[volt-nuts] DAS-46

[Jerry Hancock]

Charles, thank you!  Very helpful, as everyone has been.


> On Jan 29, 2017, at 6:38 PM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
> 
> Jerry wrote:
> 
>> One of the items I am having trouble modeling is a CLD, current limiting diode, MCL1302.
> 
> CLDs are almost always operated in saturation, so a behavioral current source of the appropriate value should model it just fine for your needs (spec for the MCL1302 is 2mA +/- 0.6mA -- as you can see, hardly precision devices).
> 
> CLDs are nothing more than JFETs operating at Idss, so you can also model them with a JFET with its gate tied to its source. Of course, you have to try different FET models until you find one with the appropriate Idss, or play with source resistors to lower the saturation current of a FET with somewhat higher Idss.
> 
> But if you insist, Central Semi has models of its CLDs on its web site:
> 
> <https://www.centralsemi.com/content/engineering/spicemodels/index.php>
> 
> Central makes a direct substitute (the CMCL1302), but does not seem to have a Spice model for that particular one.  The CCL2000 is another 2mA CLD, with similar specs (but a somewhat tighter current variance spec).  You can find its P-Spice model here:
> 
> <http://www.centralsemi.com/docs/csm/CCLP.LIB>
> 
> I'm sure that model would be more than close enough for your purposes.
> 
> Best regards
> 
> Charles
> 
> 
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