Hello, it's my first post here, so I hope it's the right topic.

I want to build compact constant current laser/LED drivers for different diodes in 1.8-5A range. I managed to do it using linear regulators or operational amplifiers but both method was very inefficient and they didn't really fit in the laser/flashlight case, so now I want to build a driver using a step down buck regulator. I found this product:
https://images.bonanzastatic.com/afu/images/a3ee/bffa/bd89_7115368102/__57.jpg
It seems small and very easy to build, but I have no idea what regulator ic is used on this board because the labels are removed. So, my question is, does anybody know a constant current buck regulator ic which is easy to use and can be used for this purpose?

Thanks in advance!

 

This is going to sound silly but just scroll down I believe it'll get you some information..... This place is great... I hope it helps you

 

I've been developing a 10A laser driver. But after two samples were made, it turned out to be a problem. The laser current was regulated up to 5 Amperes, but when trying to increase the current at the level of 6 A, the driver went sharply to a current of about 5 A. The used chip is very complicated and I did not understand, and in one day I developed a more classical scheme and a month later received the manufactured driver with a current of up to 14 A. You can use my scheme:

 

I've been developing a 10A laser driver. But after two samples were made, it turned out to be a problem. The laser current was regulated up to 5 Amperes, but when trying to increase the current at the level of 6 A, the driver went sharply to a current of about 5 A.

The current-mode control of that chip doesn´t really help with regulating output current, it is more related to the peak inductor current. Best option would be to put a current shunt between ground and the diode, and feed this signal to the feedback pin (most likely amplified, because you don´t want to dissipate 1.25V*10A just in the current sense).

 

So I added an LC-filter on the way out: