LM5155: tr, tf

Hi Kuramochi,

Thanks for reaching out with your question and for considering the LM5115 in your design.

The rise and fall time are just calculated based on the drive current and the gate charges of the selected MOSFET and the gate driver strength. It follows this application note

https://www.ti.com/lit/ml/slua618a/slua618a.pdf

Thanks

Garrett

Kuramochi,

The calculator uses the gate charges of the MOSFET as these a common values in the datasheet and the gate drive voltage of the MOSFET is know. VDS is know by the calculator as the efficiency is calculated for one input voltage.

Yes, I SUPPLY should b used for ID should be the input supply current.

Please let me know if you have any questions.

Thanks,

Garrett  

Hello Kuramochi,

You can find them at the lower end of the Excel sheet next to the efficiency and losses curves.