We are considering using an MP9989 in a PoE PD solution to squeeze every last ounce of power out of the 13W budget. To that end we are putting the MP9989 on the secondary side of the transformer replacing the Schottky diode. This is for a 5V output solution. We have followed the datasheet and reference design but are a bit stumped as to what to choose for the passive components which go alongside the main silicon. The datasheet says that Rsense should be between 100 ohms and 300 ohms but does not specify a specific value, or a function as to how to calculate it. There is no information whatsoever in the datasheet as to what to choose for the capacitor between VDD and VS.
Can anyone shed some light on what we should be choosing for these two passive components?