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TPS54061 won't create a design

JohnTucker
Guru**** 191445 points
Other Parts Discussed in Thread: TPS54061

I tried to create a design in WB Vin = 6 to 50 V, Vout = 5 V, Iout = 200mA.  WB will not create a design as it calculates Iou/Isw = 2.6744 A which is above the current limit.  It is probably picking too small an inductor value and / or too low switching frequency causing too high peak ripple current.  I am trying to check a customer compensation network issue and they need urgent support.  Can this be fixed quickly?

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    TI__Mastermind 21795 points

    Hi John,

    Yes, the ripple is about 30-35% and exceeds the current limit for your case. The peak current is 0.2677A and is failing the min requirement of 0.25A from the datasheet. Can you try using advanced options and override the inductor ripple percentage and then click recalculate button? I have a snapshot of it below. Try 10% ripple and you should be able to get in to the TPS54061 design and then edit the components as per your requirements. Please note that we are working on this device to improve the compensation network design currently but you should be able to analyse and design your network using the "Re-Comp" tab in the design. Please let me know if this helps.

    Regards,

    Amod