SUNKEE LM2577 DC-DC Adjustable Step-up Power Converter Module
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- Input voltage :3-34V
- Output voltage: continuously adjustable (4-35V)
- Output Current: 2.5A (MAX)
- Module size: 49 (mm) x26 (mm)
- Input mode: IN + input positive level, IN-input negative
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Module Properties: non-isolated step-up module Input voltage :3-34V Output voltage: continuously adjustable (4-35V) Output Current: 2.5A (MAX) Input Current: 3A (MAX) Module size: 49 (mm) x26 (mm) Input mode: IN + input positive level, IN-input negative The output manner: OUT + output positive level, OUT-output negative Adjustment method: first the right then the input power (3-34V, multimeter between) and then monitor the output voltage and adjust the potentiometer (clockwise turn buck counterclockwise turn boost) For the 12V output voltage :4-35V continuously adjustable (building no-load debugging) Our default shipping voltage other voltage can regulate their own
Top customer reviews
At 12 volt in 24 out 15 watts this thing got too hot to touch . after reading the data sheets I changed the .100mH coil to a torroid I scrapped from an old computer power supply wound down to the correct value and added a copper heat sink to the chip
Now I get the full rated output with no heat issues
As for the 3others they had shorted diodes replaced these with some 5 amp ones and these now work great
They get 3 stars as the circuit boards for 4 of these cost $25 to have printed so they are cheap and I expected issues
If you are not handy with a soldering iron and have a LCR meter then go with a heaver duty one or keep your current below 1 amp
Overall happy with this purchase and would buy them again
I need 12-13Vdc to be stepped up to 24Vdc to run a garage door opener receiver card. Not only does this card do that job, but it does it better than I expected -- after setting it to 24Vdc output via the trimpot, I varied the input voltage from 18 to 12 VDC and found no significant change in the output voltage. So not only am I getting voltage boosting, I am also getting regulation.
The device also has a very loud whine when powered on, with a frequency approximately proportional to the output voltage, and the adjustment potentiometer has no physical limits, as I discovered immediately when trying to set the output voltage to a safe minimum. After 35 full revolutions with no end in sight, I finally braced myself and powered the device on, only to learn that it had actually reached minimum voltage 30 turns ago, but the potentiometer used has no way of physically indicating so.
Spend a little more(or in some cases, less) and buy something that can actually be adjusted and calibrated without requiring the nerves of a bomb defusal technician.
I set the first one aside and hooked up the second one. This time I turned the pot excruciatingly slow, about 1 turn every 4 or 5 seconds. When I got around 18 turns I slowed down even further. Same thing, around 20 turns, output jumps to 60v then plummets, insane amp draw, smoke from the LM2577. I dissected both boards and found the SS34 Schottky diodes shorted on both boards; caps were still good.
I replaced the diodes and powered the boards up and tried again. This time, instead of jumping to 60v and drawing 4A, they dropped straight to 4V and drew 4A. One of the LM2577s blew up.
I am royally peed off. These things (at least the ones I was sent) are absolutely defective and a waste of time and money.
Either the QA/QC is carried out by drunk apes so some people get good boards and some don't, or someone is coming on here and giving a bunch of B.S. positive reviews so they can offload these pieces of crap.
I finally discovered that I was turning the pot the wrong way. I turned it 15 times (ish) in the other direction and now I can set it perfectly to the voltage I want!