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LM5118: Unusual switiching

Mahesh Potdar
Prodigy 80 points
Part Number: LM5118

Tool/software:

When I am operating my converter in Buck-Boost motde at voltage below 9.75V boost MOSFET switching is not correct. It is not continuous, It switches then open for some time and again start switching. Input 8.1-15V and Ouptut 12V. Output current-5A. Above 9.75V switching is happening correctly. 

  • 0
    TI__Guru 58681 points

    HI Mahesh,

    in the case of low input voltage and not correct switching do you still see the right output voltage?

    Can you provide scope plots:

    - Vin , Vout

    -HS (SW) , COMP, SS

    Showing a few clock cycles and also a few milli seconds.

    Can you also share the schematic.

    Best regards,

     Stefan