Tool/software:
Dear TI
I simulated LM70880 using PSpice of TI with settings below
Vin: 48V
Vout: 24V
Iout: 4A
Cin: 22u + 4.7u + 4.7u + 0.1u + 0.1u
Cvcc: 4.7u (default setting)
Rextcomp: 100k to VDDA (fdfault setting)
Rrt: 54.9k (Fsw = 400KHz)
Cboot: 47n
Rboot: 1
Lo: 22u
Rs: 8m
Rfb1: 290k
Rfb2: 10k
Cout: 10u + 10u + 10u + 10u + 0.1u + 0.1u
The simulation worked fine without any errors.
However, when I changed Lo to other values(18u, 20u, 24u, etc) other than 22uH, the simulation failed with a converge error.
I checked with the quickstart calculator and the calculation formulas in the datasheets,
and it seems that there will be no problem.
If you want, due to company policy, I can only send you the simulation files via email.
Please advice me.
Thanks,
Best regards
Shinyoung Kim
