I found this filter in an inherited design. It is supposed to filter some noisy input (around 13V) coming from a generator.
I'm new to designing filters and coils but something feels off here – I kind of expected a resistor for a low-pass. Is this some kind of standard filter against voltage spikes? I did not find any documentation for this.
The reason I'm asking is that recently I got a board back where D1 was burnt and I'm looking for ways to improve this.