I have been using a “LM2596S Adjustable DC-DC Module” (can be found at 2pcs LM2596S Adjustable DC-DC Module | Open ImpulseOpen Impulse) to power an Uno. The converter is connected to a 12v motorcycle battery that is periodically trickle-charged (two times per day for 30 minutes each charge) by a 110vAC battery trickle charger. The regulator is adjusted to output 10.0vdc.
It works very well, but the web page says the following:
“Note: The input voltage must be at least 1.5V higher than the output voltage.”
What happens to the output voltage if I have the regulator’s output set at 10.00v, and the input voltage drops to, say, 11 volts or 10.5 volts between charging cycles? I’ve seen the battery drop to just slightly below 11.5vdc (like 11.4vdc), and there wasn’t any ill effect on the output. But what if the input voltage drops lower?