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UCC28221: Is it possible to project a 380V two-switch forward converter?

Gabriele Pellegrinelli
Prodigy 30 points
Part Number: UCC28221

Tool/software:

Hi all.

I would like to make a three-phase 380V AC-DC isolated converter power supply that provides 24VDC output with a maximum current of 7A.
I thought of designing a forward converter, because it is about 170W of power (a flyback converter would have a low efficiency).
is it possible to design a converter with rectified three-phase input voltage? I found the controller that manages the maximum VIN of 72VDC, but I can't find anything that can work at the voltage I indicated. can you help me?
Thanks.
  • 0
    TI__Guru 73535 points

    Hi,

    AC to DC is through three phase bridge rectifier not related to the DC to DC converter.

    After the bridge rectifier you can design 170W flyback converter just like from any other DC input.

  • 0
    Prodigy 30 points

    Hi all.

    I know I put a three-phase rectifier bridge after the AC line in.
I don't want to use a flyback because the power of the DC-DC converter is high and therefore I would like to use the forward two-switch topology.
An IC that can handle this topology is the UCC28221, but the datasheet indicates a maximum VIN of 72V.
How can I use this component if my VIN is much higher (380V rectified)?
Do I need to use an auxiliary winding of the transformer for the integrated power supply at an acceptable voltage?

  • 0 in reply to Gabriele Pellegrinelli
    TI__Guru 73535 points

    Hi,

    How do you use UCC28221 for two switch forward? Note its two drive outputs are interleaved. I am not clear how you use this device to make two switch forward. Its direct application is single ended but interleaved. Unless you can provide your circuit to show how you want to use it in two switching forward, I am not clear if it can be.

    When input voltage is > 76V recommended, you can open VIN pin, and provide a bias to VDD from external supply with 8.4V to 14.5V. So this way can help to use the IC when Vin is outside the recommended range.