UCC28950: Tina simulation turn off component with 24V output after 6ms

Eze Bayer

Part Number: UCC28950

Hello, I simulated UCC28950 in TINA based in the sample of this component, but changing some componentes to duplicate output voltage, L1=33u, T2=12:1, R6=20K. The simulation start well and goes to 24V but after 6ms it turn off and I don't know why. Could anyebody help me to know why? Thanks

over 4 years ago

0 Yunsheng Qu over 4 years ago

TI__Genius 9790 points

Hi, Eze

Thanks for your interest in TI here. I will be happy to route your request into the appropriate expect to support. Please note the team that supports this device is in the US so they will have a delayed response due to the US holiday.

Yunsheng

0 Eze Bayer over 4 years ago in reply to Yunsheng Qu

Prodigy 150 points

thanks Yunsheng, I will wait their reply.

Regards

0 Mike O' over 4 years ago in reply to Eze Bayer

TI__Guru* 86266 points

Hello,

The issue just might be due to resolution in the time base setting. I would try to decrease the sample step size to see if it improves.

Regareds,

0 Eze Bayer over 4 years ago in reply to Mike O'

Prodigy 150 points

Thanks Mike, how can I decrease this parameter? I can't find it

0 Don Dapkus over 4 years ago in reply to Eze Bayer

TI__Guru**** 189401 points

Hi, Eze,

Check this post:

0 Eze Bayer over 4 years ago in reply to Don Dapkus

Prodigy 150 points

hello, I changed the simulation parameters but the problem continue, I would like to be quiet that it is only a simulation problem so that I can close my design and go to manufacturing.

Could you tell me if the simulation parameters are okay? or if there is any problem using the design with the changes I made for 24VDC output?

Thanks

0 Eze Bayer over 4 years ago in reply to Eze Bayer

Prodigy 150 points

there seems to be a problem with the image

thanks

0 Mike O' over 4 years ago in reply to Eze Bayer

TI__Guru* 86266 points

Hello,

Thank you for patients with this issue and the software team is working on the issue.

The data sheet equations for the turn on delays are correct and the devices are even maintained to make sure they are correct.

So I believe your design is working correctly.

Regards,

0 Eze Bayer over 4 years ago in reply to Mike O'

Prodigy 150 points

Hello, thanks for the answer, I will wait the results of the team. 
I would like to ask you another question, do you know any commercial transformer with a 12:1:1 ratio or similar to obtain 24VDC-25A at the output?
Regards

0 Mike O' over 4 years ago in reply to Eze Bayer

TI__Guru* 86266 points

Hello,

When it comes to phase shifted full bridge converters generally the transformers are custom made. I have good luck with having transformers being manufactured for these applications using Wurth and Renco. You could try asking if they good design a transformer for your application?

Regards,

0 Eze Bayer over 4 years ago in reply to Mike O'

Prodigy 150 points

thanks for your support, i would like to ask if you have an AC-DC reference design (400V, 600W or more) for complement this voltage source? I've been searching but only found application notes with 300W output. Thanks

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UCC28950: Tina simulation turn off component with 24V output after 6ms