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PMP6712: Questions about the PMP6712 reference case

zoujiangyilang
Genius 4560 points
Part Number: PMP6712

Hello.

I want to refer to your PMP6712 case to design a 48V input, 50V / 20A / 1000W single DCDC power supply.

I initially learned the schematic diagram of PMP6712.

I have some questions to ask.

1. Is this reference case working simultaneously? Does each channel output 800W of power?

2. I only need to do a single-channel 1000W case. For the first and second sheets in the schematic, can I refer to one?

3. The first and second sheets of the schematic diagram should be the main power, controller, and driver parts. I don't understand what is the function of the SUNB circuit composed of 6 diodes?

4. I only do the single-channel DCDC main function, the third schematic, do I only need to refer to the bias power supply and op amp feedback section? No over-voltage protection and active buck snubber circuit are required. I don't know what is the function of this active buck snubber circuit?

Thank you.

  • 0
    TI__Intellectual 2770 points

    Hello Dir,

    PMP6712 is a dual phase interleaved fullbridge in M/S configuration,
    so the full output power 1500W is shared in between the two power stages.

    The single design is designed for 750W; for 1kW it needs to be recalculated and checked.

    The six diodes are conducting the energy of the overshoot at the synchronous rectifiers
    to an active snubber circuitry.
    Any snubber circuitry, RC, RCD or active, prevents from violating Vmax at the rectifier,
    here prevents from violating Vds of synchronous rectifier.

    The auxiliary supply is needed to supply the gate drivers on primary and secondary side.

    The error amplifier on secondary generates the error voltage passing the isolation barrier
    from secondary to primary to close the loop at EA- of master controller pg1.

    Best regards, Bernd

  • 0 in reply to Bernd Geck
    Genius 4560 points

    Thank you,Bernd.