How to decide inductor value as in Equation 7 there are two unknown variable Lout and ILrms?
Hi Arvind,
The Table 5 is just for reference. If Vout is 5V you can refer to the 5.5V.
For more different condition, the inductor selection is decided by the limitation as follows:
a. Inductor current ripple: If current ripple is too large, the output voltage ripple will be too large.
b. Loop stability: If current ripple is too small, the loop may be not stable.
c. Ensure the peak current under the current limit condition.
So usually we choose inductance to let the inductor current ripple equal to N=20%-40% of max loading current. The inductance value can be derived as equation:
You can also use our simulation tool POWERSTAGE or WEBENCH to select the inductor.
https://www.ti.com/tool/POWERSTAGE-DESIGNER?keyMatch=POWER%20STAGE
Regarding the Iout, you can also use 8A for your calculation since the over current value is 8A.
