TL431 Simulation help needed in LT Spice

Thread Starter

mishra87

Joined Jan 17, 2016
1,039
Hi Guys,

I am trying to simulate the TL431 for for 4V output but i couldn't.
Can anyone help me out here ?

I do not find TL431 for LT Spice database so i use LT1009.
TL431 reference is at 2.5V and not i want to generate 4V output.

Could anyone guide me how to add TL431 in database and generate 4V at output ?

1596706580292.png



Thanks,
 

Alec_t

Joined Sep 17, 2013
14,329
After unzipping the files, if you're running LTspiceXV11 under Win10 you can use Control Panel to add the paths to those files, or you can copy the sub file to your ...User/Documents/LTspiceXV11/lib/sub folder and the asy file to an appropriate ...User/Documents/LTspiceXV11/lib/sym/ sub-folder.
 

ericgibbs

Joined Jan 29, 2010
18,864
hi m,
I upgraded the TL431.zip to TL431a.zip to add the 'mod' see my earlier post, download the tl431a.zip and extract the mod file.
E
 

Thread Starter

mishra87

Joined Jan 17, 2016
1,039
hi m,
I upgraded the TL431.zip to TL431a.zip to add the 'mod' see my earlier post, download the tl431a.zip and extract the mod file.
E
Thank you so much !
It worked with these files. Now i got know exporting 3rd party model in LT Spice.

Is there there anyway to write a model for any components ?
Lets say i want to write a model for TL431, how to i write.

The 3 files are needed for simulation.
.Sym
.Lib
.Mod

I am highly interested to learn.
 

OBW0549

Joined Mar 2, 2015
3,566
I do not find TL431 for LT Spice database so i use LT1009.
Just for future reference, the LT1009 can NOT be used as a replacement for the TL431. The third terminal on an LT1009 isn't there to program the voltage as it is with the TL431; rather, it's a "trim" input that allows the LT1009's voltage to by adjusted by up to ±5% to correct for manufacturing tolerances or other tolerances in the application circuit.

Always read a part's data sheet before you attempt to use it. You'll save yourself a lot of trouble.
 

ericgibbs

Joined Jan 29, 2010
18,864
hi Carl,
That 2nd circuit is one I posted [post #2] together with the TL431 zip, so that the TS could do a quick test of the unzipped TL431 files, its not related to the TS circuit.
Eric
 

ci139

Joined Jul 11, 2016
1,898
TL431 like thingy :
Code:
* Experimental Spice Model of
*$
* last modified 2017.09.11 - 17:27 UTC+3h CE
* x x 4 3 1 x x Shunting Voltage Regulator
* * * * * * * FbAnCa* * *
.SUBCKT AZ431 1 2 3
* - - - - - - R A C - - *
** Resistors **
R1 13 14 {jRo*25}
R2 14 12 {jRo*24}
R3 14 15 {jRo*24}
R4 16 2 {jRo*3.4}
R5 12 17 {jRo*2.7}
R6 8 10 {jRo*11}
R7 3 5 {jRo*1.8}
R8 3 6 {jRo*1.8}
R9 9 11 {jRo*.33}
R10 11 2 {jRo*48}
** Capacitors **
C1 15 10 20p
C2 3 4 20p
** Diodes **
D1 2 4 AZrppPd
D2 2 3 AZrppPd
** Transistors **
** PNP **
Q8 7 7 5 AZsdtmP {jSa*2}
Q9 4 7 6 AZsdtmP {jSa*1}
** NPN *
Q1 4 17 2 AZsdtmN {jSa*1}
Q2 3 1 13 AZsdtmN {jSa*2}
Q3 4 4 1 AZsdtmN {jSa*3}
Q4 12 12 2 AZsdtmN {jSa*.9}
Q5 15 12 16 AZsdtmN {jSa*7.2}
Q6 10 15 2 AZsdtmN {jSa*1}
Q7 7 13 8 AZsdtmN {jSa*1}
Q10 3 4 9 AZsdtmN {jSa*2.5}
Q11 3 11 2 AZsdtmN {jSa*50}
** Parameters **
.param jRo={4k/9}
** -
.param jSa={(1/50)*(1k85/700)}
** Models **
** 1N4148 **
.model AZrppPd D(Is=2.52n Rs=.568
+ N=1.752 Cjo=4p M=.4 tt=20n
+ Iave=200m Vpk=75 mfg=OnSemi type=silicon)
** 2N2222 BF=200 **
.model AZsdtmN NPN(IS=1E-14 VAF=100
+ BF=180 IKF=0.3 XTB=1.5 BR=3
+ CJC=8E-12 CJE=25E-12 TR=100E-9 TF=400E-12
+ ITF=1 VTF=2 XTF=3 RB=10 RC=.3 RE=.2 Vceo=30
+ Icrating=800m  mfg=Philips)
** 2N2907 BF=250 **
.model AZsdtmP PNP(IS=1E-14 VAF=120
+ BF=180 IKF=0.3 XTB=1.5 BR=3
+ CJC=8E-12 CJE=30E-12 TR=100E-9 TF=400E-12
+ ITF=1 VTF=2 XTF=3 RB=10 RC=.3 RE=.2 Vceo=40
+ Icrating=600m mfg=Philips)
.ENDS AZ431
*$
+ there are more at
http://ltwiki.org/index.php?title=Components_Library_and_Circuits
+ one included in http://ltwiki.org/index.php?title=S...r_Configuration_with_an_Accurate_TL431A_Model
 
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