On Sat, 10 Oct 2009 10:33:43 -0700, Archimedes' Lever
wrote:

On Fri, 9 Oct 2009 14:33:42 -0700 (PDT), "
wrote:


Filter capacitors and inductors too. It's not uncommon for switching
power supplies to be above 1MHz, also to keep the size of components
(and costs) small.

...and transformers get *very* big at DC.


I want a citation that switchers are commonly running at and above
1MHz.

AlwaysWrong strikes again.

One example, at random: LTC3555 three buck regulators, each 2.25MHz.

http://www.linear.com/pc/productDeta...C1773,P3 7856

NONE of ours did.

I'd be surprised if yours *worked*, DimBulb.