we are using the PFS716EG as controller of a PFC stage providing 350W. We want to be abble to operate on the range 260VAC - 90VAC, but we are having problems on the range 160VAC-90VAC where the PFC is not being abble of work propertly, even it breaks in this condition.
We have used the PFS716EG spreadsheet in order to calculate the inductor we need on our stage, but depending on the type of core, the inductance varies between 150uH and 3mH. Actually, we are using a custom 800uH but it seems is not enough.
Do you know wich is the best core type for our application?
Do you know why our controller is not protecting himself and it breaks?