UCD3138ALLCEVM150: I'm using "UCD3138ALLCEVM150" evaluation board. monitoring ucd3138a with " Fuison Digital Power Studio". I have trouble with changing switching frequency on design

Dogan Birdal

Part Number: UCD3138ALLCEVM150
Other Parts Discussed in Thread: UCD3138A

Hello,

I'm using "UCD3138ALLCEVM150" evaluation board. monitoring ucd3138a with " Fuison Digital Power Studio". I have trouble with changing switching frequency on design. Attached file you can see my design configuration as i change modify board power stage for 450 KHz rezonans frequency and update " design parameters on fusion" but while controller running switching frequency operates at 149 KHz. Can you please let me know if i can chance switching frtequency by using " Fuison " interface without using code composer?DC-DC LLC @ Address 89d Deneme2.xml

over 4 years ago

0 Ian Bower over 4 years ago

TI__Genius 17090 points

There's no way to set the switching frequency on the LLC. The switching frequency command is designed for topologies which run at fixed frequencies. With LLC, the frequency is varied depending on Vin and the load. The code supports a range of frequencies matched to the characteristics of the specific LLC network on the board. There's no way supported in the PMBus commands to reconfigure an LLC for a different network. There's no way to do it for the EVM without changing things in Code Composer Studio.

0 Dogan Birdal over 4 years ago in reply to Ian Bower

Prodigy 180 points

Do you have detail document for configure switching frequency on code composer?

0 Ian Bower over 4 years ago in reply to Dogan Birdal

TI__Genius 17090 points

I've got an old preliminary document on the LLC firmware that has some information. You'll also probably need to adjust things like the compensation and the dead times with a different circuit. I'll figure out how to send it to you.