Chinese converter test for PowerBank. Step-Up 5V "1500mA"

This time it was one of the drivers that Kamil gave me for testing.
It is a tiny module designed for PowerBanks.



Interestingly, the invoice shows as:

"STEP-UP PowerBank 2V-5V to 5V 1500mA converter".



So far, I have bought these boards as DC-DC converters, 2.5V - 5V, for 5V, 1000mA. Well, we'll see. Unfortunately, when I connected the converter for tests, my tiny oscilloscope got tangled in the spider's web of wires and fell to the floor.
I think something broke inside, because now it displays something like this all the time:


Chinese February will probably need to be improved.
Well, never mind the oscilloscope, after a while I find that I received a terrible crap specimen, because the previous ones, which I did not test, but used to a greater or lesser degree, did not make any (at least audible to me) sounds.
The tested converter maintains the correct voltage under load, which is confirmed by the photos. But after a few minutes it gets very hot.

With a load of 0.5A after approx. 3 minutes of operation:


With a load of 1A after approx. 3 minutes of operation:


During the tests, I did not dare to "reach" the "promised in writing" 1500mA, because while the voltage was stable, the converter literally sang in a large input voltage range. The sound effects occurred at both 500mA and 1000mA loads.

Now a few photos, so that it would not be that I made it all up and finally two videos presenting the "singing" of this converter.







Because the converter heats up very much, which in the case of these particular converters (and as I mentioned, I have already used the exact same model several times already) is quite normal, but I have never encountered a chance that it warms up so quickly. Additionally, it makes suspicious sounds. I wonder if I should send it to the land of eternal power supplies and transformers using the "let's see how much we can squeeze out before the magic smoke disappears from the chip" method. :)

Do you want such a trial?

And now the promised movies. In the background you can hear the fans from the power supply and the artificial load, but I'm sure you will easily recognize the "twitter" of the converter, especially since you can hear that the modulation changes in relation to the voltage change.

Here the inverter is loaded with 0.5A and starts its correct operation from 2V.


Here we take 1A and the converter starts working correctly only at 2.8V


You can't hear it that clearly in the movie, but believe me, this sound is very unpleasant and really loud.

Now imagine a PowerBank next to your head, in a tent, in the beautiful wilderness of the Bieszczady Mountains, for example ... And this cruel whistle of the converter.

EDIT:

Unfortunately, after about an hour under a load of 1000mA, the converter turned off. I wasn't in the room, so I don't know what temperature it got. When I got back it was 61 ° C and it started.

EDIT 2:

And it happened. This time I was fortunately next door when I noticed the characteristic smell of magic smoke. I even managed to take a few photos, but unfortunately you can see anything at all on only one. But I managed to capture the soul of this converter. Hehehe ...



It had to "jerk" a lot of electricity, because the voltage on the power supply dropped by 0.5V.