Welcome @VikramHCL, to the community!
Well, the L6598D in half‑bridge resonant topology could be used to realise a programmable 80W isolated supply for both models, provided the resonant tank, transformer and frequency range are carefully optimised for the required voltage and current ranges.
For Model 1 (3...63 V/5 A, 80W max) and Model 2 (3...23 V/20 A, 80W max), the feasibility depends mainly on the design of the LLC/resonant network, the transformer turns ratio and the allowed switching‑frequency span. In practice, such wide output‑voltage ranges might be achievable, but will require:
- a transformer carefully designed to avoid core saturation and excessive copper loss at low output voltages and high currents,
- appropriate current‑limit and power‑limit control across the whole range,
- and careful selection of the operating frequency window to keep the converter within safe stress and acceptable efficiency
Just a note: at very low switching frequencies, that is well below the resonance frequency, and under high load, the converter operates outside optimal ZVS conditions, which leads to higher losses and thus significant stress on the half-bridge switches, effectively limiting the usable voltage range.
The discussion of such a design probably concerns only your specific case and goes far beyond the scope of a thread intended for the general public. For detailed questions about the exact implementation, you should therefore contact your local distributor and request support from their FAE resource.
Hope that helps?
Good luck!
/Peter
