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PMP7282: 30V - 1000VDC to 12VDC high efficiency (>95%) DC step down converter >= 600W

sug
Prodigy 40 points
Part Number: PMP7282
Other Parts Discussed in Thread: LM5116, , LM5146-Q1, LM5140-Q1

Hi, I found this design:

35V to 60V Input, 600W Output Dual-Phase Buck Converter Design with Greater than 97% Efficiency

http://www.ti.com/tool/PMP7282#technicaldocuments (2012)

What newer products are there that will help achieving high efficiency and power output at 12V with a wide DC input range.

its possible I can nail down an input range but from my understanding the PWM technique should allow a wide range with minimal losses, unless I'm missing something?

  • 0
    TI__Genius 11040 points
    Hello,

    I will follow up with the product expert and provide feedback on what newer products could act as a replacement for LM5116.

    Best Regards,
    Katelyn Wiggenhorn
  • 0 in reply to Katelyn Wiggenhorn
    TI__Genius 11040 points
    Hello,

    One additional question, what is your input voltage range? Are you looking for a device which supports 35-V to 60-V input, or are you looking for a 1000-V input?

    Best Regards,
    Katelyn
  • 0 in reply to Katelyn Wiggenhorn
    Prodigy 40 points

    Hi Katelyn,

    Thanks for following up!

    If there are certain requirements to gain >97%+ efficiency, we can tailor the input to that range, but I'd like to be as adaptable as possible.

    Right now for our project, the input range can vary between 30VDC -1000VDC. In actuality it will be anywhere in that range +/- 10VDC. It comes down to wiring losses which become meaningful based on the distance from the power source to where its being used.

    ex: one system may have an input at 70VDC +/- 10VDC ( 60VDC - 80VDC)

    another system may have 380VDC +/- 10VDC (370VDC - 390VDC)

    Does that make sense?

    The other thing about the PMP7282 design is it puts out a lot of heat! It gets over 100 C at 50A load based on the test data. I was hoping new devices could help get into a more manageable range (~50 C) or if we could parallelize the boards (PMP7282 reaches peak efficiency @ 30 A) to achieve the same while maintaining modularity.

    Kind regards,

    sug

  • 0 in reply to sug
    TI__Guru 66042 points

    Hello,

    One option may be the LM5140-Q1 65V synchronous dual controller that can be configured as a two-phase implementation. The LM5146-Q1 may also be a possibility. Note that the 12V output can feed the VCC of the LM5146-Q1 to reduce IC power consumption. See this blog to configure as a two-phase implementation:

    e2e.ti.com/.../how-to-design-a-simple-two-phase-current-sharing-synchronous-buck-regulator-using-a-voltage-mode-controller

    What is the output current requirement? Maybe an efficient single-phase implementation is feasible. 

    Regards,

    Tim

  • 0 in reply to Timothy Hegarty
    Prodigy 40 points

    Hi Tim,

    Thanks for the link, it was helpful.

    I overlooked the potential phase shift from parallelized DC-DC converters. I figured a system that took multiple DC 12V outputs and then fed into a regulator would suffice but this is a potential for efficiency gains or losses depending on how its handled.

    Each system/unit will require 550W - 600W. [edit: we may be able to optimize each system to ~450W but I'd like to allow for a margin]
    Some devices will use far less, ~150W. They can be handled with conventional products or bundled to reach similar power usage.

    Kind regards,

    sug

  • 0 in reply to sug
    TI__Genius 11040 points
    Hello,

    The E2E threads will lock after 30 days. I am going to close this thread. But if you have any additional questions, please open a new E2E thread.

    Best Regards,
    Katelyn