Hi to all, I was taking a look to LM2841 datasheet where is reported example schematic:
- Vin = 4,5 to 42 Volt
- Vout = 3,3 Volt
- Iout = 0,1 Amp
In this case 10uH inductor has been used.
About determining inductance: "the maximum input voltage is always used to determine the
inductance"
Assuming we are using Y option, nominal Fsw is 1,25MHz, while for X option is 550kHz: in first case nominal inductor value is 23 to 81uH (minimum voltage, maximum voltage), in last case is 53 to 184uH.
So, why so different from 10uH in example?