Hi, We have an issue on a product which is using MP9486A to generate 5VDC: The output is oscillating at a period of 50ms approx when the input voltage is between UVLO (4V approx) and 5V (The voltage set on the output). Is there any way to prevent these oscillations? [NewFile25] We would like to…

So you are trying to generate 5V from 5V the chip has some maximum duty cycle that will prevent this. Maybe what your are seeing is that BST cap is being discharged and so the Fet is being turned off. After a while the BST cap is recharged and it tries again. You may need to consider a 4 switch…

victor.gaillot July 30, 2021, 1:35pm 2

On the graph, CH2 is the output of the MP9486A and CH3 is the input.

And here is the schematic:

MP9486A's output oscillating when Vin is just above Uvlo