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PMP20637: Bi-directional DC-DC converter

Part Number: PMP20637

Hello,

  • PMP-20637
  1. This is a 390V to 48V DC-DC to converter. Correct?
  2. Is it b-directional?
  3. If the Input voltage has no ripple what is the expected ripple in the output
  4. We found test file (attached). We do not seem to be able to find the design file. Can you pls send that design file.
  5. Resonant frequency is 950 KHz. What is the switching frequency?
  6. Can this design work at 600VDC to 48VDC?

Regards,

Sam

  • Hello Sam,

    1) correct, a 1kW resonant LLC half bridge, powered out of 390V PFC voltage to isolated 48V @ 21Amps,
        please read description
    2) it's a UNI directional power supply, just see description
    3) the output ripple voltage is less than 400mVpp sinusoidal, just see test report pg 28/29
    4) just download ALTIUM design files and GERBER data at the bottom of PMP20637 home page
    5) switching frequency is around 950kHz using low Qrr GaN devices, just see description
    6) for 600V input primary side needs to be changed (input caps, FETs, windings ratio, etc.)

    Best regards, Bernd

  • Hi Bernd

    Thanks for your response

    3) we are not seeking  gerber files and pcb files....we are a seeking a design file that describes the concept of the design.....usually TI reference designs have such a pdf that describes the fundamentals of the design rather than just test results. Do you know where we can find it?

    Regards

    Sam

  • Hello Sam,

    I checked our Power Supply Design Seminars data base, we got no white paper on this converter.

    But if you select for GaN or LLC you will find some material there that is close:

    www.ti.com/.../login.shtml SUPPLY DESIGN SEMINAR

    Best regards, Bernd

  • Thanks Bernd for the references....

    I am surprised that there is reference design pdf.

    Further, your answer (5) above does not seem correct to me...I do not believe you can switch at the resonance frequency.

    Regards

    Sam

  • Hi Bernd,

    We need contact details of a TI Person/Team that can adjust some reference designs for us. We understand that we need to pay for this service. Can you pls send us such contact details.

    Regards,

    Sam

  • Hello Sam,

    if you have a look at gain curve we're switching ABOVE resonance frequency;
    at or below the converter will be damaged, so there is a Fmin/Fmax limit.
    If you don't trust me just check test report, please see drain pulses 390Vin/21Aout,
    check time base of scope 200ns, period is 200ns x 5.25 divisions, roughly 1.05us,
    would say around 950kHz...

    And if you still don't trust me - look at the bottom of the screenshot, freq Ch4 says 949.777kHz;
    just have a brief look into our documentations.

    Indeed, we're building custom reference designs; to get your design built by TI please get in
    contact w/ your local TI FAE. He's the right person to enter your request.

    Best regards, Bernd

  • Hi Bernd

    What FAE means? We tried searching for that....can you pls send us a weblink for that TI FAE?

    Regards

    Sam

  • Hi Bernd

    Are all resonant converters Unidirectional?

    Regards

    Sam

  • Hello Sam,

    no, resonant topologies could be bidirectional, too;
    in our actual Power Supply Design Seminar you will find a 6.6kW bidirectional CLLLC dual bridge converter;

    FAE means field applications engineer; so just contact TI field or sales person that is assigned to your account.

    Best regards, Bernd