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Thread: Half-Bridge Galvanically-Isolated in Low Voltage, Low Power Application?

  1. Oct 20th, 2020 02:47 AM #1
    boom
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    Half-Bridge Galvanically-Isolated in Low Voltage, Low Power Application?

    Can a half-bridge configuration, such as the following, be an efficient solution for the following requirement?

    Requirement:
    - Galvanic isolation between input and output
    - Input: 12-24V DC
    - Output: 5V DC @ 2A

    What about SR losses? According to Infineon's chart, below, SR losses would exceed diode losses at our desired output. Is there a way to mitigate that, or an alternate topology?

    From Infineon Video
    https://youtu.be/LyhsaTeN-oQ?t=198

    Click image for larger version Name: half-bridge.jpg Views: 2 Size: 159.7 KB ID: 5210

    Click image for larger version Name: SI-losses.jpg Views: 0 Size: 64.1 KB ID: 5211
    Last edited by boom; Oct 22nd, 2020 at 08:15 AM.
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  2. Jan 5th, 2021 12:44 AM #2
    Abhilash P
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    Hi,

    As per the required power specification, a Flyback topology is well preferred. It has less component count compared to half bridge and it is easy to control.

    Please find the attached image with different DC-DC topologies, their specifications and its applications.

    Click image for larger version Name: 1.PNG Views: 2 Size: 530.2 KB ID: 5368

    Please revert back if you need any help in selecting the right switch and the package.

    Regards,
    Abhilash P
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.
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