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Old 3rd October 2007, 08:37 AM   #1
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Default LM1875 ltspice model

Does anyone have a ltspice model of the lm1875 from national?
they used to print a spice model in the data sheet IIRC, but I can't find it anymore.
all help gratefully appreciated
TIA
Anthony
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Old 31st October 2007, 09:12 PM   #2
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May this can help you: Laplace expression for small-signal can be used to investigate feedback and stability of the LM1875.

The expression that I use in a Laplace block in SIMetrix (evaluation version is sufficient) is:
73000000/(s+2500)/(1e-7*s+1)/(2e-8*s+1)

This is of course a very rough simplification. The Boucherot compensation for inductive output compensation can NOT be investigated with this simple model.

FS
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Old 2nd November 2007, 05:58 AM   #3
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Thanks for this-
its the model with the compensation I was after- have modeled it with an adjusted op amp, but I want to investigate the stability margins.
regards
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