Jagd.Panther
New member
:UP:So I used the inrush limiter that you advised and now with about 1100W load connected, smps starts normally and I think It's good since My amplifiers protection takes about 2 or 3 seconds to connect the Subwoofers to amplifiers ouput
It's easy to estimate:I think now the protection set to about 15A at primary of the transformer since I can connect less than 2KW load without triggering the protection but not more than that
Is this good????
1st, calculate conduction loss for IGBT: Vce*Ice, according for 20A, 100degC Tj 2v*20 A= 40W.
2nd, calculate switching loss, (Ton+Toff)*Fsw at desired Ic , assuming you are using same Rg value as in the datsheet, you'll get 1.6mJ*55 khz=88W.
3rd, compare total dissipated power (^^^^ 1+2) taking into account derating factor (200W @ 100 Tc for FGL40N120AND, so 15A is safe).