TLC555: his simulation file can only simulate 0-400 us,because of TLC555

Yuetong,

First fix these errors.

Then fix that ground and analog ground don't appear to be connected properly.

After that we can help get it to run.

I already fixed it, but I realized
1, simulation is very slow, very slow.
2. The simulation time is limited. And the simulation is up to about 150ms, or a little higher. A little longer will report an error, not convergence, can not reach the second level,

6864.FINAL.TSC

Yuetong,

I'm not sure if warnings errors are fixed or muted. The signal flow is mostly left to right so I started removing things on right. To left of opto-coupler, the sim runs well and quick enough. I did have to connect AGND with GND, I used an ampere meter to see how much leakage flows.

Here is the left part; I'll continue trying to add back things.

final -20241119-4 (L).TSC

Here is a 20mS to 70ms result file in text format.

20ms-70ms.zip

Can you research and set up simulation parameters that would make the simulation run faster?

I also found an issue at U11, where the current through AM3 should be 1.23/10k according to the calculations, but it is higher due to U11. I tried replacing it with a TL062CPWR, but a2514.FINAL--MODITY-SLOW.TSCfter the replacement, I was unable to simulate the circuit. Could you please tell me what the reason is?

I will look into to this tomorrow.

I'm running the sim now. It should be complete by Monday.

Is there any progress now? There is current flowing into U11 input terminal, and the simulation is running slowly. Can it be sped up as soon as possible?

if i want output is 5V at 313 Ω input PT100,device parameter should be changed?

Yuetong,

Of course there is input current on U11. The data sheet say this is expected. try an op amp without these diodes. 

It can be sped up by testing sections separately or by substitution (replacing high frequency item with low frequency output).

yuetong said:

f i want output is 5V at 313 Ω input PT100,device parameter should be changed?

This is good to know. Previously I thought there was no input and you were trying to build a slow ramp output in the most complicated manner possible.

5V output at 313 ohms input is just half of the story; I expect you need different output voltage at some other input resistance. 

Have you considered using a linear isolation chip? letting the chip do all the hard work. 

This is a fast simulation way to check U11 circuit. DC solution display is easy here.  

can i use the this device to replace the 

OptoCoupler，the setting is 

Yes that will work.