I am a bit confused about the inductor selection in section 8.2.3.2.2 of the LM5166 datasheet. Following the example and the math, Equation 28 gives me an inductance of 5.75uH. However, the example states that the equation results in a 4.7uH inductor. If I put the selected 4.7uH inductor into the equation in section 7.3.2.1, I get a switching frequency of about 800KHz, which is more than the part can handle. What am I missing about the 4.7uH selection?
I do see the distinction that Ipk(pfm) is the current limit plus an inductor current overshoot, but I don't see any provided method to calculate that overshoot.
Similarly, this example has a nominal Vin of 24V, but a max Vin of 36V. Even if I assume that the 4.7uH does work out to 600KHz in the example above, this was calculated at 24V, and a Vin of 36V would put the frequency above 600KHz. What happens in this case?
I am also unclear on what to do with Lf(min), from equation 29. Is the point to use the higher value between equation 28 and equation 29? Or will the LM5166 remain in regulation if I use Lf(min), even if it is below Lf?
