LT spice _ LM7812

[nescafe]

What is the substitute for LM7812 in LTspice ?
I can find any...

 

[Fred Abse]

What is the substitute for LM7812 in LTspice ?
I can find any...

http://www.ece.utah.edu/~ece2280/reg_zener.lib

 

[nescafe]

http://www.ece.utah.edu/~ece2280/reg_zener.lib

Thank you Fred.
Do you know where can I download:
- 4060N
- 4040N
- 4016N
- TC4420

 

[Fred Abse]

Thank you Fred.
Do you know where can I download:
- 4060N
- 4040N
- 4016N
- TC4420

Offhand, no.

4040 is in a library I have, which says it's from LTC, but I can't find it
on their site. I think it was posted here a while ago, maybe by John
Fields, but I don't really remember where I got it from. There's a similar
74HC library, too, same applies. Sorry, John, if it wasn't you.

The others you may have to make out of LTSpice raw logic "special
functions", with appropriate propagation delays and thresholds.

I don't use 4000 stuff much, if at all these days, so I've never looked
hard.

How to import this into lib ?

Put it into a directory where LTSpice can find it, and put:
..lib reg_zener.lib on your schematic. It's really a Pspice lib file, so it
might need tweaking a bit. Pspice lib files usually just run.

There's a 3-terminal regulator symbol in LTSpice that you could copy and
adapt, or you can draw your own.
RTFM

 

[Jamie]

Just curious, but why would you want to Spice an LM7812?

I suppose one may want a graphic that looks like a regulator with
three terminals and can sim a current source or adjustable source with
the control pin if desired.

All this can be done in a sub circuit using the primitive functions
and assigning a graphic to it.

Just an idea..

Jamie

 

[[email protected]]

Just curious, but why would you want to Spice an LM7812?

For instance, if you put a high power resistor in front of the 78xx in
order to dissipate some voltage (and hence power), does the 78xx
oscillate and if so, how large capacitor is needed between the
resistor and regulator.

 

[nescafe]

For instance, if you put a high power resistor in front of the 78xx in
order to dissipate some voltage (and hence power), does the 78xx
oscillate and if so, how large capacitor is needed between the
resistor and regulator.

-----
I'm building DC/DC converter and the schematics that we are using
includes :
- 4060N
- 4040N
- 4016N
- TC4420

If someone of you knows substitute for this parts, please write down.