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800W boost from 45-75V

Jamie Rothwell
Prodigy 20 points
Other Parts Discussed in Thread: LM5122

Hi , Is there a high powered IC that would allow an input of 45-75 volts and produce an output of 100 volts? I need to design a DC DC step up converter that will handle 800 watts and produce the output current of 8 amps

  • 0
    TI__Expert 5900 points

    Hi,

    You could try push-pull topology with LM5037.

    Regards

  • 0 in reply to Kening Gao
    Guru 55913 points

    I tried & failed numerous times to get Wbench circuit design calculator to render any DC/DC converter solution in lessor output voltage of 85 VDC 6 amps peak load.

    Using several DC input ranging from 36-70 volts, I was quickly forced to reduce the DC load 6 down to 2 amps in order to effectively start the Wbench engine calculations. The solution often ending in failure reasons results "Unable to match a snubber diode."  More often listed error "Switch current to high."

    Setting load current below 1 amp finally rendered results however the LM5122 DC/DC shows a 20 amps load current.

    Presumably 1 amp is linked to the lowest of all IC switchers (sink current) returned in the search instead of the expected load current constraint user set to 6 amps well within the 20 amps reported in designer.