I have a problem regarding the power supply and my circuit.
As the picture shown, my power supply is connected to a voltage regulator, Low Dropout Voltage regulator (LDO) to be precise. The part number of LDO is MP9486A. I'm sorry that I'm not allowed to display the schematic but the schematic just a basic one, taking 90V and output 5V.
My question is, when I power the circuit, I see a negative current display on the LED of my power supply. I wonder why are the possibilities that the negative current come from.