based on my experience with the MP5073 load switch, which has a soft start pin, for high capacitances a manual discharge of the capacitor is needed, otherwise it would skip a large portion of the ramp up.
I was trying to use the MP2328/38 to implement this feature directly into the switching converter. I have not tested it yet and current availability suggest it will not happen too soon.
I need a fairly large soft start time (around 2 seconds) and so I put a 33uF capacitor on the soft start pin in my design. I think that it will not be automatically discharged on power down (it would take probably 30 minutes or more to discharge through the IC), so are there any simple circuits I can use to discharge the capacitor when the output voltage is 0 (regardless of the reason)?
Currently I have a transistor and mosfet (like in the photo), but physical constraints of the design don’t allow me to place this configuration. Any ideas?
(Don’t mind model numbers and power sources too much, this is a snapshot from LTSpice in which I needed something to test. Just look at the actual configuration of the transistor and mosfet)