UCC256402: LLC with two output voltages?

Steve Golik

Part Number: UCC256402

Can the LLC topology be used if you need two power supply rails?

I need 12V @ 5A and 52V @ 2A. I would like to generate these off the same (single) transformer.

Is the LLC topology suitable for this?

All the app notes and LLC articles I have read only have a single output voltage.

I plan to use diodes for the 52V supply, perhaps in a bridge configuration, so only a single winding (not center tapped) is needed.

The 12V supply will be center-tapped and use SR's.

Any recommendations on how to do the feedback loop?

+1 Manikanta Pallantla over 1 year ago

Hi Steve,

You can definitely use LLC in this application.

Please refer following reference design which implements multiple outputs with a single LLC transformer.

This design uses older LLC controller (Ucc25630x). But please use UCC256402 instead of the older generation controller.

Also, for controlling multi outputs, you can refer the following reference.

Please let me know if you have further questions.

Regards

Manikanta P

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