LTC7871 buck-boost converter design problem and high voltage high power DC-DC boost converter design help

Hi. First of all, I am an undergraduate 3rd-year student who takes Electrical Power Engineering and I had given a task from my supervisor to design a DC-DC converter to step up 72V DC to 96V DC with a constant output current of 50A which is so complex and difficult with my current knowledge. Anyway, I tried to research all regulators in Linear Technology and I discovered that only LTC7871 that responds to my search with those parameters but I still confuse about how to modify the schematic diagram of the LTC7871 to satisfy the demand voltage and current output. The regulators also didn't have a simulation Spice model in LTSpice which I always use to design DC-DC converter before. Thus, I really need help on how to use the LTC7871 to produce 96V output voltage and 50A output current which results in around 5000W power output. If there are other alternative regulators that can be used, it will be really helpful in designing the power converter and I hope that I can get perfect resources to study in designing this power converter too.

Best regards,

Zhafran Aiman Zulkarnain

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  • +1
    •  Analog Employees 
    on Jul 28, 2020 5:16 AM 6 months ago

    Hi Zhafran,

    5KW is not an easy task and requires significant power design experience and most probably time. If you just want to study a boost converter or demonstrate its function, you don't need to build a high power, expensive and bulky design not to mention risky (96V is high voltage.)

    This product is new so I don't see available demo board yet. You may want to check LT8551. Though not capable of 96V, it has an available demo board that is a good reference design.

    In many cases, the datasheet contains enough information to design the converter with someone having good power engineering background. 

  • Thank you very much sir for your feedback and I will take consideration for that. However, my supervisor still insists on producing 5kW power output which basically will supply power for the electric car. That's why he needs a huge power output in order to make the EV car lasts longer on the road. Because of that I will try to test out LTC7871 if my supervisor demands.

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  • Thank you very much sir for your feedback and I will take consideration for that. However, my supervisor still insists on producing 5kW power output which basically will supply power for the electric car. That's why he needs a huge power output in order to make the EV car lasts longer on the road. Because of that I will try to test out LTC7871 if my supervisor demands.

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