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Reviews (1)
Jun 06, 2020
Good value, but applications may be limited
5 of 5 found this helpful I should've checked the driver datasheet and compare with the item photo. The item uses a 4.7uH inductor, which is too low unless you use this for 1.8V output according to the datasheet. This can be played with by other parameters, such as switching frequency and a compensation circuit though.
I started with 12V input and 5V output with a DMM, and thought it seems doing what it's supposed to do.
Then, I tried 12V input and 3.3V output. At a lighter load, no problem, but with a heavier load >1A, I noticed higher voltage than what it's set to. So, I pulled my o-scope. 0.1A load, no problem, seems reasonably quiet (< 20mV p-p). But at 1A load, it's basically ringing/oscillating, >800mV p-p. I tried a few different 12V power supplies, but nothing helped there. I looked into the item, and was thinking about changing the switching frequency or compensation circuit, but I don't have any SMD resistors or caps with me now, unfortunately. I added input caps, but didn't help. Finally, I saw a significant change when adding a 22uF AL-EL cap.
(Please note that even though I said I didn't see any issues with 12V input and 5V output, I didn't take a close look with an o-scope, so the similar issue may occur at different voltage setup, as well)
Lastly, I used the item with 5V input. It works with some load, but when no load, it again oscillates >1.5V p-p. I haven't looked up the driver's minimum head-room for input over output, but without load, it shouldn't behave like this.
In summary, do I recommend this item? No, unless you know what you are doing and what you are using it for. Good value, yes. Good quality? Assembly seems clean, but I'd have to say it's a questionable design. What if I design this? I would limit the application voltage range, or increase the board size so it can work better for wider voltage. Just my two cents.