F5 Turbo is posted

[EUVL]

Long time no hear. Hope all is fine.


Patrick

[Melon Head]

Originally Posted by EUVL

Long time no hear. Hope all is fine.


Patrick

Hello my friend.
I should be back for a while now.
Very happy to help you with anything

[EUVL]

If you are still interested in building the F5X, just drop me a mail.
We'll see what can be arranged.


Patrick

[Melon Head]

How is the chassis looking now?
I will be doing monoblocks.

[Melon Head]

Just word of warning Nelson.
You better be going to work early and staying back late everyday over next few weeks.
Something is in the mail.

[EUVL]

See here :

F5X -- the EUVL Approach


Patrick

[lhquam]

Originally Posted by Melon Head

Did you perform your simulation with 15V Peak on a 3 Ohm load ?

Yes, 15V peak, not peak-to-peak, into 3 ohms.

[lhquam]

Originally Posted by Melon Head

Post your results.
Do you have a model for MUR3020 ?

I could not find a model for the MUR3020, but used the MUR2020 instead. That could be the problem. Can you provide a Spice mode for the MUR3020?

[Melon Head]

.MODEL MUR3020wt D(IS=2.09832e-06 RS=0.0102995 N=2 EG=1.27539 XTI=0.5 BV=200 IBV=1e-05 CJO=1.14907e-09 VJ=0.4 M=0.888092 FC=0.5 TT=7.76886e-08 KF=0 AF=1)

[lhquam]

Originally Posted by Melon Head

.MODEL MUR3020wt D(IS=2.09832e-06 RS=0.0102995 N=2 EG=1.27539 XTI=0.5 BV=200 IBV=1e-05 CJO=1.14907e-09 VJ=0.4 M=0.888092 FC=0.5 TT=7.76886e-08 KF=0 AF=1)

Thanks for the Spice model. I now get THD plots very similar to yours. The main difference is that my 2nd harmonic is higher than yours in both cases. Could be due to differences in Spice models for the IRFP240/IRFP9240 MOSFETs, or slight differences in biasing. My biasing looks good: it required careful adjustment to get 15 V peak without leaving class-A.