10m45s LTspice model

[dave slagle]

Title says it all. I googled around a bit with no luck. Does anybody have a spice model for the 10M45S?

thanks

dave

[dsavitsk]

Dave, It's just a depletion mode mosfet, and basically the same as a DN2540, if that helps.

[kenpeter]

http://www.ixyspower.com/PSpice_Mode..._Regulator.asp

10M90S pspice model might be close enough.

[rdf]

Originally posted by dsavitsk
Dave, It's just a depletion mode mosfet, and basically the same as a DN2540, if that helps.

Are you sure? Many times I've read it also contains an amplifier, never anything authoritative though.

edit: Is that P-Spice model LT compatible?

[dsavitsk]

Originally posted by rdf


Are you sure? Many times I've read it also contains an amplifier, never anything authoritative though.

I'm not sure of anything ... well, except that the 2540 will drop in as a replacement and that Walt Jung says they are both depletion mode mosfets.

http://www.audioxpress.com/magsdirx/...a/jung2779.pdf

Part one, for anyone that missed it is at http://www.audioxpress.com/magsdirx/...a/jung2778.pdf

[revintage]

I use the DN2540 model I got from Supertex website in LTSpice without problems.

[TheGimp]

I downloaded the supertex.lib file from their web site and usd a .lib directive to point to it.

.lib "C:\LTC Spice\Models\supertex.lib"

However, I get an error message "Only a level 9 B3SOI can have 5 nodes" when I try to run the simulation. Does anyone know what this is?

[TheGimp]

Nerry Mind.

Apparently there was a miss-match between the symbol file (*.asy) and the model in terms of pin specifications I had selected.

[Defiant]

I hope LT Spice does a better job with semiconductor models than it does with tube models. I ran curves on some Norman Koren models (5687 and 12AT7) and the lower negative grid voltage curves are all skewed and erratic.

I miss having access to HSpice

[Michael Koster]

All these parts are simple depletion mode MOSFETs. Someone guessed (IOW made it up) that they are ICs inside and that misinformation got echo chambered. Great example of "I read it somewhere". Why post information if you're not certain?

They are also NOT drop-in interchangeable. They will work similarly in some circuits but definitely not in all circuits.

Whether the model for one device can be substituted for another in Spice depends entirely on how sensitive the circuit is to the actual Vth and device capacitance etc. For example, a self-bias CCS using a different device may need to have a different value of Rs to achieve the same idle current.

The problem with bad results is in the models and not in the Spice platform. many models, especially tube models, are not very sophisticated and only model the device properly under the more common operating conditions.

cheers,

Michael