Originally Posted By: mlord
... my multi-meter claims 1VAC is present at the input to the Buck (along with 34.8VDC). If that means what I think it means, then I've got about 3% ripple at that point.

My DSO claims 833mV of ripple, which works out to about 2.4%, at frequencies varying between 60Hz and 120Hz. The Buck switches at 150KHz, so I suppose the short bursts from it are confusing my easily befuddled DSO. smile

Cheers