On Fri, Apr 4, 2025 at 05:46 PM, Christopher Paul wrote:
The problem is that the notes in the T.I. model specifically state that it is NOT applicable to PSRR.
To be more precise, it says that PSRR Response "hasn't been modelled", whatever that means.? It might mean only that the effect may be there but nobody has calibrated or checked it yet for conformance with the specs.? But I'm guessing that it is more than that.
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The lack of mention of PSRR in the LM317 (not -A) model doesn't imply that PSRR is correctly modeled there.? Unfortunately, it doesn't mean anything.??No way to tell without trying it.
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... And since the standard LM317 one-resistor current source is essentially a two-terminal device, PSRR (characterized as supply voltage divided by load current) is identical to Zout, so that¡¯s out the window too.
I don't follow.
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Andy
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