UCC38085: HALF BRIDGE LLC DESIGN CLOSED LOOP SIMULATION

Alper Çimendağ

Part Number: UCC38085
Other Parts Discussed in Thread: UCC256402

Hello,

I am trying to make open loop simulasion for a LLC circuit. I am confused at some point. I am designing my half bridge LLC converter for a specific output voltage of 12V at 250W. Then I change the load(input voltage is the same) and redo my calculation to find new switching frequency. Output voltage is not 12V but far away from it. So, I think I do not know how to calculate new switching frequency at different laods with the same input voltage. I have read all application notes available and none helps.

Does TI provide LLC controller SPICE model? I could not find it. TI LLC controller SPICE model or solution proposal to my above problem would be appreciated.

Thanks,

Alper

over 2 years ago

0 Mike O' over 2 years ago

TI__Guru* 86206 points

Hello,

I don't think the UCC38085 is the correct controller for designing an LLC.

The UCC256402 is an LLC half bridge controller that should work for your application. The following link will bring you to the product folder that has a Webench and Excel design tool for design LLC half bridge converters.

https://www.ti.com/product/UCC256402?keyMatch=UCC256402&tisearch=search-everything&usecase=GPN#design-development

If you have questions on how to design with the UCC256402, please, repost in a new thread with the UCC256402 in the thread title. In this way we can assign the appropriate applications engineer to help you in your design process.

If this resolved you issue. Please check resolved at the end of thread.

Regards,

Mike

0 Mike O' over 2 years ago in reply to Mike O'

TI__Guru* 86206 points

Hello,

Just checking in. Did this resole your issue? If it did could you please hit resolved at the end of thread?

Regards and Thanks,

Power management

Power management forum

UCC38085: HALF BRIDGE LLC DESIGN CLOSED LOOP SIMULATION