simulating TI switchers

Oct 20, 2022 Last reply: 3 years ago 10 Replies
J

We are using TPS54302 and TPS562208. I haven't been able to get their Pspice models to work in LT Spice. They throw goofy errors, or run but at fs speeds and make no useful progress.



TI apparently has their own sim, Cadence maybe, that might run these parts.



Does anyone know how to do that, run the TI models with the TI software? Or to get the Pspice models to run usefully in LT Spice?



We have a few situations I'd like to check for load step response and maybe feedforward compensation in the feedback divider. We could pay a consultant to help, to save us breadboarding time.



Vote
Twitter Facebook LinkedIn
K

You can download "Pspice for TI". It is fully functional, only that is allows only TI models

Vote
Twitter Facebook LinkedIn
K

formatting link

Vote
Twitter Facebook LinkedIn
J

Yikes, another password login, install, learning curve. I'll assign a junior engineer to try all that.

One virtue of LT Spice is that it's an open download, free, unlicensed, non-brain damaged.

formatting link
All that needs to be tuned.

Thanks

Vote
Twitter Facebook LinkedIn
J

That's being phased out.

One of my guys installed their (brain-damaged) version of Pspice and it looks like it will work to sim our weird switchers. Of course my secondary switchers present a negative impedance load to the first one, so we'll have to sim all four together. Even funner.

Vote
Twitter Facebook LinkedIn
J

A single switcher runs at about a minute per millisecond. Four together will run a couple of useful sims per day, if that.

Vote
Twitter Facebook LinkedIn
P

Aren't there any eval boards?

Cheers

Phil Hobbs

Vote
Twitter Facebook LinkedIn
J

We have a couple. What I want to do is test my primary switcher, 12 or

24 volts down to +5, and then the three secondary switchers to 3.3, 1.8, and 1.0. The secondaries will present a negative load impedance to the primary, and we'll have a mess of bypass caps and ferrite beads everywhere.

I really want to sim all that, but we'll breadboard if we have to. It's about worth a proto board PCB layout. Eval boards are messy, every possible jumper option.

Vote
Twitter Facebook LinkedIn
L

mandag den 24. oktober 2022 kl. 21.41.25 UTC+2 skrev John Larkin:

JLPCB has both in stock for assembly, so you could probably get 5 board with parts and assembly for $50 in a week

Vote
Twitter Facebook LinkedIn
J

It would be convenient to buy a few boards assembled, but we could assemble them here. The PCB layout would be a minor nuisance, annoying because the TI sim is unusably slow.

Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required