Hey Guys,

I'm kind of stuck while making my High Powered LED project

I need to cool down a heatsink with a fan with the specification of:
12v and 0.22A

The led driver is outputting:
42v and 2.1A

for a LED Module requiring exactly:
42v and 2.1A

I'm thinking of using a switching voltage regulator (LM2575HV-12) fed from the LED driver output and worked out all the components needed for that.

One thing I cant get my head around is:
Do I need to find a LED driver with a higher voltage and same current output since I have 42v requied by the LED and 12v required by the fan?

or do I stick with the 42v from the led driver and that should give the LED exactly 42v and 2.1A and the fan whatever it needs?

Cant get my head around it and I know its a silly question hehe
Help would be so grateful people!

 

Buy a Meanwell LPF-90D-48 (and a 100K potentiometer if you would like manual dimming on this LED module)
Then buy a 12V @500mA or greater "wall wart" type power supply.

Run the LED on the meanwell and the fan on the 12V supply.

Done.. nice and simple

 

I cant use a wall wart is that the wiring will go inside a case which cannot hold a socket and plugs.
Yes it would be really simple if i could do it

But really need another solution if please someone could help.

http://www.ebay.co.uk/itm/New-brands-LED-Power-Supply-Driver-Transformer-0-5-15w-12v-1A-DC-CE-
RoHS-/151160520179?pt=UK_Home_Garden_Lighting_Parts&hash=item2331de7df3

How about something like that? Will it work with a fan?

 

Or even better in my eyes:

http://www.ebay.co.uk/itm/IP67-Wate...pt=UK_Light_Fittings&var=&hash=item51ad9cc624

Would that work with a 12v 0.2a fan?

 

Ok then instead of the wall wart just use this inside the box
http://www.mpja.com/12-Volt-Power-Supply-2A-Switching-Hitron/productinfo/18595 PS/

Just bring 1 power cord into the case and split it to feed the 12V power supply and the meanwell LED driver..

 

I live in uk, sorry to be a pain hehehe.

So those option above i linked? What you think of them?

 

Sorry mcgyvr I don't have the privileges to PM you and ask if the above was ok.

So will:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=151160520179&ssPageName=ADME:X:RTQ:GB:1123

Or


http://www.ebay.co.uk/itm/New-brand...me_Garden_Lighting_Parts&hash =item2331de7df3

work for a 12v 0.22A fan?

 

Sorry mcgyvr I don't have the privileges to PM you and ask if the above was ok.

So will:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=151160520179&ssPageName=ADME:X:RTQ:GB:1123

Or


http://www.ebay.co.uk/itm/New-brand...me_Garden_Lighting_Parts&hash =item2331de7df3

work for a 12v 0.22A fan?

A fan requires a "constant voltage" power supply..
An LED requires a "constant current" power supply..

Those Chinese "LED Drivers" are usually deceiving/inadequately marketed.. They do not clearly state if they are constant current or constant voltage.
So the answer is "maybe"..

To power the FAN you simply need a 12V "constant voltage" supply with a current rating higher than what the fan needs.. (A fan will only draw as much current as it needs so having a power supply rated higher than the fan is just fine) Personally I would find a 12V @500mA or greater power supply.