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  1. #1
    Beginner Beginner coldrunning2002 is on a distinguished road
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    200 Volt to 160 Volt buck smps.

    Hello,

    I have a circuit to convert 200 Volts to a regulated 160 Volts at 35 Amps, the cuircuit works ok.
    I want to convert the circuit so it uses a N-MOSFET instead of a P-MOSFET and improve the switching efficiency and reduce the number of components.

    What part do i choose?

    Gary

  2. #2
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    Srivatsa is on a distinguished road
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    Hi Gary,

    Pls look at XMC1000 or XMC4000 series of microcontrollers (www.infineon.com/xmc) for the control stage. IRS20752 / IR2125 gate drive for high side buck along with the right OptiMOS N-MOSFET (https://www.infineon.com/optimos).

    You can look at 2ED2181 gate driver with above XMC controller and OptiMOS if you want to further improve the efficiency and use a synchronous buck. Some design guidelines are as shown below:

    Buck Converter Design app note at https://www.mouser.de/pdfdocs/BuckCo...DesignNote.pdf
    Synchronous buck explorer kit at https://www.infineon.com/dgdl/Infine...559b9168515eec

    You can also contact local sales and FAE team in your region to further assist you with the right component selection for your design.

    Thanks and regards,

    Srivatsa
    More information can be found under www.infineon.com/gatedriver
    Please contact our Technical Assistance Center for further inquiries

  3. #3
    Beginner Beginner coldrunning2002 is on a distinguished road
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    Thank you Srivatsa,
    I will look at the synchronous driver solution, do I need to add an extra power Schottky diode in series with the power inductor?
    This PSU has output current transient and sometimes no load.
    I think bootstrapping method without extra diode there must always be stable load current, otherwise electrolytic could dead short through the synchronous switch?
    Also without extra diode, the output electrolytic must also be discharged to startup?

    The challenge is to do this negative rail version as well, how do I do this?.

    Gary

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