TPS61023: Regarding PSpice errors

Hi Satoshi-san,

Is the 4th channel copied from the 1-3 channels?

If there are any changes in the 4th channel, can the 4th channel run successfully when all the 1-3 channels are removed?

Regards

Lei

Hi Lei,

Copy the 1 channel portion of channels 1 to 3.
In that case, the above error will occur and the simulator will stop.

The fourth channel only changes the output voltage.
Therefore, I think it will work normally.

Best regards
- satoshi
TPS61023_4ch.zip

Hi Satoshi-san,

This kind of simulation errors may be related with the computer operating system and memory distribution, it's usually very hard to debug.

It seems that the 4th channel in your application is relatively independent with the 1-3 channel. So please try to simulate the 4th channel separately if possible. For example, while simulate the 4th channel, remove the 1-3 channels and replace them with ideal voltage sources.

Regards

Lei 

Hi Lei,

The same symptoms occurred on other PCs.

I changed it to a two channel simulation.
It uses TPS61023 and TPS748901.

But I am getting an attachment error.
The simulation doesn't work either.

Both of them use the Pspice files provided by the manufacturer.
Are there any possible reasons for the error?

Best regards
- satoshi

0143.TPS7A8901RTJT.zip

Hello Satoshi,

There is a limit on the amount of measurements points when using pSpice for TI. Is the issue gone when you remove all measurement points from channels 1 to 3?

Best regards,
Brigitte

Hi Brigitte,

Reducing the measurement points does not change the behavior.
If there is a fourth channel, an error will occur.

Are there any restrictions on the number of nets?

Incidentally, if you change the TPS748901 to two channels, you can also simulate with 12 markers.

Best regards
- satoshi

TPS7A8901RT_4ch.zip

Hi Satoshi-san,

I run the startup file in "TPS61023_4ch.zip" you attached on "Cadence Capture 17.4", with only the following two changes:

1. Add SS = 0,
2. Adjust the simulation parameters slightly 

Then the 4-channel simulation can run successfully. The result is shown below

Please try the same 2 adjusts above on your simulation and run again. If there are still errors, I think the possible reason is than on PSpice for TI, the supported max number of simulation nets is limited.

By the way, based on the pictures you attached yesterday, there are license related errors, please try to solve it first.

Regards

Lei

Hi Lei,

In my simulation environment I get an error.
There may be a configuration error.
Can you send me a test file?

Also, a license error occurs when connecting two circuits.
It uses TPS61023 and TPS748901.
Ultimately, I want to connect the TPS61023 and TPS748901 and simulate them.
This will provide you with information about the license error that occurred at that time.

Best regards
- satoshi

Hi Satoshi-san,

I attached the simulation files of the TPS61023 - 4 channels for your reference.

This file is modified based on your file, with the only two changes mentioned in my last post. This file can run successfully on my side. 

6562.TPS61023_4ch.zip

I also tried to run the file "0143.TPS7A8901RTJT.zip" you attached, which contain both the TPS61023 and TPS748901.

There are no license related errors, but errors shown below:

Can the TPS748901 run successfully without the TPS61023?

Regards

Lei

Hi Lei,

Thank you for the reference file.

In my environment, an attachment error occurs.
It is the same error as the one I first inquired about.
Cadence was contacted by TI to request support, so I used E2E.
This is a problem that I am having trouble resolving.

Left: Errors occurring in circuit CAD Right: Errors occurring in the simulator

The TPS748901 is also attached as "TPS7A8901RT_4ch.zip".
This file uses two units to operate 4 channels.
No errors occur and simulation is also possible.

Best regards
- satoshi

Hi Satoshi,

TPS748901 is a LDO, which has simple internal circuit and less NETs than TPS61023.

Lei Zhong said:

This kind of simulation errors may be related with the computer operating system and memory distribution, it's usually very hard to debug.

It seems that the 4th channel in your application is relatively independent with the 1-3 channel. So please try to simulate the 4th channel separately if possible. For example, while simulate the 4th channel, remove the 1-3 channels and replace them with ideal voltage sources.

Does this work around make sense to you.

Regards,

Mulin