Compact Hi-Link HLK-PM12 Power Supply

For some reason, reviews of such power suppliesit’s small, and it’s understandable in its own way, buyers are often interested in powerful models, and not a trifle with a power of only 3 watts. But for various low-power devices sometimes just compact models are required, especially if they have high reliability. And today I have a story about such a Hi-Link power supply.

The power supply was ordered “in the appendage” to reduce the total cost of delivery since delivery from this seller costs 75 cents, but when ordering several products it is divided between them.
There are three models on the page:
HLK-PM01 - 5 Volt 0.6 Amps
HLK-PM03 - 3.3 Volts 0.9 Amps
HLK-PM12 - 12 Volts 0.25 Amps.
If you look at the ratio of voltage to current, it becomes clear that the power is 3 watts. In general, there are similar modules for other capacities as well as for other manufacturers.
For example, the HLK-5Mxx series for a power of 5 watts, seriesIRM-02-xx, IRM-03-xx, IRM-05-xx, PM-05-xx, IRM-10-xx, PM-10-xx, IRM-15-x, PM-15-xx, IRM- 20-xx, IRM-30-xx with a power of 2, 3, 4, 10, 15, 20 and 30 watts from Minwell. There are even "monsters" IRM-45-xx and IRM-60-xx with the power of as much as 45 and 60 watts.
And this is not to mention a bunch of companies that produce them - Recom, Power Mate, Power-One, Motien, PEAK, Chinfa, Mean Well, Texas Instruments, Rohm. A variety of cases and capacities, from 0.25 watts and above.

But modules from Hi-Link have their own advantage. quite favorable power / price / quality ratio, because they are also used quite often.
I ordered a module with a voltage of 12 Volts because I use this voltage more often, and not 3.3 or 5, but in general I want to order different models, just to be in reserve.
The sizes are relatively small, there are models both smaller and larger.

The exact dimensions can be seen on the drawing of the power supplies from this series.

Brief technical specifications are indicated directly.on the case. I wanted to find the complete ones for 12 Volt converters, but for some reason the data is only for the 5 Volt version for some reason, so I did not copy them here.
Below four outputs for soldering, I am a littleit was confusing that the distance between the input terminals is noticeably smaller than between the output, although it would be more logical to do the opposite. The case is sealed, a solid compound filling is visible from below.

I won’t go around in circles, especially since there’s nothing special to describe and I’ll move on to the tests.
For tests were used:
1. Electronic load
2. Oscilloscope
3. Multimeter
4. The thermal imager.
An RF filter consisting of an electrolytic capacitor of 1 μF and a ceramic 0.1 μF was installed in front of the oscilloscope probe.

The power supply showed a very good load capacity and stability of the output voltage.
The voltage began to drop only at a double output current, and at a current of 650 mA it fell below my pre-set limit of 9 volts.

The range of ripple was also not very large, up to a load current of 300 mA, it was about 30 mV rr.

Almost to a twofold current, the range was about 50 mV and began to grow sharply starting from a load current of 500 mA.

The voltage keeps stable, it can be seen on the schedule.

In addition, I conducted a load test with current up to1200 mA, the power supply has survived and this mode has reduced the output voltage to 3.77 Volts, although I expected it to turn off. However, he also has protection against short circuit.

And of course, a small thermal run, but in addition to estimating the temperature, I measured the dependence of the output voltage on heating.
These power supplies have a small negative relationship, i.e. as it warms up, the output voltage decreases slightly.
The photo below shows:
1. Voltage at a current of 250 mA at the beginning of the test.
2. Voltage after 20 minutes
3. After 20 minutes of the test, I raised the load current to 400 mA and drove like that for another 20 minutes, in the photo voltage after 20 + 20 minutes.
4. After 40 minutes of the test, 20 minutes (250 mA) + 20 minutes (400 mA) I took off the load, the output voltage rose, but was lower than the initial 12.031 on a cold PSU.

The power supply behaved perfectly even with current400 mA load and the case warmed up to only 55 degrees. I think that this margin is more important for working with a low input voltage, and with our 220-230 volts the load current can be raised above the standard 250 mA.

On the Internet was found very detailed review 5 Volt version of this PSU, which has a slightly lower efficiency due to lower output voltage and more current (600 mA). Thermograms were also found there at a load current of 600 mA and 1000 mA.

In addition, there was shown the disassembly of this PSU (5 Volt version), I didn’t break my own because I have it in only one copy and I still plan to use it

Everything is pretty good inside, for obvious reasons.there is no input noise filter, it just did not fit in, but otherwise everything is fine. I was pleased with the large distance between the primary and secondary parts, the protective slot under the optocoupler, and indeed the overall quality.

A 4.7 microfarad capacitor is installed at the input, for the declared 3 watts it is quite normal, at the output there is a choke that reduces the ripple of the output voltage, everything is like in "adult" PSUs, only a small one.

And here I just want to quote the famous - Baby son came to his father к
Launching you is not confused by the presence of terminal blocks in a large PSU, in fact, they both belong to a series of PSUs mounted on a printed circuit board, there is just a photo version with terminals, but there are also soldered outputs.
In the photo, IRM-60-24ST with a capacity of 20 times more than the observed baby.

As a result, I’ll say that I liked the PSU, I think if there is a need for something like that, then it's definitely worth taking.
That's all for me, I hope that the review was useful, as I usually wait for a question in the comments, along the way, maybe someone will throw a link to more advantageous options.