Helmut,
I know you said "All the Darlington transistors in my examples correctly plot power" But that's not my issue.?
I can see the plot/s but I was thinking I would see?"dissipation" in watts as with BJT transistors or other non-sub circuits.?
I did download and run the TIP142 sub circuit files. I get the same thing.?"Left click to plot Q10 dissipation. V(c10)*Ix(Q10:C)+V(b10)*Ix(Q10:B)". But as I think I said earlier I was expecting "dissipation = XXXX" at the end of the formula.
Interestingly, I noticed that R2 said "dissipation = 0" but when I plot it I see about 850 mW for about 50 us at 50% duty cycle. So wouldn't there be some power dissipation here???
Although the plot (for dissipation) is very useful I guess I was thinking I would see a single value for power dissipation (probably RMS power) for that darlington or even R2.
What I am missing something??
Remember I am a beginner and?Thanks,
Brad
---In LTspice@..., <helmutsennewald@...> wrote :
Hello,
The power dissipation of the TIP142 from our Files section will be correctly displayed.
TIP_142_test.zip
Here are a few more examples. Their power will be displayed too.
All the Darlington transistors in my examples correctly plot power.?
In therory there are subcircuits possible where LTspice doesn't plot the power due to special combinations of sources internally connected to the pins of a subcircuit.
You should upload your files for a test.
Best regards,
Helmut
?
I download and ran the TIP142 sub circuit files. I get the same thing.?"Left click to plot Q10 dissipation. V(c10)*Ix(Q10:C)+V(b10)*Ix(Q10:B)" I can see the plot but I was thinking I would see "dissipation" in watts as with BJT transistors.
Interestingly, I noticed that R2 said "dissipation = 0" but when I plot it I see about 850 mW for about 50 us at 50% duty cycle. So wouldn't there be some power dissipation here???
Although the plot (for dissipation) is very useful I guess I was thinking I would see a single value for power dissipation (probably RMS power) for that darlington or even R2.
What I am missing something??
Thanks,
Brad
---In LTspice@..., <helmutsennewald@...> wrote :
Hello,
The power dissipation of the TIP142 from our Files section will be correctly displayed.
TIP_142_test.zip
Here are a few more examples. Their power will be displayed too.
All the Darlington transistors in my examples correctly plot power.?
In therory there are subcircuits possible where LTspice doesn't plot the power due to special combinations of sources internally connected to the pins of a subcircuit.
You should upload your files for a test.
Best regards,
Helmut
