LT spice _ LM7812

-- "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." (Richard Feynman)

Thank you Fred. Do you know where can I download:

- 4060N

- 4040N

- 4016N

- TC4420

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How to import this into lib ?

Thank you again.

Offhand, no.

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.

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

Have only this as "analog"... I have the others, but they're in PSpice logic format.

• 1 ANALOG INPUT
• 2 ANALOG OUTPUT
• 3 CONTROL
• 4 VDD (POSITIVE SUPPLY)
• 5 VSS (NEGATIVE SUPPLY)
• RINP 3 11 500 CINP 11 5 4P D1 11 4 D1 D2 5 11 D1
• M1 12 11 4 4 MP3U L=3U W=10U AD=768P AS=768P PD=208U PS=208U M2 12 11 5 5 MN3U L=3U W=4U AD=256P AS=256P PD=80U PS=80U
• M3 13 12 4 4 MP3U L=3U W=30U AD=3600P AS=3600P PD=900U PS=900U M4 13 12 5 5 MN3U L=3U W=10U AD=1080P AS=1080P PD=286U PS=286U
• M5 14 13 4 4 MP3U L=3U W=150U AD=256P AS=256P PD=80U PS=80U M6 14 13 5 5 MN3U L=3U W=50U AD=128P AS=128P PD=48U PS=48U

• .MODEL MN3U NMOS LEVEL=3 VTO=1.0 TOX=5E-8 NSUB=1E17

• .MODEL MP3U PMOS LEVEL=3 VTO=-1.0 TOX=5E-8 NSUB=3E15

• ISR=100.00E-12 BV=35.357 IBV=10U TT=5.0000E-9*
• .ENDS

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...Jim Thompson

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

--

John Larkin Highland Technology, Inc

jlarkin at highlandtechnology dot com

Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom laser drivers and controllers Photonics and fiberoptic TTL data links VME thermocouple, LVDT, synchro acquisition and simulation

I was thinking the same thing, unless you intend to use it for something unconventional, where the model might not work any way, I don't see the point

usually when someone ask for odd models for spice it is because they found a schematic and is trying to copy it verbatim to ltspice, trying to see what it does I guess

-Lasse

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

There's an LTSpice group on Yahoo that's pretty helpful.

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.

yes