In our device we have used the part LMR23625CDDAR as a wide input regulator which takes the input from the load dump protection circuit and then gives output to the battery charger IC.
for our compliance test we provide upto 36v supply to the input of the device. during this testing when we supply around 31.6v we observe a loud humming sound coming from the direction of the LMR23625CDDAR.
only when we go above this limit we observe the sound!.
below is the input waveform for the LMR23625CDDAR coming from the load dump protection IC at 31.6v.
also the schematics of the IC circuit below.
what could be the reason for such loud noise. please provide your input on this issue on how could be eliminate the sound!.
Regards,
Aagneya C
