▲ 7 r/PCB
My power circuit makes a whining noise
This PCB can be powered with USB or Solar using the BQ25798 IC. this then feeds into the buck which converts it down to 4V for a rail that feeds different LDOs for different devices.
The system works, and teh correct voltages and currents are supplied to the rest of the PCB, however,
Problems:
without a battery, the current going into the Buck is unstable, so it requires a battery always, which the BQ25798 says is not necessary. Could it be that I have set charging as always on ?
the circuit makes whining noises depending on what DC voltage is being supplied.
u/ozymandizz — 20 hours ago