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WEBENCH® Tools/LM3488Q-Q1: LM3488Q-Q1

Edoardo Lotti
Prodigy 170 points
Part Number: LM3488Q-Q1

Tool/software: WEBENCH® Design Tools

Good morning, in the past I designed a Sepic DC/DC converter in order to manage a VIn in the range 8V-32V and a fixed Vout of 12V.  Using Workbench I generated the proper schematic based on LM3488-Q1 device.  After the board has been assembled I discovered that this logic was not working fine in the range 8V-13V; that means the logic works as StepDown , but not as StepUp.
I tried to reverify the schematic and discovered that now the circuit is different.
Can you help me in the understanding of the issue?
I can send you the first schematic I generated and implemented and the newone I regenerated today but also 1-2 weeks ago. I would like to know if there is a way to modify the initial schematic to have the StepUp working too.  Eventually  would like to know which is the correct schematic. 
This is the new schematic from WorkBench.

Thanks a lot for your support.

  • 0
    TI__Guru* 78060 points
    I am afraid you may have a wrong connection or used a wrong part somehow when you built your first board. If you designed PCB with a software, could you please share the PCB native schematic so we can have a review?
  • 0 in reply to Youhao Xi
    Prodigy 170 points

    Yes, I will share, but at moment what can I do to have this logic working properly?  Is there a solution based on connection we have?

    What do you suggest in terms of device able to manage Vin 8V-32V, Vout 12V and 2A?

    Thanks a lot.

    Best regards Edoardo.