LED driver from PFC bus (400V)

[eem2am]

Hello,

I do LED driver from PFC bus.

Vin = 400V
Vled string = ~100V
Iled = 0.5A
Need trafo isolation from mains

(one long led string)

Do you think this is more efficiently done with........

1. LLC LED driver?
2. Dual phase interleaved flybacks?

 

[Orson Cart]

LLC will certainly be easier with regard to EMC compliance, and you could use 2 x 500V fets in a half bridge and 150V diodes (schottkies), the flybacks will need HV mosfets and higher voltage diodes which nay give rise to lower efficiency, Regards, Orson Cart.