I am wanting to build a mule with 12x Bridgelux Thrive 2835 1W emitters that are 9V. The mcpcb I’ll be using has the emitters in parallel, so I am looking for something between 2A-3A.
If I can’t find a suitable driver I plan on using some SunLike 6V emitters. I already have a couple Convoy 6V drivers I could use, but I was really hoping to use the Thrive emitters.
It might be difficult to find a driver specified for 9V, some 6V or 12V drivers may work depending on their output voltage range, if not they can be modified by swapping a resistor, I talked about it here regarding the Noctigon boost driver : Reddit - Dive into anything
Now Hank does this modification for lower Vf red LEDs, so you could order one (by email, they’re not listed on the website) and ask specifically for a red led boost driver (2A).
On the Convoy FC40 driver the resistor to modify is the top one in the second picture : What did you mod today? - #10939 by Haukkeli
330K should do, but it’s possible it works without modification because its outputvoltage range is already mostly below 12V with the stock resistor.
Thanks for the links. I guess I should have searched harder.
I also found this thread about Simon’s XHP35 driver. If I’m understanding things correctly, I can swap R16 to a 376K that should get me 9V output. I’m guessing the FC40 driver is similar.
the FC40 one because there’s a chance it’ll work without modification, “not working” in this case would be the low mode higher than it should be.
They’re 0402 yes.
XHP35 driver has higher Vout range yes, with a higher value top FB resistor. (R16 in the shematic).
The FC40 driver can’t drive a XHP35 1st gen to full current, Vout range is too low.
That’s in constant voltage output, with the constant current regulation it goes higher, the three resistors R9 R16 R17 allow the voltage to swing across a certain range depending on the Op-amp output.