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Quick simulation question
Quick simulation question
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Old 19th November 2019, 10:19 AM   #1
east electronics is offline east electronics  Greece
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Default Quick simulation question

i think most of us familiar with L10 amplifier see also schematic on picture

I have one application that I have primary rails of regulated supply to feed the first stages lets say up to the drivers and a lower rail very beefy to feed the output

Can one quick simulate for what is the maximum voltage to feed the input stage ?
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Old 19th November 2019, 01:24 PM   #2
sgrossklass is offline sgrossklass  Germany
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Ironically, this one cannot be determined by simulation (which rarely represents breakdown voltage accurately) but requires old-fashioned studying of datasheets instead. I think the 2SD667/2SB647 are the bottleneck, being Vceo = 80 V parts and having to swing almost rail to rail. So roughly +/- 40 V max, or +/-50 for 667A/647A. In the latter case a fault condition with the output pulled to V+ may still destroy Q6 (a 65 V part) and/or C4.
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Old 19th November 2019, 11:30 PM   #3
Ian Finch is offline Ian Finch  Australia
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Vceo max. may vary between manufacturers. Some examples of 2SD667A/B647A appear to use the same die as 2SD669A/2SB649A (as for example, do BD139/BC639). http://www.secosgmbh.com/datasheet/p...OD/2SD667A.pdf

There are even standard T092 versions of 2SD669/B649 to add to the confusion. Even with datasheets, I would test the breakdown voltage before fitting.
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Last edited by Ian Finch; 19th November 2019 at 11:34 PM.
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