I want to power 5v leds from a 12v source in my car using a "DC-DC Adjustable Step-down Buck Converter LM2596 3A". The source has a dimmer switch which can regulate the voltage from 12v to 1.25v reducing brightness of the instrument cluster.
What will happen if the input voltage falls below 5v? For example 2.5v, does the output voltage also drop to 2.5 and thereby reduce the brightness of the 5v leds? Or will the step down converter not allow current to flow at all?
Thanks in advance :)