3 ms·
> Strangely, putting the laptop under load makes the coil whine go away When the load is low, a switching regulator can enter "discontinuous conduction" mode,
by jbay808 4y ago
> Strangely, putting the laptop under load makes the coil whine go away
When the load is low, a switching regulator can enter "discontinuous conduction" mode, where the inductor current periodically drops to zero. This is typically noisier than continuous conduction mode, where current is mostly constant with a small sawtooth ripple.