hi Papa,
Same results as this recent Thread.
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https://forum.allaboutcircuits.com/...oost-convertor-in-ltspice.179564/post-1636703

 

Hmmm. I do remember that thread. I wonder if Alex will ride in over the horizon at the last moment to rescue the TS again. IMHO 24V to 180V is a pretty heavy lift. Does the TS know that he is pushing a rather large rock up a very steep hill?

 

Yes - pretty close. It is just passing the input to the output. there is no boost operation -- sorry.

Where do you think the problem is?

 

hi gok,
In the TPS40210 datasheet there is a typical example of a known working circuit,
I know that the design is different from yours, but it would be a good idea to create that circuit in LTS, at least it would prove the TPS model works!

If you do that please post your asc version of the typical circuit.

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hi gok,
This is what I see using that d/s circuit, note I have used a -Q version of a Net list from TI.
Created a Net list and Auto generated model.
The result suggests the TPS40210 model I have used works for this circuit.

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Where do you think the problem is?

At the moment I have no clue. It can be difficult to reverse engineer a design done by someone else, especially when the someone else may be an inscrutable piece of AI (Artificial Intelligence). Trying to infer the design requirements from just a non-working design can be incredibly challenging. I think you might need to go back to basics and try the model and the simulator on a known working design. In simulation , as in life it is important to learn how to crawl and walk before trying to run a marathon. There is a working design in the datasheet. You can modify the arrangement of pins on the symbol to match and save it as a separate symbol file. If that design proves unsuitable then maybe check for application notes. That is the way I would approach it.

 

hi gok,
In the TPS40210 datasheet there is a typical example of a known working circuit,
I know that the design is different from yours, but it would be a good idea to create that circuit in LTS, at least it would prove the TPS model works!View attachment 240874

If you do that please post your asc version of the typical circuit.

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Thank you

 

hi gok,

I cannot get my d/s LTSpice circuit to work correctly for 180Vout.

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hi gok,

I cannot get my d/s LTSpice circuit to work correctly for 180Vout.

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I kind of thought that might be a heavy lift for a boost converter, but since the design allegedly came from a TI design tool, I was reluctant to offer that opinion without trying the tool, which is on my to do list, but is not yet on the top, Does the datasheet give any clue about the maximum practical output voltage. IMHO 3or 4 to 1 sounds about right, but my experience with boost converters is somewhat limited. At those conversion ratios you're getting very nearly unusable amounts of output current, and the inductor will need to withstand extraordinary stresses.

 

hi,
As a follow up, I found this 'working' circuit for the TPS40210, specified as 12Vdc in and 180Vdc out.
Created a LTS schematic, the Vout swings between ~24V and ~300V at 100mSec intervals.

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