UCC25660: Maximum frequency

Hello,

I reviewed the data sheet and the frequency rang is 50 kHz to 750 kHz.  This means the maximum switching frequency should be 750 kHz.

Regards,

Hi Mike,

Does that mean that the upper limit of the resonant frequency is around 300kHz?

Best regards,

Hello,

Typically these are designed for 100 to 200 kHz for the resonant frequency.   I have not seen 300 kHz designs.

Regards,

Hi Mike,

I heard that a 300kHz reference design was being produced, so I wanted to check the highest frequency.
Is the resonant frequency the same as the previous LLC controller?

Best regards,

Hello,

What previous LLC controller are you comparing this too?

If you design the resonant frequency to 300 kHz that is O.K. if you choose to do so.   However, you need to remember that the maximum frequency is 750 kHz.  You just need to use the design calculator to check your transfer function to ensure the gain meets your needs.

https://www.ti.com/tool/UCC25600-DESIGN-CALC

Regards,

Hi Mike,

The previous LLC controller is UCC2564xx.

I am considering increasing the frequency to make it more compact.

Best regards,