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WEBENCH® Tools/LM5001: Simulation in Sepic Mode

Russell Wetherley1
Expert 4255 points
Part Number: LM5001

Tool/software: WEBENCH® Design Tools

Hello E2E,

I am seeing an odd response to a design.  See 

Does that 2nd error mean that there is no calculator available for using the LM5001 in Sepic mode?  Or at least in this configuration?  The weird thing is that it works at a load of 200ma.  Is there a part limitation?

Russell

  • 0
    TI__Mastermind 34231 points
    Hi Russell,

    It will hit current limit 800mA(min). Assuming efficiency is 85%, the current flowing though the first inductor will be 24*0.3/(18*Efficiency)= 0.47A. When mosfet is turned on, both of two inductors current will flow through mosfet. The current will be 0.47*2=0.94A>0.8A. That's the reason why webench does't support this application under 0.3A load current.
    What's the load current that you really need? 0.3A?

    Regards,
    Zack