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Controller/Converter needed for High Current Application

Scott Gauche
Prodigy 20 points
Other Parts Discussed in Thread: LM5118
Hello,
Has anyone designed a high current application around the LM5118? Specs for my design are 6-32V input, 28V output, 15A max continous current, 50A 1 second peak load. Is it possible to meet these specs using this controller? Is there a better solution from TI/National for this type of application?
Thanks,
Scott
Edit: After looking at the LM5118 further, I don't think that it is going to meet these specs.  Are there any other converters/controllers out there that would handle this?
  • 0
    TI__Intellectual 940 points

    Scott,

    I don't think the LM5118 is appropriate for an application with this much input current (over 230 amps at 6V input).  This is a tough specification given the low iput voltage, but I think a full wave topology would be the only way to go.  Either a push-pull or a full bridge could handle the power better, but you would need a transformer which complicates the circuit.  In my opinion though , that is the way to go. 

    Regards,

    Ron Crews

  • 0 in reply to Ronald Crews
    Prodigy 10 points

    Hi Ron,

    I had a question regarding flexible voltage and amperage with a very similar conceptual design. I am using kenthal wire to create a resistance for a heating element. I am assuming I will be using a resistance of 2 to 3 ohms in order to achieve the highest wattage output possible with a battery with a continuous discharge rate of 240amps. The possible output I  believe came to be near 800 watts and I am looking for a micro controller that will handle this load and if not how can I improve anything to make it do so.

    Thanks,

    Zack