[volt-nuts] DAS-46

[Charles Steinmetz]

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