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Inorder to provide the galvanic isolation for circuit

Other Parts Discussed in Thread: LMR24210, TPS55010, LM3150, LM5017

Sir,

     I have found LMR 24210 regulator having input 28V and outputs are  3.3V-0.8A,  15V-0.1A,   5V-0.4A  can  we provide galvanic isolation of the output voltages between each other and from primary circuit

  • Galvanic isolation is provided with a transformer.  The LMR24210 cannot be used in any standard topology using a transformer. 

    Please send more details on what you are trying to achieve so that I can make a recommendation.

    Regards,

    Marc

     

     

  • sir,

    i am designing power supply board with 28V input to  these output voltages  (3.3V(I)-4A,3.3V(II)-1A, 15v-1A,5v-0.4A, -5v-0.1A, 2.5v-2A) in a single board. i finalised six ICs corresponding to above voltages LM 2679-3.3, LM2675-3.3, LM2679-adj, LM 2675-5.0, LM 5574 MT, LM 3150-2.5.

    Now i want to provide galvanic isolation  among these voltage converters, so i connected transformer after LC filter.

    (below i attached my simulated diagram)

    my doubts are

    1.if i connect transformer after inductor,  is it  providing galvanic isolation among voltage converters?

    2.if it is not provided , how can i provide galvanic isolation among these  voltage converters?


    3.if above ICs does  not support, can u provide ICs which support galvanic isolation?(i mentioned my voltages & current ratings above)

    2146.Raj1.TSC

  • Sir,

          i am requesting you to respond to my mail as soon as possible.

  • Hi Swetha,

    This is a pretty involved design. Give us some time to get back to you.

    Thanks,

    Anston

  • Sir,

          Its already so late that you didnt reply me to my mail.Is it possible to design

  • I apologize for the delay, I thought a colleague of mine was going to respond.

    You can change a buck converter into an isolated flybuck design if the original part allows negative inductor current.  That means that the part does not have diode emulation and is not a non-synchronous device.

    From your original device list only the LM3150 meets this requirement.  Other parts in our portfolio that can become flybucks include LM5017, and TPS55010.  You will need buck converters that have a low side fet and that do not go into discontinuous conduction mode.

    Here is a link on how to create a flybuck design.

    http://www.ti.com/tool/flybuck-designer

     

    Regards,

    Marc