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Set - DC / DC converter 9A XL4016 and panel meter DSN-VC288, assembly, test

TechEkspert 83412 166
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  • #151 19694928
    ArturAVS
    Moderator  
    I would suggest modernizing the composition of the set. Eg converter; https://www.elektroda.pl/rtvforum/topic3834976.html and the meter https://allegro.pl/oferta/modul-woltomierz-0-...ocznik-10632858607?reco_id=18db1ce6-3fc6-11ec -8b8b-bc97e12c68a096499e13bc806f55bd0c404f69ac7020 I have this 50A version meter not unpacked yet. There would be a stronger version of the set.
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  • #152 19709271
    1Waldemar
    Level 12  
    Hello, everyone interested in this converter. I have a question for users - I want to build a power supply with two independent systems (sometimes you need a dozen volts at once and a few to power the systems next to it, i.e. two different voltages. I have a 24V 2.5A power supply and the question is whether anyone tried to connect the masses of two independent such same converters from the same power source?
    A bit confusing? - easier. One 24 / 2.5 power supply, two converters set to 5V and the other to 12V - can their masses be shortened?
  • #153 19710927
    TechEkspert
    Editor  
    Looking at the PCB pattern https://www.elektroda.pl/rtvforum/topic3434421.html it looks like the output GND is not directly connected to the input GND (unless there are vias). If there is no continuity between the input and output GND (e.g. there is some measuring resistor) then the output GND of the two inverters cannot be connected to the input GND connected.
  • #154 19712105
    1Waldemar
    Level 12  
    Yes, unfortunately there is a measuring resistor for the current in series on the neutral circuit. Somewhere I read that we can, however, lose the current measurement. When building, for example, on LMs, this will not be a problem, but we have no current limitation and protection.

    When building on a converter and a transformerless power supply such as laptops, what else would you recommend? what else to add?
    There are those who recommend large capacitors between these modules (1000 micro up), there are those who suggest disconnecting the inverter from the laptop power supply through an additional switch on the panel so that the inverter does not go stupid if it was under load when the system was turned off.
    What do you propose makes sense, what are your practical experiences with such systems?
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  • #155 19712119
    Anonymous
    Level 1  
  • #156 19712290
    lukiiiii
    Level 29  
    And the rectifier diodes on the (-) return of both converters?
  • #157 19719673
    Walery K
    Level 23  
    I plan to do something similar, but I will power each inverter from a separate power supply. Then it should work without any problem. Of course, the masses are connected at the output of the converters.
  • #158 19865153
    rvh4421
    Level 2  
    Hello all,
    I'm from Belgium and new to this forum.
    Since I'm practising with xl4015 and xl4016 modules last weeks, I found here useful information!
    When using the modules for charging Lithium batteries , the charging works ok but there always remains a 10% charging current at the end witch is not good for Lithium charging, so the process can not be left unattended.
    I found a way to solve this: once the charging led goes on, this is notified (flipflop) and when the "full" blue led signals the completion, the 4015 or 4016 chip is shut down (idle mode - no more output). A blocking diode at the output is needed to prevent reverse current from the battery.
    Only 2 transistors (flipflop) and a 2n7000 mosfet (to block the IC) are needed with a minor modification on the circuit board.
    Is somebody interested for further discussion?
    grts
    rik
    rvh44(_at_)telenet.be
    Attachments:
    • Set - DC / DC converter 9A XL4016 and panel meter DSN-VC288, assembly, test ScreenShot1906.jpg (236.38 KB) You must be logged in to download this attachment.
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  • #159 19868471
    TechEkspert
    Editor  
    Interesting, the use of the LED signal to complete the charging. Maybe an input relay could be used. You can then add a momentary button "start charging", which will start the relay and the signal from the LED will maintain the operation of the relay. When the LED goes out, the relay will disconnect the power to the entire system.
  • #160 19873974
    rvh4421
    Level 2  
    Hello TechEkspert,
    Thanks for repluing! I would prefer a sollution without relay if possible. Using the green led for finish signal is a bit tricky: it lights too at startup (to set V or C without load) or with a full battery (load current too small). A secure protocol seems to be: wait for charging (red led goes on) and then wait for the green led to stop everything. I know this could be done with a microcontroller, but I hoped for a solution with minimal hardware, eg a start button (when loading has begun) automatically finished by the green led. Any idea? grts Rik
  • #161 19876831
    TechEkspert
    Editor  
    A MOSFET transistor can be used instead of a relay.
    The start button can polarize the MOSFET gate, after releasing the button, the transistor gate can be polarized from the powered circuit, the signal from the green diode turns off the power to the system by turning off the MOSFET transistor.
  • #162 20551566
    Olkus
    Level 32  
    It's been a while... Is there a chance that converters will appear?

    Regards,
    AND.
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  • #163 20551569
    E8600
    Level 41  
    As far as I remember, she was only in the shop once? And I'm sure they'd find them quickly. :D
  • #164 20551756
    Olkus
    Level 32  
    Unfortunately, only once. I'd love to take it myself ;)

    Regards,
    AND.
  • #165 21263564
    dukealex
    Level 1  
    Close-up of a damaged electronic circuit with a visible transistor and coils.

    hi. i lost too much time whi this circuit. mount a fake xl4016. fast burn the internal mosfet. bat products.lost money. bye

    Added after 2 [minutes]:

    dukealex wrote:
    Close-up of a damaged electronic circuit with a visible transistor and coils.

    hi. i lost too much time whi this circuit. mount a fake xl4016. fast burn the internal mosfet. bat products.lost money. bye


    nb:
    Is the microscopic chip on the transistor visible? it's too small to dissipate 300 watts 8 amps!! ridiculous.

    Added after 5 [minutes]:

    dukealex wrote:
    Close-up of a damaged electronic circuit with a visible transistor and coils.

    hi. i lost too much time whi this circuit. mount a fake xl4016. fast burn the internal mosfet. bat products.lost money. bye

    Added after 2 [minutes]:

    dukealex wrote:
    Close-up of a damaged electronic circuit with a visible transistor and coils.

    hi. i lost too much time whi this circuit. mount a fake xl4016. fast burn the internal mosfet. bat products.lost money. bye


    nb:
    Is the microscopic chip on the transistor visible? it's too small to dissipate 300 watts 8 amps!! ridiculous.
    Microscopic chip on a transistor mounted on a board.
  • #166 21264386
    TechEkspert
    Editor  
    Echoing the fakes... You can damage other equipment because of them.
  • #167 21337289
    endrju3011
    Level 1  
    >>21264386 Whether such a thing:
    Link .
    secure the circuit in question?
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Topic summary

✨ The discussion centers on assembling and testing a regulated DC power supply kit based on the XL4016 DC/DC buck converter module capable of 9A output and adjustable voltage from 1.2V to 35V, paired with the DSN-VC288 panel meter for voltage and current readout. Users share experiences with powering the converter from various sources including laptop power supplies, switching power supplies (e.g., 24V/6A or 24V/9A AC/DC modules), and transformers with rectifiers and capacitors. Key topics include protection against reverse polarity connection, with suggestions such as parallel Schottky diodes (e.g., SBL2040CT) or series diodes and MOSFETs to prevent damage. The use of coarse and fine potentiometers (typically 10k and 1k linear types) for voltage and current adjustment is debated, with recommendations to avoid multiturn potentiometers due to inconvenience and nonlinearity. Calibration methods for current limiting using the DSN-VC288 meter are described, emphasizing the need to scale potentiometer settings with a load or short circuit to mark current limits. Issues with the converter include potential damage at input voltages above 30V, lack of reverse polarity protection, and sensitivity to poor-quality potentiometers causing unstable regulation. Capacitor placement and values (e.g., 1000µF/63V) at input and output are advised to reduce resonance and voltage spikes, especially when used in automotive environments. The DSN-VC288 meter operates independently and requires proper wiring: voltmeter in parallel and ammeter in series with the load, with thick wires for current measurement. The converter is suitable for applications such as battery charging (lead-acid and lithium), microcontroller power supplies, and general lab use, but care must be taken with input power quality, protection, and proper calibration. Attempts to increase output current beyond 9A are generally discouraged due to thermal and component limitations. The discussion also covers practical wiring tips, troubleshooting, and component substitutions to improve reliability and usability of the power supply kit.
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FAQ

TL;DR: XL4016 buck board delivers 1.2-35 V at up to 9 A (≈300 W) [Elektroda, TechEkspert, post #17184389]; reverse hookup “will probably blow out the capacitors” [Elektroda, maciek_90, post #17185062] “Such a simple protection will take over all the current” [Elektroda, mariomario, post #17185106] Why it matters: two solder-level fixes turn a €4 module into a safe bench PSU.

Quick Facts

• Input range: 8-40 V DC; output: 1.2-35 V, 0-9 A, ≈300 W [Elektroda, TechEkspert, post #17184389] • Efficiency: Typical 95 % at 24 V→12 V/5 A (XLSEMI datasheet) • Panel meter DSN-VC288 max supply 24 V (20 mA draw) [Elektroda, TechEkspert, post #17184389] • Safe meter power above 24 V: add 12 V regulator or isolated DC/DC [Elektroda, TechEkspert, post #17184389] • Board cost: US $3-5 on AliExpress (2025 listing)

What are the core limits of the XL4016 buck converter?

The board accepts 8-40 V input and produces 1.2-35 V at up to 9 A continuous (≈300 W) when cooled properly [Elektroda, TechEkspert, post #17184389] Efficiency peaks around 95 % at a 2:1 step-down ratio (XLSEMI datasheet).

How do I power the DSN-VC288 meter without destroying it?

Keep the supply to pin 5 below 24 V (some vendors quote 30 V, play safe). When the converter input exceeds 24 V, feed the meter through a 12 V linear regulator or an isolated DC-DC module; leave pin 4 floating if a separate supply is used [Elektroda, TechEkspert, post #17184389]

What is the simplest reverse-polarity protection that won’t waste volts?

Parallel-wired Schottky diodes (e.g., 3× SBL2040CT) on the output act as a low-loss ‘crowbar’. They conduct if the battery is reversed and spare the board up to ≈120 A surge [Elektroda, mariomario, post #17185106] For minimal drop, replace them with a ‘perfect-diode’ MOSFET OR-ing circuit [Elektroda, krzysiek_krm, post #17185394]

Can the module safely charge a 55 Ah lead-acid battery?

Yes. Set CV to 14.4 V (temperature-correct as needed) and CC to ≈5.5 A (0.1 C). The CC/CV behaviour matches common charger profiles [Elektroda, Anonymous, post #17556846] Add a 15 A fuse and a reverse-blocking diode or MOSFET for extra safety.

Why does my current-limit knob do nothing?

A broken 3296-style trimmer or an open shunt disables the limiter, leaving the converter at full current [Elektroda, sylweksylwina, post #17591899] Check that the potentiometer changes resistance smoothly and that the 0.01 Ω shunt hasn’t lifted; replace faulty parts to restore CC mode.

How do I add coarse and fine voltage/current control?

Wire a 10 kΩ ‘coarse’ pot in series with a 1 kΩ ‘fine’ pot (pins 1-2-3 on both). Turn fine fully CCW, set rough value with coarse, then tweak with fine for ±0.05 V accuracy [Elektroda, CMS, post #17185972]

Is a laptop adaptor a good 24 V source for this board?

Yes. Users report stable operation at 24 V/4-6 A with only a 1 000 µF electrolytic added at the converter input to tame start-up surges [Elektroda, Dżyszla, post #17469260] Efficiency stays above 90 % and noise is negligible on MCU loads.

Can I run two XL4016 boards from one supply and tie their grounds?

Only join the grounds after each board’s output shunt. Tying input grounds defeats the individual CC loops; tying output grounds keeps both limiters functional [Elektroda, Anonymous, post #19712119]

What happens if the panel-meter shunt and converter shunt stay in circuit?

You read current twice and drop extra millivolts. Desolder the converter’s 0.01 Ω shunt and wire the board to the meter’s 0.005 Ω shunt for a single, accurate reading [Elektroda, Anonymous, post #17191846]

Car install: why did my board die when I started the engine?

Starter transients can spike above 60 V. Add a 100 µH choke and ≥220 µF low-ESR capacitor on Vin, plus TVS diode (40 V standoff) to clamp surges [Elektroda, adamas_nt, #17476225; lukiiiii, #17567447].

Are counterfeit XL4016 ICs common?

Yes. Users opened failed boards and found die sizes too small for 300 W; devices died at 8 A [Elektroda, dukealex, post #21263564] Buy from known suppliers or test at half-rated load first.

3-step: How do I calibrate the DSN-VC288?

  1. Feed exactly 10.00 V from a reference source to pin 3.
  2. Adjust volt-trimmer until display reads 10.00 V.
  3. Pass 5.000 A through the shunt; tweak current-trimmer until the display matches. [Elektroda, TechEkspert, post #17184389]
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