Hello , I want to implement the following negative regulator circuit with the following netlist.
Given the circuit simulation I chose the following component TL431ASA-7 as shown in the link below.
the netlistis not as the pin order of the chip,.
I have connected the chip as shown below,the input is -12V the output is -4V according the simulation.
I am afraid to mix the pins of this chip.
did I connect them correctly in the photo below?
Thanks.
https://www.digikey.com/en/products/detail/diodes-incorporated/TL431ASA-7/2510678

 

hi yef,
The Pin numbers on the datasheet are not the same assignment as the Node numbers on the LTSpice model.
Please post your LTS asc file and the TL431 sub file.

E

 

Hello Eric, simulation files are attached.
Is my layout correct for negative regulator?

 

hi yef,
Use this TL431A.lib, it has a number of TL variants.
Example of TL431A Vref

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You can use a text editor to view the TL431A.lib contents.

 

Hello Eric,I am using it as a negative regulator where the cathode is grounded.
is my layoutchipe schematics correct?

 

hi yef,
On your earlier post the IN is connected ro a Pulsed positive voltage source, how do you expect to create a Negative voltage reference?
E

 

Hello Eric, Yes you are correct something is wrong in the simulation precisly made.
I need negative input for the negative regulator.
I get errors when I am trying to impros the subckts in the file.
LTspice files are attached where did I go wrong?
How do I properly import this model.
I tried both .inc and .lib with the symbol and it give me bugs.
Thanks.

 

hi yef,
Place this tl431.mod in the same folder as your asc file and add tl431.mod text as per the previous example posted. [delete the add .txt extension, it has been added to enable the file upload]
E

 

@yef smith ,
Why not draw it like this way?

 

What a big difference a well-drawn schematic makes! The circuit is now easily understood.

 

Hello , I tried to run the simulation,
It says it could not open the file.
Where did I go wrong?
LTspice files are attached.
Thanks.

 

hi yef,
Please read my last post correctly.
Place this tl431.mod in the same folder as your asc file and add tl431.mod text as per the previous example posted. [delete the added .txt extension, it has been added to enable the file upload]

Edit the tl431.lib.txt file to read as tl431.lib Delete the .txt part

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I have edited your zip file to tl431.mod


My Error corrected by @panic mode Thx++

 

btw. i just tried it and it failed since looking for library file "TL431A.lib".
so i renamed TL431A_Modules.lib to TL431A.lib and then edited spice directive to use new name. then it worked.

 

Hello,the component is not working properly.
where load2 and load 3=1k I need to get 5V not 10V as shown below
2.5V(1+1k/1k)
Ltspice files are attached.

 

About negative reference voltage source.

btw. i just tried it and it failed since looking for library file "TL431A.lib".
so i renamed TL431A_Modules.lib to TL431A.lib and then edited spice directive to use new name. then it worked.

Hello,the component is not working properly.

Seems it is future of our civilization:
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hi yef,
Check this option.
Using a Ramped Vin to show the -5V regulation
E

 

Hello, when,I ran it I get tottaly different result as shown below.
could you reccomend other netlist file I could try?
Ltspice files are attached.

 

hi yef,
I suspect your TL431 model is incorrect???
E

 

hi yef,
These are the tl431A sub and tl431A. lib files I am using.
Create a new asy file from the sub file, do you know how to do that?
E

 

@yef smith ,
in file best_29_10_24.asc replace .lib "TL431A_models.lib" with .lib "TL431A.lib"