cc bec question

[slimthelineman]

My question is what happens when input voltage approaches output voltage? Never done it this way but thinking of using it in my dx3s to keep the voltage below 6v (max rating for backlight el driver) and protect the radio when fully charged at 7.2v but wondering if I set it for like 5.5v when the pack starts to dump will the voltage output drop as well to trigger the low voltage alarm on the radio? Was thinking of using a regulator but I already have the cc bec sitting here and I like I can adjust the voltage outpu with the cc link. Any thoughts?