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TPS560430: Webench design cannot be created for Vout=1V

Ue
Genius 17175 points
Part Number: TPS560430
Other Parts Discussed in Thread: LMR50410

Hi all

My customer is pointing to a bug in Webench, namely that the design cannot be created for Vout=1V.

Please comment.

Best regards

Ueli

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  • 0
    TI__Genius 10720 points

    Hi Ueli,

    It looks like the selected input voltage range violated the minimum on time spec of the device (60ns). 

    LMR50410 would be a better option because its switching frequency is lower (700kHz) which means that it won't violate this spec at the desired operating conditions. Please have the customer give this device a try in Webench.

    Regards,

    Harrison Overturf 

  • 0 in reply to Harrison Overturf
    TI__Genius 17175 points

    Harrison

    Thank you for the quick reply and understood ... my oversight.

    With 2.1MHz switching frequency T= 0.476us and the duty cycle with Vin=16V and Vout=1V is 1/16 (ideal case, no losses), meaning ton=62.5us, this is too close to the typical value of 60ns.

    I will recommend to use the LMR50410.

    Best regards

    Ueli

  • 0 in reply to Ue
    TI__Genius 10720 points

    Hi Ueli,

    Your assessment is correct. If you or the customer have any questions regarding the LMR50410 post and new thread and we can go from there. I will close this thread out.

    Regards,

    Harrison Overturf