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LM5180: How to use DC-stack to implement +15V and -5V output

Steve Hsiao1
Prodigy 85 points
Part Number: LM5180

Dear TIer,

after reading the article (How to raise regulation performance with a stacked-output PSR flyback DC/DC converter

) from Mr.  , I have successfully implemented better regulation performance of VISO = 24 and 5V at LM5180 as shown below.

My question is "Is it possible to use DC-stack topology to implement positive VISO and negative VISO such as VISO = 24 and -5V at LM5180? "

 

Best Regards,

Steve

 

 

  • 0
    TI__Guru 73292 points

    Hi Steve,

    Thanks for reading my article on stacked flyback outputs.

    The easiest way to implement +24V and -5V outputs is with a common ground. See the application example in the LM5180 datasheet for +15V/-8V dual outputs. This corresponds with the LM5180 dual-output EVM, which is orderable on our website.

    Regards,

    Tim

  • 0 in reply to Timothy Hegarty
    Prodigy 85 points

    Hi Tim,

    Thanks for your quick reply.

    Yes, I've had LM5180 dual-output EVM in the LAB.

    Meanwhile, I've done +24V and -5V  successfully with "conventional dual output" by a hand-made transformer on LM5180 EVM.

    For next step, I am wondering to use "DC-stack dual output" to get the better regulation performance for +24V and -5V.

    But, I don't know how to handle common ground to get the negative output, -5V.

    So, Is it possible  to use "DC-stack dual output" to get +24V and -5V.?

    Your short reply will be highly appreciated.

    Best Regards,
    Steve

  • 0 in reply to Steve Hsiao1
    TI__Guru 73292 points

    Hi Steve,

    I think the conventional shared ground is the easiest way to do it - not sure if it's really possible to do a DC stacking. Note that the Excel quickstart file is available in the product folder to expedite design for a dual-output.

    Regards,

    Tim

  • 0 in reply to Timothy Hegarty
    Prodigy 85 points

    Hi Tim,

    Noted and thank you. I'd follow conventional shared GND for my next step.

    BTW, LM5180 quickstart is a very good tool which helps me a lot. Come back you if any. 

    Best Regards,

    Steve

  • 0 in reply to Steve Hsiao1
    TI__Guru 73292 points

    Perfect, thanks Steve.

    Regards,

    Tim