Hello, I designed and manufactured a PFC circuit with a L4984D for 400V 800W output. I tested it until 860W with a resistive load and function ok. I need to power with it a 600W, 400V to 24V DCDC. This second step consist of a full bridge with a transformer (Lp=1.3mH, Lleak=5uH, Rp=100mohm), when I tested it without final load the PFC achieves 400V, but when I connect a minimal load (50W) it falls down to 360V, up to 320V with more power output. can someone help me to solve this problem?
