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    Buck Converter for 96V to 60V

    Hi,

    I need to design a buck converter where

    vOUT=60V
    vIN=96V

    ILOAD is what is required to drive a comparator IC whose inputs are
    a reference voltage 96V and buck converter output (both
    suitably reduced)


    How do I choose the components for the Buck Convertor circuit?
    Any help is appreciated

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    Re: Buck Converter for 96V to 60V

    The inductor needs to be rated to carry higher current than your load. That is, the saturation parameter. The amount might be from 110% to 200%, depending on the peak level of your Ampere waveform.

    Usually some frequency and duty cycle can be found so that you get desired output from the inductor. This assumes it can carry sufficient current for your load.

    20 kHz is a reasonable frequency. It is above the range of human hearing. It does not need unusually fast components.



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  3. #3
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    Re: Buck Converter for 96V to 60V

    Hi,

    Why not use the interactive selection guides of the buck converter IC manufacturers?
    Like this: https://www.analog.com/en/products/p...egulators.html

    Other manufacturers have similar online tools.

    Klaus
    Please don´t contact me via PM, because there is no time to respond to them. No friend requests. Thank you.



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    Re: Buck Converter for 96V to 60V

    I have given you here an ltspice sim of a buck converter for 20w, 96 to 60v. I made it in dcm so you dont need slope compensation.
    It could help you get your head around it.
    Ltspice is free from linear.com
    Convert it to .asc type and run

    If you tell the power level i can refine it for you.



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    Re: Buck Converter for 96V to 60V

    KlausSt
    I checked the website and entered the parameters required and got only one result it was the LTC3639. After seeing the datasheet it might work for the buck converter I am trying to make
    Last edited by tej7499; 3rd November 2018 at 17:01.



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  6. #6
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    Re: Buck Converter for 96V to 60V

    Hi,

    This is nonsense.

    Which parameters exactly did you input?
    I get several devices. And there are additionally "non micropower" buck converters.

    --> do a little research on your own. At the AD web site and other manufacturers, like recommended.

    LTC3639:
    I assume you did not read the datasheet.

    Fist page FEATURES list:
    " Wide Output Range: 0.8V to VIN"

    sections
    "Output Voltage Programming"
    "40V to 150V Input to 36V/100mA Output with 25mA Input Current Limit"

    Klaus
    Please don´t contact me via PM, because there is no time to respond to them. No friend requests. Thank you.



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