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Old 13th October 2013, 09:23 PM   #1
danny92 is offline danny92  Portugal
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Question How to simulate MOSFET output stage SOA curves at LTSpice?

Hi everyone,

I'm doing a project with a class AB/B power amplifier with MOSFET output and I'm thinking about incorporating a VI limiter to the output devices. It was told me that the curves can be made with the help of LTSpice, but I don't know the commands I should use. Can someone help me here?

Best regards,
Daniel
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Old 13th October 2013, 10:37 PM   #2
fas42 is offline fas42  Australia
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Haven't tried it myself, but if you join the Yahoo LTspice users group there is at least one example there of doing this sort of thing, http://groups.yahoo.com/neo/groups/L...urvetrace_SOA/.
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Old 14th October 2013, 07:23 AM   #3
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You need to join the Yahoo Groups to read the threads from the above post. But it is simply adding a trace to your characteristic curves, e.g., if the maximum dissipation is 10W, then add a trace with y=10/x, where x is the voltage.
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