Dear Team,

I am simulating the below circuit using LTspice.In this circuit you can see that a MUX/DMUX is driving a BJT.
My expected output is 3V at Vout node.
When I am simulating this circuit it is taking lond time.I pressed ESC to end but at that time output is not
coming as expected.
May I know what happened.Please find the attached Ltspice file and PSPICE model of TMUX1308

Regards
HARi

 

hi HARi,
You did not include the asy symbol for the PAD
E

Update:
Re-check your zip folder

 

hi HARi,
You did not include the asy symbol for the PAD
E

Update:
Re-check your zip folder

Hi Eric,

I downloaded the model from Here

https://www.ti.com/product/TMUX1308#design-development

and created the symbol using LTspice autosymbol generation method.

May i know what I need to do next

Regards
HARI

 

hi H,
The asy file will be in your AutoGenerated folder under Sym.

I will download the 'ti' link as well.
E

 

hi H,
Got it, created the model OK,will run the sim.
E

 

hi H,
Got it, created the model OK,will run the sim.
E

Thank you Eric,it will be very helpful if you can try from your end also

 

hi,
When run I get this Error.
E

 

May be a model issue...
Thank you very much for your time...

 

Not sure if it has any bearing on the problem here, but in the Pspice model THERMALPAD seems unconnected.

 

Dear Team,

I am simulating the below circuit using LTspice.In this circuit you can see that a MUX/DMUX is driving a BJT.
My expected output is 3V at Vout node.
When I am simulating this circuit it is taking lond time.I pressed ESC to end but at that time output is not
coming as expected.
May I know what happened.Please find the attached Ltspice file and PSPICE model of TMUX1308
View attachment 256304
Regards
HARi

You have a node labeled 5V at the junction of R2/S1 but you do not have a voltage source labeled 5V.
Attach a node label named 5V to the output of V1.

Also,

Use this .tran statement:

.tran 1m startup

 

Thank you..
Now it is working.
May I know what this command is doing " .tran 1m startup "

 

Thank you..
Now it is working.
May I know what this command is doing " .tran 1m startup "

It ramps up all voltage sources from 0 to the specified voltage in 20u Sec

 

Hi Eric,

I downloaded the model from Here

https://www.ti.com/product/TMUX1308#design-development

and created the symbol using LTspice autosymbol generation method.

May i know what I need to do next

Regards
HARI

Can you explain how you succes to created the symbol using LTspice autosymbol generation method?

Thank you!

 

Hi N200,
Download TMUX1308 Spice model from that link.
Unzip it [ I unzip to my desktop]
Locate the TMUC1308.lib , copy it to your desktop, rename it to TMCU1308.sub

Run LTS and open the TMCU1308.sub file [ you will have to click bottom right to see and select All types]
scroll down the listing until this line.

.SUBCKT TMUX1308 S4 S6 D S7 S5 EN NC GND A2 A1 A0 S3 S0 S1 S2 VDD THERMALPAD
Right click on it.

Then select Create Symbol


E

 

Hi N200,

Please see the below video.

Regards
HA

 

Hi N200,
Download TMUX1308 Spice model from that link.
Unzip it [ I unzip to my desktop]
Locate the TMUC1308.lib , copy it to your desktop, rename it to TMCU1308.sub

Run LTS and open the TMCU1308.sub file [ you will have to click bottom right to see and select All types]
scroll down the listing until this line.

.SUBCKT TMUX1308 S4 S6 D S7 S5 EN NC GND A2 A1 A0 S3 S0 S1 S2 VDD THERMALPAD
Right click on it.

Then select Create Symbol


E

View attachment 299499

Hello

Thank you very much it is working,in the meantime I did something else, only now I took the steps you told me
Thank you for fast reply