I have one app to buck+PD, MPS4575 L calculate L = (1-Vout/Vin) *Vout / (fsw * Il)
Vin: 24~ 50V
Vout : 5~20V
I know Vin use Vin,max，but What value to bring into Vout，min or max
Hello, welcome to the MPS Technical Forum.
Please use Vout max and Vin max as this gives the worst case condition value for the inductor.