Hot swap controller audible noise

[caffeinatedbard]

Hi ,

I have a simple hotswap controller circuit with a high side fet and a common mode choke in series with the load and a 100uF capacitor in parallel with the load.

During testing, trying to test overcurrent with the circuit on sometimes I hear an audible buzzing sound when I short the + and - terminal.  Do you think that would be coming from the FET or from the common choke?

Any suggestions are appreciated.

-bard

[ConKbot]

What is the hot-swap controller?  If It might be retrying every few (hundred?) ms, making a nice pulsed waveform.  I'd expect the noise to be coming from the choke, and not the fet.

[nctnico]

FETs (and transistors in general) can make noise.

[envisionelec]

FETs (and transistors in general) can make noise.

Really? Wouldn't they disintegrate quickly? I've only known chokes and capacitors to make noise...

[caffeinatedbard]

The hot swap controller is the LTC4215.

[Phaedrus]

Put a dab of epoxy on your choke, if it isn't enclosed. That will dampen the vibration.

[nctnico]

FETs (and transistors in general) can make noise.

Really? Wouldn't they disintegrate quickly? I've only known chokes and capacitors to make noise...

Just run enough current through them. Its not harmful BTW.