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PMP20612: Altering PMP20612 for my purposes

Steve Crow
Prodigy 10 points
Part Number: PMP20612

I build high-end tube guitar amps in one of which, currently I use a combination of three Mean Well power supplies to get 450V @ 500mA, 6.3V at around 2.5A and a 12V in the order of around 250mA. I am looking to move on from that because various aspects are non-ideal.

The PMP20612 schematic looks like it might be flexible enough, but I just do not have the knowledge or expertise to do this.

If someone could kick me in the right direction I'd be delighted.

I am thinking of getting a couple of pcbs fabricated (from the gerbers on the PMP20612 dev page) but need a wiser person than me to explain why that board will not work, if indeed it will not!

Many thanks in advance.

Steve Crow

  • 0
    TI__Expert 6620 points

    Hi Steve,

    I think this design could be used, the power level is close to right, but the transformer needs to be modified.

    The turns ratio needs to be tuned for a higher output voltage, the rectifiers on the secondary will also need to be modified.

    A good place to start would be with Power Stage Designer to help get the right component values.

    The last thing to look at would be the control loop, you can remove the current regulation loop and just regulate the output voltage.

    Hopefully this helps!

    Thanks,

    Robert