Hi,
I tested this board for ~200mA load with a 22uH inductor. It worked fine. My question is how to improve the current/voltage ripples for low load conditions. I went through the step by step calculations. it seems that the inductor has to be very large to achieve the low ripple current, using the equation 15 on page 22 of the data sheet. Is this right?
My limitation is the inductor has to be less than 22uH.
So what else I need to change to improve the performs and stability.
My second question is if I have two of this switchers on the board (one for 5V and one for 3.3V). Is it true to synchronize the switching of the two is better?
Thanks,
F.Z.