Hi,
This is a rather general / basic question, but since I am considering using TPS54335A specifically, I wanted to ask it here.
In the guidelines of many buck regulators there is the calculation of minium switch coil inductance. That is the case also for TPS54335A. It scales with switching frequency and output current. Now in my specific case I am really limited on space, so I would like to use an as small coil as possible. At the same time as I will have quite varying load conditions. In certain cases I will draw 500-800 mA, while normally the load will be closer to 1-10 mA.
Calculating the minimum inductance based on 10mA load instead of 1A load suggests an inductance that is much higher. How should the guideline be interpreted, is it suggesting that I go with the higher inductance calculated from my smallest loads, or the lower from my maximum load?
If I go with the lower inductance (based on the higher output current), will I get into issues? I was thinking that perhaps the minimum inductance requirement would be based on the highest load, ensuring that the inductance is at least high enough to ensure I am fast enough to ramp to that level of current (dI/dt = V/L).
Thanks!
