FAQ
TL;DR: Bench tests show up to 1.5 Vpp ripple at 5 V/1 A (30 %)—“a massacre” [Elektroda, czareqpl, post #17122326] A simple 470 µF output cap cuts noise dramatically [Elektroda, mkpl, post #17125841] Module uses the MP2307 ‘mini-360’ buck core rated 23 V / 3 A [Elektroda, mkpl, post #17125841]
Why it matters: Knowing limits and fixes lets makers avoid burnt loads and noisy measurements.
Quick Facts
• Input range: 6 – 23 V (20 V recommended) [Elektroda, TechEkspert, post #17120828]
• Adjustable output: 0 – 16.3 V, 2 A continuous, 3 A short-term [Elektroda, TechEkspert, post #17120828]
• Measured ripple: 150 mVpp no-load, 1.5 Vpp at 1 A [Elektroda, czareqpl, post #17122326]
• Price tag in PL: ~36 PLN incl. plexi case [Elektroda, fred114, post #17121821]
• Controller IC: MP2307 320 kHz synchronous buck (‘mini360’) [Elektroda, mkpl, post #17125841]
Where can I buy the LCD 2 A buck module?
Sellers list the board as “LCD DC/DC buck 2A plexi case”. Search on AliExpress or eBay or use the Gotronik offer at about 36 PLN [Elektroda, fred114, #17121821; Elektroda, hehehehuhuhu, #17121843].
Which chip drives the converter?
The power stage is the MP2307 synchronous buck IC, commonly sold as the “mini-360” module, rated 23 V in, 3 A peak, 320 kHz switching
[Elektroda, mkpl, post #17125841]
Why does the display show a battery icon?
How bad is the output ripple?
Can I reduce that ripple?
Yes. Replacing the tiny MLCCs with one 470 µF low-ESR cap (e.g., Panasonic NXH) cuts ripple sharply. Larger caps may help further, limited by ripple current rating
[Elektroda, mkpl, post #17125841]
Quick 3-step fix for cleaner output?
- Desolder the two 22 µF 1206 MLCCs at Vout.
- Solder a 470 µF/16 V low-ESR electrolytic directly across Vout and GND.
- Retest ripple; expect >5× reduction [Elektroda, mkpl, post #17125841]
Is there any current limiting?
Why do users complain about the screw terminals?
Factory terminals have high contact resistance and weak solder joints. Wires detach after a few insertions; many users bypass them and solder leads directly
[Elektroda, Urgon, post #17123318]
What happens if input power vanishes while Vout is set high?
Safe to hang a large capacitor or battery on the output?
A large 4,700 µF cap or battery will back-drive the buck through the MP2307’s body diode. Add a series Schottky or MOSFET ideal-diode to block reverse current [Elektroda, wieswas, #17168746; MP2307 datasheet].
What input voltage should I really use?
Keep Vin ≤ 20 V. The MP2307’s absolute max is 23 V, but users report failures near that limit [Elektroda, TechEkspert, #17120828; Elektroda, mkpl, #17125841].
Can I recalibrate the voltage display?
Edge-case: will it power a Raspberry Pi reliably?
Any better alternatives?
Comments
The price and link to the website I would like to ask: p What systems is the device assembled on? Do you have a diagram? [Read more]
And what is this battery indicator for? [Read more]
Please send me the link because I want to buy one myself [Read more]
More than 1Vpp of ripple at 5V is a massacre [Read more]
I would like a link to buy, too :?: [Read more]
Gotronik sells this wonder for PLN 36. [Read more]
Just enter "LCD DC / DC buck 2A plexi case" on ebay.com [Read more]
AVE ... I have this module but I don't use it anymore. Lack of current limitation disqualifies it in workshop applications. In addition, the factory power connectors suck, I advise you to desolder... [Read more]
I join the question. Somebody knows? [Read more]
In my opinion, after watching the oscillograms, this converter is not of good quality. With no load, ripple pk-pk 150mV and such pins, the converter probably shines well. I wonder if it meets EMC standards. ... [Read more]
Good for nothing, somewhere I saw a description of "that for future solutions" in advance :D [Read more]
Defeat. [Read more]
A few weeks ago, there was also an inverter in GADGETS, but in my opinion it was much better, because it had an output voltage range of 0-30V, and output current adjustment. The only downside was the lack... [Read more]
@ szymon122 there is no diagram, the modules are e.g. here: https://pl.aliexpress.com/item/Diy-kit-DC-DC-adjustable-step-down-Regulated-power-supply-module-Belt-voltmeter-ammeter-Dual-Display/32805760120.html ... [Read more]
AVE ... The connectors are of extremely crap quality, February also did not hurt the ass. After the fourth time the wire fell out, I desoldered these connectors and fired. Now I do not use this power... [Read more]
Maybe some sensible capacitor at the output would help? Just by the eye, after the photos (for spite all from the same angle ;) ), there is nothing specific there except a tiny MLCC. Maybe someone took... [Read more]
With such ripples, I do not know what can be powered with it. Probably some kind of heater :P [Read more]
Right out of the box, it's actually a drama. Maybe a matter of looking at what the executive system is and calculating the components. Maybe someone was counting on the knee parameters for a specific... [Read more]
Or a light bulb. I powered a raspberry pi of a similar construction with a converter (only without LCD, also ali). I was surprised, despite the 5A's performance, Rpi was able to freeze or project... [Read more]