• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 819 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM5160: inverting buck-boost (RON operation)

Ryuji
Guru 20090 points
Part Number: LM5160

Hello,

Can we use LM5160 for inverting buckboost operation?
RON pin of LM5160 is connected to the VIN.

In the case of the inverting buck-boost configuration, I think that the VIN with reference to the AGND of the LM5160 will varied at the startup.
Is this a problem with using the LM 5160 in an inverting buck-boost circuit?
Does Fsw change only?

If there is any test result (or any TI design) of LM5160 for inverting buckboost operation, could you please share the data with me?


Best Regards,
Ryuji

  • 0
    TI__Genius 11085 points

    I think you can use LM5160 for inverting buck boost application.

    The supply input to the board will refer to the board ground. Once the part is started, the IC will see VIN+|Vout| voltage between VIN and GND pins. Please make sure VIN+|Vout| will not exceed the defined Vin range of the IC. I'd recommend select your components as if supply= VIN+|Vout| and output = |Vout| in a buck topology.

    I am not aware a test report for inverting application with LM5160 as this point. I will check with other colleagues. You can config a standard EVM to an inverting buck boost to try it out.

    Please refer to this document for board configuration: http://www.ti.com/lit/an/snva722b/snva722b.pdf

    Regards,

    -Yang

  • 0
    TI__Expert 4100 points

    Hello Ryuji,

    Short search on the website revealed that there is reference design with LM5160 in fly-buck boost configuration.

    Here is link to reference design and associated documents

    Best regards

    Brani

  • 0 in reply to Brani Dubocanin
    Guru 20090 points
    Hello Yang san, Brani san,

    Thank you for the information.

    Best Regards,
    Ryuji