UCC28950 -- LTSpice model

marcel hendrix

Other Parts Discussed in Thread: UCC28950

Is an LTSpice model of the UCC28950 available?

I am using the TINA simulator now because it has the encrypted UCC28950 model, but the learning curve of this simulator is very steep and awkward (for one used to LTSpice).

over 11 years ago

0 Mike O' over 11 years ago

TI__Guru 66065 points

Sorry TI is not licensed to make LTSpice models.

0 marcel hendrix over 11 years ago in reply to Mike O'

Prodigy 50 points

Mike 1414007 said:

Sorry TI is not licensed to make LTSpice models.

No license is needed: just encrypt TI's PSpice .subckt with the LTSpice built-in tool and your IP will be as secure as it is now. I am not asking for an UCC28950 model that uses LTSpice proprietary code blocks, nor am I requesting to have an unencrypted model.

0 Florian Finsterbusch over 10 years ago in reply to marcel hendrix

Prodigy 80 points

Hello Mike,

I'm also using TI-TINA for simulating the UCCC28950.

Compared to LTSpice a lot of jobs are much more complicate (select a trace for viewing, viewing power, RMS and average values)
And some things I could not manage (for example to view a sliding RMS value).
Also the documentation for the advanced topics is very poor.
In one sentence: I'm very disappointed from TI-TINA and unhappy to be forced to use this tool ...

Is there a chance that TI builds an encrypted subcurcuit for the UCC28950 to be used with LTSpice as suggested by Marcel?

Regards, Florian

0 Mike O' over 10 years ago in reply to Florian Finsterbusch

TI__Guru 66065 points

I don't believe so. TI's eLab handles all of the Spice and Tina related support.

Regards,

0 Hakan Uenlue over 10 years ago in reply to Florian Finsterbusch

Prodigy 10 points

I kindly agree with Florian.

By not giving open Spice Syntax (under .subckt), TI is pushing away the designers from using the parts.

0 ziopaper over 10 years ago in reply to Hakan Uenlue

Intellectual 940 points

Hello,

does it work if you download the pspice average (or transient) model and copy the .subckt part from inside the .lib file? you can paste that into ltspice and you will have your part, correct? (I didn't do it, so not 100% sure)

0 marcel hendrix over 10 years ago in reply to ziopaper

Prodigy 50 points

No, the information in the .lib is encrypted. It can only be read by Pspice or TINA.

This development seriously worries me. I respect TI's desire to protect its IP, but they should not limit my desire to use the best tools there are.

-marcel

0 ziopaper over 10 years ago in reply to marcel hendrix

Intellectual 940 points

you are right, I was confused by the fact that ltspice actually allows my to create a symbol from the subckt directive. It recognize pinout correctly but when trying to run the simulation gives an error "too few nodes".

In another post, they suggested to request the unencripted model to your local AFA (?). See last post here

http://e2e.ti.com/support/development_tools/webench_design_center/f/234/t/225538.aspx

0 marcel hendrix over 10 years ago in reply to ziopaper

Prodigy 50 points

Thanks for the link. It seems it might involve an NDA, and therefore it is only feasible for parts there is absolutely no replacement for.

-marcel

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UCC28950 -- LTSpice model