15W LED Driver Power Factor >95%
Posted by: schulle71
on
Hi,
I have to design a LED-supply with a power factor >95%
(90-270V input, 350mA 36V output). The valley fill Circuit seems to be suitable for >90%. Does anybody know a solution for this?
thanks Olaf
Valley fill for 15 W is going to be quite lossy.
Please take a look at the following example. This uses TOPswitch-GX for PFC based LED driver. Prototype is for a 20 W solution but a 12 V LED string so you will need to make a few changes to this circuit.
http://www.powerint.com/sites/default/files/PDFFiles/der168.pdf
Another example is for a 24 V string
http://www.powerint.com/sites/default/files/PDFFiles/der136.pdf