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#181 | ||
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diyAudio Member
Join Date: Sep 2005
Location: Trnava, Slovakia
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Quote:
Quote:
Last edited by BV; 7th November 2009 at 08:50 AM. |
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#182 |
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diyAudio Member
Join Date: Aug 2003
Location: Prague,Czech Republic
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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...
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#183 |
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diyAudio Member
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#184 | |
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Design engineer, consultant
diyAudio Member
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Quote:
Cheers, Pavel
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Pavel Macura consultant |
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#185 |
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diyAudio Member
Join Date: Aug 2003
Location: Prague,Czech Republic
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Is it your practical experience ? Some pics from scope ?
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#186 |
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diyAudio Member
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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!
Last edited by Federmann; 7th November 2009 at 09:23 AM. |
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#187 |
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Design engineer, consultant
diyAudio Member
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I give up this thread.
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Pavel Macura consultant |
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#188 |
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diyAudio Member
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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. Last edited by Federmann; 7th November 2009 at 09:53 AM. |
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#189 |
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Design engineer, consultant
diyAudio Member
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Check your translator from Czech to English, you are mixing Czech and English language together.
__________________
Pavel Macura consultant |
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#190 | |
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diyAudio Member
Join Date: Jan 2004
Location: Koskenkorva Land
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Quote:
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
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"If transistors are blueberries and FETs are strawberries, then tubes must be.. pears" Michael 29th January 2010 |
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