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PMP21582: single stage LLC-SR

Giancarlo Pellizzari
Prodigy 20 points
Part Number: PMP21582
Other Parts Discussed in Thread: PMP22087, UCC256404

Dear TI experts,

I'm thinking to use a single LLC stage as done on PMP21582 recalculating the resonant tank for the EU input voltage range (190Vac-265VAC at 36Vout).

I've got a steady state requirment of 200W with peak handling capability of 360W. I'd like to manage the feedback by a CV/CC controller to cover high current pulse required by a DC motor.

Is there any reference design that are closer to what I'm looking for?

Other than this, do you think is it feasible to avoid the use of a pre-stage (PFC), for example using a LC input filter with low frequency to get harmonics limits within EN61000-3-2 class A?

last but not least, seen the high current requirment at the output I would use a sync rectifier, just to avoid heat sinks on diodes.

Any suggestion on how to manage the transformer? Any change to maintain double outputs rearranging the stacked windings?    

Thank you for your support!

Gian 

  • 0
    TI__Intellectual 1380 points

    Hi Gian,

    I think PMP22087 would be a closer design to you requirements. https://www.ti.com/tool/PMP22087. The schematic does shows an OCP implementation option, although the current sense resistor was kept to 0 Ohm for testing.

    For harmonic limits I do not think it would be feasible to pass without the use of a PFC circuit. PMP22087 shows an appropriately sized PFC.

    PMP22087 uses UCC24612-2 to achieve synchronous rectification on the secondary

    For the transformer, you may have to change the turns ratio to match the new output voltage and resonate at the frequency you want to operate at. I strongly suggest using the SIMPLIS model on the UCC256404 device page for help.

    Thanks,

    John