...The ST Micro L6384-L6387 series aren’t controllers at all – they are an older family of high-voltage gate drivers – suitable for high or low-side gate drive of FETs run off a high-voltage rail.
Sorry about that. I am not sure where I pulled those part numbers from but I was actually
looking at ST Micro's setup for L6599 and L6598.
So all of the controllers I am finding for off line applications are resonant half bridge which seems to be only different in regard to an additional reactive component(capacitor or inductor) before the transformer. What are the advantages/trade-offs.
I have another controller to add to the list from linear Tech though it doesn't look like its technically a half bridge topology(LT1509).
One thing that has been bothering me came to light when reading AN2530 from ST Micro regarding the L6598(see attached plot). The converter efficiency takes a massive hit when PFC is added. Most remarkably in the range of 30-80W. In your experience is this typical? I would say that I usually would be using this lower range of power with an occasional spike up to the higher levels so this efficiency trend is really backward of what would be ideal.
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