LED driver topology proposal

Dear mps team,

I am currently assessing the feasibility of a project to determine its viability. The project requirements are as follows:

It involves designing an LED driver with the following specifications:

  1. Input voltage: AC or DC ranging from 12V to 48V.
  2. Output voltage and current: Capable of driving 11 or 22 LEDs in series within a voltage range of 19V to 82V at a constant current of 350mA.
  3. Efficiency exceeding 85%.
  4. Power Factor Correction (PFC) greater than 0.85.
  5. Operating temperature range of -40°C to 70°C, with storage temperature ranging from -60°C to 85°C.

I seek your guidance on the best topology for this project.

Should I consider a sequence of a filter and bridge rectifier, followed by a booster and PFC, or a buck converter, or perhaps an alternative approach?

The LEDs can be controlled by a microcontroller (MCU) and a separate LED driver, utilizing a simple op-amp and MOSFET circuit.

Furthermore, if I opt for a basic bridge rectifier for AC input, and the customer later desires to use DC inputs, I anticipate potential losses in this section.

Your input on the most suitable topology is highly valued.

You might consider LT3799. Really you have to get the spec a little more nailed down.