mightydub

No worries, when you have a chance. I'd like to get someone to review the general approach to see if I'm missing something.

I have used both the stock OnSemi models and also the model from Andy_C that Bob Cordell used:

.MODEL njl3281dg_D d
+IS=2.20e-07 RS=0.01 N=2 EG=1.3
+XTI=2.3 BV=400 IBV=1e-05 CJO=2.1e-11
+VJ=1.5 M=0.65 FC=0.5 TT=5.2e-08
+KF=0 AF=1 mfg Onsemi_ThermalTrak_modified

If you have a model that you think is a better fit, please send it to me.

mightydub

Hi mightydub
I'm sorry, but I haven’t had time to look at in any closer.
BTW: what diode model are you using, the same as Bob?
His diode model is wrong.

stinius