Cant get the TPS54331 to simulate properly in Tina-TI

HPB

Other Parts Discussed in Thread: TPS54331, TINA-TI

Hi, I designed a 12V supply using the SwitcherPro desktop version and the TPS54331. I tried simulating this in Tina-TI and everything worked fine until I added in a load of 1.1R (this is also present in the original schematic available on the product webpage). I've attached the schematic here. Can anyone please tell me what I seem to be doing wrong here?

TPS54331-02.zip

over 11 years ago

0 JohnTucker over 11 years ago

TI__Guru**** 191445 points

Can you post your TINA TSC file?

0 JohnTucker over 11 years ago in reply to JohnTucker

TI__Guru**** 191445 points

never mind I see it isn the zip file...

0 HPB over 11 years ago in reply to JohnTucker

Expert 1350 points

Right, its in the zip file. I also forgot to add that I'm powering it with a rectified bridge. The voltage source mimicks the secondary of a transformer. Vin min is 15v and vin max is 18v (rms).

0 JohnTucker over 11 years ago in reply to HPB

TI__Guru**** 191445 points

That files seems to run ok for me. Can you elaborate on your problem?

0 HPB over 11 years ago in reply to JohnTucker

Expert 1350 points

The output voltage is supposed to be 12V but here the Vout is not even 3V. I've attached the waveforms here. The moment I remove the Rload at Vout, everything works great.

0 JohnTucker over 11 years ago in reply to HPB

TI__Guru**** 191445 points

1.1 ohm and 12 V = 10.9 A output , try reducing Rload to 12 ohm

0 JohnTucker over 11 years ago in reply to JohnTucker

TI__Guru**** 191445 points

Itried it with 12 ohm and it works fine with 12 V output. You just had too much load.

0 HPB over 11 years ago in reply to JohnTucker

Expert 1350 points

Thanks John. What kind of output currents are possible at 12V outputs with this IC? I was under the impression this was a 3A output device. Or is that only for lower output voltages?

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Cant get the TPS54331 to simulate properly in Tina-TI