Constant Voltage Isolated PFC Flyback

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We are looking at designing a two-stage LED driver design.  The first stage is an isolated AC-DC (90 - 305VAC) constant voltage stage that must meet Power Factor (>0.9) and THD (<20%) at 120VAC and 277VAC.  The output is 50VDC, 0.9A, 45W.  What would you recommend for a controller for this first stage?


The LYTSwitch product family does not meet your requirement since these products are for single-stage, but CC only applications. HiperPFS can provide a CV boost converter for the first stage, but it is usually for 100W above applications and maybe too much for your requirements