Topology Federmann, HQQF-55 ...

[BV]

Could also show a simulation with only gate voltage of both IRFP240 and IRFP9240 and output voltage of the amplifier, thank you!

Simulators do not make mistakes

Only peoples, who used them without real background.

[Upupa Epops]

We are not curious about your simulations, but about practical results...do not say, that you have not time to try it...something different discourage to you try it, probably you do not like firework...

[Federmann]

Add emitorových resistance 0.22Ω. I see that the effect of temperature on the reduction of current is smaller!
Emitter resistors suppress thermal effects RDS and highlight temperature effects VGS!

[PMA]

Originally Posted by Lumba Ogir

Michael,
you are apparently filled with a genuine sense of profound excitement for an underdeveloped idea, based on circulating marginated stereotype templates of random concepts, exacerbated by poorly substantiated technical suppositions and a neglectful, fragmentary cross-functional sequence analysis, lacking applicative-type structure norms and a reliable symptomatic long-term specificity, obscuring the outcome. You should, however, show your overwhelming but unfounded admiration in a calm and collected manner in oder to avoid finding yourself in the cumbersome situation of being threatened with a stiff bin time sentence.

Nice and decent post, perfect sense of humour. Thank you, Lumba. It could not be said better.

Cheers,
Pavel

[Upupa Epops]

Is it your practical experience ? Some pics from scope ?

[Federmann]

Add emitorových resistance 0.6Ω. Switched zener diodes. Emitter resistors suppress thermal effects RDS and highlight temperature effects VGS!

Negative branch has no temperature dependence. Positive branch at a higher temperature, more current flows! Now there is an explosion!

[PMA]

I give up this thread.

[Federmann]

Originally Posted by PMA

I give up this thread.

I can increase the emitter resistors to explode the negative branch.

I can generalize:

1) RE = 0Ω, the biggest positive influence of the temperature dependence RDS.
2) RE ≥ RDS, the suppression of the positive temperature dependence of the RDS and highlight the negative temperature dependence of VGS.
3) RE> RDS, negative temperature dependence VGS = unstable condition! Stability must be addressed else means.

[PMA]

Originally Posted by Federmann

Add emitorových resistance 0.22Ω.

Originally Posted by Federmann

3) RE> RDS, převládnutí negative temperature dependence VGS = unstable condition! Stability must be addressed else means.

Check your translator from Czech to English, you are mixing Czech and English language together.

[Ultima Thule]

Originally Posted by Federmann

I can increase the emitter resistors to explode the negative branch.

I can generalize:

1) RE = 0Ω, the biggest positive influence of the temperature dependence RDS.
2) RE ≥ RDS, the suppression of the positive temperature dependence of the RDS and highlight the negative temperature dependence of VGS.
3) RE> RDS, převládnutí negative temperature dependence VGS = unstable condition! Stability must be addressed else means.

Federmann,

let me tell you, the RDSon tempco effect is only valid when you are saturating the MOSFET, then you have Negative tempco, this works ONLY for Class-D / Switch Mode Power Supplies!

In the linear mode the RDSon has NO EFFECT on the tempco stability!

Cheers Michael