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LMR14020: inverting buck design by synchronous buck convert

Zhihong Huang
Intellectual 1550 points
Part Number: LMR14020

Hi team

    Can I use the synchronous buck converter to do the inverting buck design like the design I do in the picture? if not, could you please explain why?

  • 0
    TI__Expert 4555 points

    Hi Zhihong,

    I am sharing TI app notes with you, which will greatly help you to understand the designing of Inverting Buck Boost through any ordinary buck converter.

    http://www.ti.com/lit/an/snva856/snva856.pdf

    http://www.ti.com/lit/an/slva478b/slva478b.pdf

    Best Regards,

    Ankit Gupta

    Application Engineer

  • 0 in reply to Ankit Gupta95
    TI__Intellectual 1550 points

    Hi Ankit

         The document you shared mentioned that "Finally, the "new" input capacitor from VIN to system ground helps to provide a low impedance path at the"(snva856.pdf P10).However,  I still don't understand why there is a the "new" input capacitor in IBB. Could you explain more specifically the reason why the"new" input capacitor exists , or what damage could happen without this the "new" input capacitor ?


    Best Regards,

    Wesley Huang

     

    Field Application Engineer,China

    Texas Instruments Semiconductor Technologies (Shanghai) Co., Ltd, Guangzhou Branch

    Cell : +86-189-2449-8998

  • 0 in reply to Zhihong Huang
    TI__Expert 4555 points

    Hi Wesley,

    This new input cap exists to take care of all high-voltage ripple caused by PCB resistance and inductances that disrupts the electronic devices, whereas Cio will help with load transients by providing a path from input to output for the load current transient.

    Please close the thread if you think my response answered your question.

    Best Regards,

    Ankit Gupta

    Application Engineer