Electronics > Projects, Designs, and Technical Stuff
diy 300W LED supply?
ETITsynthesizer:
cree xlamp. 37vF. 100W CoB LED. 3 of these in series so that they run current matched. this should simplify the supply. I started working on a SMD current regulated supply but it is not ready to post.
ejeffrey:
PLEASE EDIT THE THREAD TITLE TO SOMETHING MEANINGFUL
rvalente:
There are plenty of buck designs from various vendors, why making your life harder??
mariush:
If you don't necessarily need a linear driver, you could just use a led driver IC for each led.
For example, have a look at MP24833-A : https://www.monolithicpower.com/en/mp24833-a.html
Datasheet: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP24833-A/document_id/2070/
It's 1.12$ each and the rest of the components you'd need probably don't cost more than 2$
You can set the brightness between 0% and 100% by giving 0.67v...1.35v on the enable pin (a plain potentiometer will do) or you can pwm the value (100hz to 2 khz)
The catch is this chip only works with up to 55v, so you'd have to step down 110v AC to lower value... you'd probably be best with a standard 48v power supply, they cost as little as 40$, here's an example: https://www.digikey.com/product-detail/en/mean-well-usa-inc/LRS-350-48/1866-3350-ND/7705033
rvalente:
There is no sense making a linear driver when you can make an smps.
This IC is very easy to setup and with external mosfets and built in current protection, you can go crazy power.
https://www.infineon.com/dgdl/irs25401pbf.pdf?fileId=5546d462533600a40153567b06662826
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