Develop 12v 35A PSU with adjustable output

[AlbertoTG11]

Good morning,

i have to develop an 220v ac to 12V 35A cc adjustable psu. This device must have current limiting for output.

Searching on nxp site i found this board

https://www.nxp.com/design/designs/kv46-digital-llc-converter-reference-design:LLC-RESONANT-CONVERTE...

So i suppose to start with that and design my device.

Question are:

- half bridge llc converter still best choice? 

- do i need to design also a pfc to power the board? if yes, there is some NXP reference design to do this and some code example? 

- how can i reach 35A output (almost double) ? 

- how can i develop adjustable output voltage (approx from 1 or 2 V)

- output current limiting will be achieved by regulating down output voltage?

I hope i can develop this device with NXP.

Thanks in advice.

Alberto Beghetto

[JozefKozon]

Good morning Alberto,

yes the half bridge is a good choice. Your required power output is 12V*35A=420W. However instead of the mentioned KV46 Digital LLC, I would rather recommend you our LLC & PFC combo controller TEA2016AAT. Please see this link: https://www.nxp.com/products/power-management/ac-dc-solutions/ac-dc-controllers-with-integrated-pfc/...

The TEA2016AAT combination gives an easy to design, highly efficient, and reliable power supply, providing 90 W to 500 W.

Please find attached a design tool excel file for the TEA2016ATT.

We also have a TEA1995T synchronous rectifier, which increases overall effectivity of the system. Please see this link: https://www.nxp.com/part/TEA1995T#/