´ve checked the available space and as already mentioned in this thread there would be some space for a miniature relais. I think the problem of disconnecting the output pole could also be solved by some kapton tape on the PCB, a nylon-screw for fixing of the +jack and soldering a wire directly to the gold plated backside of the jack.But:- The power supply uses this low side switch for quick load disconnection, but the buck converter is also disabled in the off-state. The only energy that could flow over a parasitic ground connection could be the charge of the caps and the noise mentioned in the beginning of the thread.- The current-sensing is also in the low side of the buck converter. This means, a parasitic ground connection heavily distorts current measurement and regulation. Neither the relais nor the high-side FET could improve that behaviour.Conclusively I will use this thing on a power bank or use an isolated DC-DC in its supply. Else it´s not well suited for any lab-setup with common-ground DC supply.Last but not least, this behaviour is even quite directly mentioned in the manual - but who the f... ever reads the manual of a power supply except in case of extreme procrastination

author: Dexter2
author_rank: Contributor
timestamp: April 25, 2024, 04:23:06 pm
content: I have received the DP100 PFET update PCB i designed a few days back and as promised below short update instructions and Gerber files if someone else wants to update this power supply.First the measurement. The output switches now ON-OFF in about the same time with no load attached now. There is no coupled noise on the output anymore. It now performs as it should...Upgrade procedure:Disassemble the unitRemove N-ch MOSFET, TVS, Fuse, LED, LED resistor and clean all pads from exes solder to get a nice flat surface, also clean the solder from TH capacitor pinsApply some capton tape the the back of the PCB (solder stop is not a guarantied insulator)Place the PCB to DP100 PCB and position with output terminal screws, and after that solder the PCB to the TH capacitor pinsOn the top part of PCB mount the TVS and a 100nF capacitorConnect the 5V and Enable wirePut everything back togetherI also tested the thermal performance with shorted output at 5A (worst case scenario for P-FET). And it works perfect and its also dead cool. You could use a 10 or even 20mohm lower performance part...I have 3 spare unpopulated PCBs so if someone needs i can send them out for free.

author: Phil1977
author_rank: Frequent Contributor
timestamp: April 26, 2024, 12:21:54 pm
content: Fantastic mod and great results!It´d be great if the manufacturer would have spent these additional cents.But anyhow, even with the mod the PS can't be flawlessly used in any common ground setup - now just due to the current sensing on the low side. It´s fantastic that you offer the mod boards, but I´ll stay with the additional galvanic isolator in the back of the bench.

author: zambetti
author_rank: Newbie
timestamp: April 30, 2024, 02:50:30 pm
content: This thread has been great reading.For anyone who has two DP100, do you know if it is possible/safe to chain them for positive and negative voltages?

author: zambetti
author_rank: Newbie
timestamp: April 30, 2024, 03:41:37 pm
content: Quote from: Dexter2 on April 25, 2024, 04:23:06 pmThis mod looks so clean. Beautiful work.I am considering giving it a shot.Reading your schematic, I have this list of components that must be bought...• M1 : Toshiba XPH4R714MC,L1XHQ• U1 : TI LM2776DBVT (SOT-23-6)• M2 : OnSemi 2N7002• C1, C2, C3, R2, R1Do you have a recommended part number for ZD1?

author: DaneLaw
author_rank: Frequent Contributor
timestamp: April 30, 2024, 07:47:10 pm
content: Quote from: zambetti on April 30, 2024, 02:50:30 pmDont know, but I would love to hear any feedback/progress on how tolerable a couple of DP100 are when chaining them up in different configurations (neg, volt, amp)Will also give it a shot again and report back.. tested it briefly when I got my two units, and encountered some issues to the point, that I backed out..

author: electr_peter
author_rank: Unknown
timestamp: April 30, 2024, 08:01:41 pm
content: DP100 manual states:QuoteSo series connection is possibly in theory (with independent floating supplies like battery banks). I do not have 2 units to test it in practice.

author: zambetti
author_rank: Newbie
timestamp: May 02, 2024, 08:40:43 am
content: Quote from: electr_peter on April 30, 2024, 08:01:41 pm

author: electr_peter
author_rank: Unknown
timestamp: May 02, 2024, 03:03:24 pm
content: Quote from: zambetti on May 02, 2024, 08:40:43 amDP100 are not isolated PSUs, these cannot be connected in series if powered from the same source.With different supplies it should work, regular considerations for series connection apply.

author: Phil1977
author_rank: Frequent Contributor
timestamp: May 14, 2024, 08:41:32 am
content: Quote from: electr_peter on May 02, 2024, 03:03:24 pmPlease also pay attention to the Current measurement on the "-"output of the DP100. If you connect more than one DP100 without galvanic isolation or if you even just use one DP100 e.g. on a 24V-powered DC system then you must not connect the circuitry on the DP100 anywhere with the rest of the system. Not even just by a data cable with ground connection or shielding! If you do anyhow you have no indication or regulation of the flowing current.I´d always recomment to either use- galvanically isolated lab PSUs, or- common ground lab PSUsThat´s both not possible with the DP100 without an additional isolating converter.

author: confusion
author_rank: Contributor
timestamp: June 01, 2024, 02:22:10 pm
content: Sorry to hijack the thread but I wanted power my DP100 unit using 28v from a powerbank. Ugreen PD 140WThe powerbank is listed as having PD3.1 (Do you need PD3.1 for 28v?)https://www.aliexpress.com/item/1005005654971205.html?spm=a2g0o.order_list.order_list_main.46.21ef18027neftPThe advertising material is contradictory. In the listing it says:USB-C1 output: 5V=3A 9V=3A12V=3A 15V=3A 20V=5A 28V=5AHowever in the pictures it says it only goes up to 20vI was intending to decoy the powerbank to deliver 28v by using another Alientek product I own, the UT70 usb tester.https://www.aliexpress.com/item/1005006116220488.html?spm=a2g0o.order_list.order_list_main.261.26d318027lkAB4So it's a bit confusing as to whether or not the powerbank can even deliver 28v and if I'll damage it in some way if I try.Any help would be much appreciated. Cheers.PS: The DP100 came with a female DC barrel jack to usb c cable. Am I correct in assuming the barrel jack is 5.5mm x 2.1mm ID? Or is it 5.5mm x 2.5 ID?I was wondering if I could use this decoy board in place of the UT70.https://www.aliexpress.com/item/1005005397916454.html?spm=a2g0o.productlist.main.9.61e37894qRCE67&algo_pvid=5ae51f20-0d9a-46ad-be54-fbf1ebbc8351&algo_exp_id=5ae51f20-0d9a-46ad-be54-fbf1ebbc8351-4&pdp_npi=4%40dis%21AUD%213.84%212.88%21%21%212.51%211.88%21%402101effb17172477897311871e7683%2112000032900047201%21sea%21AU%21724890917%21&curPageLogUid=f7SdzNhm8WHo&utparam-url=scene%3Asearch%7Cquery_from%3AI can't work out how to set the voltage on itand what is emark?

author: DaneLaw
author_rank: Frequent Contributor
timestamp: June 01, 2024, 08:00:56 pm
content: PD3.1 works fine with DP100 when used with a trigger..It has nothing to do with the DP100, as that unit cannot handshake for any higher than 20V/5A_100W (PD3.0) and below, including. Qualcomm's quick charge protocols.If you wanna use PD3.1 28V/5A_140W then you need a PD3.1 trigger and if your PD3.1 trigger ain't directly attached to the PD3.1 source (powerbank/PSU), you will also need a cable with a corresponding chip, that allows for PD3.1 voltage & current between the PD3.1 powersource and the trigger before PD3.1 units deliver/opens up for that higher voltage, so you don't risk dumping that power/voltage into a normal TypeC-cable that can't say no, and wont have the strains to carry that momentum.You can't damage the power bank, as either it got PD3.1 or it don't.. What you can damage are items AFTER the trigger, as they will be stop-fed the triggered voltage, and don't have any saying in the equation, that includes. cables, devices down the chain.. and it's 100% up the end-user that are using these crude PD triggers to make sure that anything after the trigger can handle that triggered voltage/current.So on the DP100' when you run it from a PD3.1 source - your not using PD handshakes at all.. DP100 will just see it as a crude 28v DC 2p power line.

author: confusion
author_rank: Contributor
timestamp: June 02, 2024, 02:45:35 am
content: Quote from: DaneLaw on June 01, 2024, 08:00:56 pmOK, understood.Quote from: DaneLaw on June 01, 2024, 08:00:56 pmI was always under the assumption that DC cables were, within reason, interchangeable insofar as the current doesn't exceed the maximum rating. A 20v5A cable running at 28v/5A would seem fine? Is this incorrect?Quote from: DaneLaw on June 01, 2024, 08:00:56 pmThat makes sense. The PD trigger is justrequesting28v.After posting last night I stumbled upon this unit which seems to be a cable with a trigger built into it, which seems neater, safer and quicker to use than the other unit I was suggesting earlier. There's even a comment down the bottom about someone using it on their DP100.https://www.aliexpress.com/item/1005006131442992.html?spm=a2g0o.cart.0.0.667b38dacIZyID&mp=1However, what you were suggesting earlier might mean that the DC barrel plug to USB-C adapter that came with the DP100 might not be appropriate for 28v and I can't seem to find a unit like this that is male C to male C. Which I don't really like the idea of anyway because I might accidentally use it on a device that doesn't appreciate it.Thanks heaps for the helpedit: I'm now thinking the DP100 will never ask for more than 100w (28v/3.57A) so as long as the barrel plug to USB-C adapter is good for 28v. I should be alright, right?

author: Purvirs
author_rank: Contributor
timestamp: June 02, 2024, 09:14:20 am
content: Quote from: DaneLaw on January 02, 2024, 01:49:04 amI've seen the reviews and the teardown of the DP100, P906 and Ruiden PSUs, if really need to choose a good PSU, would suggest P906, the reason is listed below:1. DP100 is a step-down only power supply, the max output voltage is limited to the input DC voltage, so if on site your DC source supply for DP100 is somehow below what you want, you wouldn't get the voltage stage you want; since it's a pure SMPS, to some noise sensitive application, you need to consider the output noise from DP100;2. Duiden is actually one of the power conversion 'panels' in the market, it's using a standard power brick inside, the panel utself is just a step-down SMPS, display and control, if you are looking for maximum wats per dollar, that will be the choice, and in the market, some other DIY type PSUs using retired Server Power Supplies, which are even cheaper, but same as the DP100, the switching noise cannot be ignored.3. MDP-P906, this one is different from the above, it has a 4-switch buck-booster inside, so you are not limited to the input volage, the fan is prepared for the full power 300W, in normal use you won't really hear the fan noise; the other different part is the output stage of P906, it has a program controlled low drop linear regulator, comparing with the above two, the output is much cleaner, also the building quality is much better than the above, CNC anodized case/shell, leaser engraved markings; that's why it's much expensive than the DP100 and Ruiden, another downside for MDP PSU is it's PC controllbility, it currently doesn't provide a PC or phone app for the control of the PSU, which is nor as good as the other two.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: June 02, 2024, 02:47:23 pm
content: Quote from: Purvirs on June 02, 2024, 09:14:20 amYou sound like you're literally trying to convince yourself.. alongside having very little insight into this specific item and you clearly haven't spent a moment just reading this thread, in regards to the product you are making conclusive comments on, with faulty conclusions left & right, even though you try to highlight the opposite in the first sentence.Im not interested in a boost-based SMPS flooded in caps with a noisy fan, that is massively overpriced and literally do pop-goes-the-weasel to release the infamous magic smoke when tested.= 10:18https://youtu.be/6yhlmqRFz4Y?si=rlq9ezRIfZHgW16_&t=562You can read the comments on the posted YT vid above' about all the users that got the same issues, but also other problems where they lose their accuracy and the voltage reading got a huge offset on numerous volts.Quote from: Purvirs on May 11, 2024, 02:17:53 amI don't know if you paid for all these items, or if you'r one of those hundred or thousands of people that Miniware is sending all their items free of charge in exchange for influencing on social media, but all that greasing ain't cheap for a company of that size, and needs to be picked up by some, if so it's quite an investment you have made, so I hope it worked out for you.Wouldnt be supprised that Punctual Atomic /AlienTek likely been inspired by Miniware's DP905 (buck) & their P906 (Buck/Boost) when making the DP100.Have over the years followed along on Tommy's stacking approach with his MDP-line from 2018/19 with a mix-match of various plugs over the years and the UI on the XP interface-console-module, could use some TLC.I purchased a few items from Miniware over the years. * Damaskus Scraber, * MHP30 (heating plate) * DS212 (2ch scope with a crude sig-gen) its a mixed bag, not least with the price in mind..- Sure the DS212 its well-built, extremely thin in an alucasing and looks great but it's a pain to use and was never updated, even though A lot of promises.. It seems all focus are on making new models and don't look back - with all efforts into design and very little into the UI, and the actual use-case.That's the case with many of Miniware products, its a Design studio and I reckon it shows, but if you are happy with all your MDP-items, then that is what matters, no reason that other items should make you less "so happy" about your own products.Sofar I been quite impressed with these DP100 and the ablelity to smack a cheap powerbank into it, also like that it comes with a nice casing to store it and the ablelity to control remotely and you have the standard wideness between the two 4mm terminals, so you can use 4mm-to-BNC adapters.

author: ElectricMarco
author_rank: Newbie
timestamp: June 03, 2024, 10:06:32 am
content: Hi everyone,just read the posts and I really want to buy a DP100.Does someone from the germany has a good aliexpress link?The official Alientek store is not shipping to germany and the other sellers have only a couple sold devices.Thanks for all information and for the good informations about the DP100.

author: Purvirs
author_rank: Contributor
timestamp: June 03, 2024, 10:46:41 am
content: Quote from: DaneLaw on June 02, 2024, 02:47:23 pmhaha, my bad that I didn't go through this thread thoroughly, I though it was purely discussing about this specific power supply unit, as mentioned in the thread, the voltage cut off when disable the supply, this issue seems presented on all of this kind of portable PSUs, including P906. The modifications discussed above to improve the output shutdown characteristics are indeed instructive.for me, personally, I need a PSU can do 24V (this is my main working voltage platform) output with a normal PD adapter, and take as less space as possible. last year when I tried to choose a portable PSU, I did evaluate DP100 and other PSUs, but due to the limitation mention above, DP100 is hard to accept.the performance comparision for this type of PSUs can be found here, it compared the Ruiden and MDP system, and the comments below that revealed the topology difference and why (Sorry it's in Chinese)https://www.bilibili.com/video/BV1EY4y1W7C1/?spm_id_from=333.337.search-card.all.click&vd_source=c47fe10e9121852849e685d12b947cbcthe link below is the teardown and analysis of DP100, for reference if someone need it:https://www.bilibili.com/video/BV1hZ4y1v768/?spm_id_from=333.337.search-card.all.click&vd_source=c47fe10e9121852849e685d12b947cbcthen I kept looking, finnally found the MDP system can suit my need, then I bought the whole kit, even though it costed me around 3.5k RMB, but luckly it solved my problem.I don't have hard feeling on Punctual Atom, as I used to buy a lot of MCU developing/evaluation boards from them, and they did help me a lot to understand how to do embedded coding. however things start to change a few years ago, Punctual Atom started to release a lot of dev tools which looks quite strange, like the USB-C soldering iron, iron station, logic analyser, USB meter... and the prototypes of these products can be easily found in the market, they seem to have lost their original intention, we understand that profitability is very important for a commercial company, but on Xianyu (a second-hand e-platform in China), Punctual Atom's product are on the top pages of these dev tools searching result, far more than the other competitors, seems so many people want to sell them due to some reasons... there are so many ads of Punctual Atom in the social media, they use very misleading slogans, so if you don’t look closely, you will think that their tools can do anything, such as this DP100....Sorry for going off topic. you are right Miniware did promise a lot, and rarely to deliver. the reason why I replied this thread was the first post caught me and I feel interested, Lol.... not trying to influence anyones purchasing decisions.It's a pleasure to discuss together, cheers

author: soopahfly
author_rank: Newbie
timestamp: July 12, 2024, 09:47:12 am
content: I'd love to give this mod a go, is there anywhere I can buy the bits from?Thanks!

author: ha_embedded
author_rank: Contributor
timestamp: July 17, 2024, 07:53:08 pm
content: Maybe someone can answer this: The DP100 can be supplied with up to 30V. But the PD trigger CH224K datasheet states 24V absolute maximum input voltage. Is the voltage seen by the CH224 limited somehow?2nd question: I do not have a DP100 right now, but if I buy one I would like to upgrade the DP trigger to 3.1. Is there enough space left for an extra 0.8mm PCB (about 6x6mm) with a PD3.1 trigger. It cannot be mounted within the space of the ESSOP10 package for sure - but maybe somehow above the desoldered CH224 with wires?Think about the HUSB238 from Hynetek, available at LCSC:https://www.hynetek.com/uploadfiles/site/219/news/24322c00-2276-4d74-98db-c74432318210.pdf#page30Or a ready made PD Trigger from Aliexpress.BTW: I know there are many ready made external trigger cables available.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: July 18, 2024, 12:40:41 am
content: Quote from: ha_embedded on July 17, 2024, 07:53:08 pmYou are not using the PD trigger for voltages above 20v (PD3.0/5A)It will accept both these modern chargeprotocols, like PD (PD3.0 and below) & QC Quickcharge but also just crude DC input.When I use it for fx 24v, and to run these double digits optical-wattage lazing rigs below, that needs 24v, I trigger PD3.1 from my power-bank (28v/5a) that I trigger outside, and then I dial it down with the DP100 to 24v.DP100 takes the 28v as a crude DC-input.

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 18, 2024, 07:11:55 am
content: Quote from: DaneLaw on July 18, 2024, 12:40:41 amI assume he is concerned about if the CH224 sees the bus voltage even if it was not triggered by itself. If no one knows it I can measure it soon.

author: ha_embedded
author_rank: Contributor
timestamp: July 18, 2024, 04:35:11 pm
content: Quote from: Phil1977 on July 18, 2024, 07:11:55 amExactly. As far as I know the external „up to 30V“ is also plugged into the USB-C via adapter cable - correct? So if the CH224 is in parallel to the USB-C port it will be driven out of spec.

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 18, 2024, 05:01:30 pm
content: Maybe the VBUS is not directly routed from the plug to the chip - I do not know if the chip needs it to do the negotiation or if its just connected to CC1 and just does the "paperwork". I´ll have a look this weekend.

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 18, 2024, 07:55:16 pm
content: Good news: While the DP100 is powered by non-managed 30V DC, the maximum voltage on the CH224K VBUS pin is 10V, VDD is around 2V. It seems that the device only powers this chip if it initializes the power delivery.

author: icpart
author_rank: Regular Contributor
timestamp: July 28, 2024, 02:41:17 pm
content: I just make fast search about good load switch ITS428L2. Seems that be good candiate for that job. It is have all protections inside is, maybe t will not need PCB if can handle load current.https://eu.mouser.com/ProductDetail/Infineon-Technologies/ITS428L2?qs=sGAEpiMZZMvjbjwkTuU2aZXYNMpOS50Yh7EhO2KKWBw%3DAs I tried figured out that if my DP100 have that undershoot issue time ago I tested it with USB-C charger and my portable OWON hds2202s and there didn't have such problem as I remmeber, but maybe need to test it again.

author: caind
author_rank: Newbie
timestamp: July 29, 2024, 12:38:03 pm
content: The ITS428L2 needs at least 4.75 V. You certainly don't want to use the DP100 for output voltages ≥ 4.75 V only...

author: Evi
author_rank: Regular Contributor
timestamp: August 28, 2024, 09:54:27 am
content: Just received one.I could not reproduce Power OFF anomaly at all in all combinations.

author: Evi
author_rank: Regular Contributor
timestamp: August 28, 2024, 11:20:00 am
content: Sorry, it's even worse.

author: Evi
author_rank: Regular Contributor
timestamp: August 28, 2024, 12:03:51 pm
content: For me solution is: just short out power MOSFET M1.Thanks to old Occam.

author: kasoah
author_rank: Newbie
timestamp: September 23, 2024, 07:30:16 pm
content: I am powering my DP100 with a USB C PD, 19V.Current measurements seem reasonable.However, when I plug the USB A connection in, the power reported drops quite noticeably.From around 26W reported to 24W.Anyone else notice this?EDIT: Grabbing a USB isolator fixed this. I used one I had on hand: KGUSS Topping HS02 USB2.0 but I'm sure cheaper ones work.

author: Phil1977
author_rank: Frequent Contributor
timestamp: September 24, 2024, 02:05:04 pm
content: That´s exactly the problem of the non-isolated output with low-side current measurement.As soon as you plug in the USB-A connection you create a ground-loop from the DP100 main output to the USB-A output. And all current that flows back by the USB-A cable is not accounted for in the power display.Using a galvanic isolator is exactly the good solution for this problem. It´d be even better if the DP100 would be galvanically isolated by itself or would have a real common ground for its inputs and outputs.

author: codingjoe
author_rank: Newbie
timestamp: September 29, 2024, 08:58:00 pm
content: Hi there,I took Scott's idea to use WebHID and started building a proper browser-based interface.It's still a work in progress, I only managed to plot a power chart. However, that already pretty helpful, since this is missing hardware wise.I'll try using the next weekend to add proper control to adjust all settings via the browser.You check it out already, it's open source:https://github.com/codingjoe/DP100-WebAppI hope you like it!Cheers!Joe

author: codingjoe
author_rank: Newbie
timestamp: October 03, 2024, 05:54:46 pm
content: OK, I spent another day working on a web interface. This is what I came up with. You can set U and I value now. And monitor the device including OPP events.

author: codingjoe
author_rank: Newbie
timestamp: November 04, 2024, 08:54:27 am
content: I took the time to make a quick demo video of the web interface for the DP100, hope it helps:

author: cdxa
author_rank: Newbie
timestamp: June 19, 2025, 12:10:48 pm
content: Do you happen to know what could be used as a replacement for the encoder in this power supply? Preferably something reliable like an Alps? After just a dozen or so uses, my encoder is already barely working.

author: tunk
author_rank: Super Contributor
timestamp: June 19, 2025, 01:20:22 pm
content: Looks similar to the ones used for mouse scrolling wheels.You could also try some contact cleaner.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: June 19, 2025, 09:12:55 pm
content: Looks like a common off-the-shelf wheel encoder.https://youtu.be/Pd6LG7iP2GQ?si=pXJggXptejvK5_X7&t=848Though as stated above, contact cleaner can at times do wonders.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: June 19, 2025, 09:32:59 pm
content: Quite a few of these small PSUs are popping up left & right.Saw this one with a touch interface a few days ago.https://tinyurl.com/3uezdx4f(gotta love that dude sampling in at 25sec "da-da")

author: geonicz
author_rank: Contributor
timestamp: August 19, 2025, 05:43:54 am
content: Are there any pcb revisions of this psu? Mine two don't have output shutdown noise