I have an eval board up and running now, and am looking at doing a higher power design (500W+).
I have the following questions:
1) Can the ADP1048 handle the control of a second stage converter as well? If so, does ADI have software similar to what was included with the ADP1048 eval kit? Is there a reference design I could look at?
2) If I layout my own board, and make sure the same connections are available to the ADP1048, I assume I can still use the GUI to help with programming. If that’s incorrect (or if there are caveats to that), let me know
3) I am also looking for ways of allowing the PFC_Vout voltage to be less than the peak of the line (i.e – something other than a boost converter). Ideally, I’d like to run from an input voltage of 90VAC to 305VAC, and have a PFC_Vo of something like 200VDC. To have enough capacitance for a 500W PFC stage, and rated for 500V would run me about $11-12. If, instead, I could get the PFC voltage down to 200V, it’d run me in the $3-$3.50 range. To do that, I’d need some kind of buck-boost converter, which isn’t inherently PF correcting, but I imagine you could do something if you had a chip like the adp1048. The other reason I’m interested in this is that we are looking at offering a 480VAC input driver in the future. There is some interest in that, and few available options on the market. If we have a 480VAC input, assume a 10% tolerance, I’d need to boost to 800V+ on the output of the PFC. I’d prefer to not have to do that, as components will be even more expensive.
Thanks very much,