Funny Little Nose Fart, it's the sound you make when you
laugh with your mouth closed. Then there is FLNFWSp, which
is Funny Little Nose Fart With Spray. It happens when you
see an intellectual post from krw and you have a mouthful
of your preferred beverage.
While I don't condone is attitude, he is absolutely correct. MHz
switchers are common, have been in the field for years, and by the
demands for miniaturization are getting more common all the time. If you
don't believe me, pop open your PC, cell phone, PDA, etc and put a scope
on one of the DC-DC converters. Also with many of these chips, the
switching frequency is fixed and is not something the engineer has a
choice of. The duty cycle varies to regulate the output.
This is not something you'll find in the line operated power supply, but
applications like CPU core voltage which may have to supply less than 2V
at 50-80+ Amps (no, that's not a typo) from a 12V source where board
space is a valuable commodity, or applications needing extreme
miniaturization demand this sort of thing.
Thanks, I just looked at the products available from:
I've used their other products for years but I was not aware
of their switching regulator chips. The original discussion
concerned "SIMPLE" DC power supplies and some jerk chimed in
calling everyone stupid, etc. My experience has been with the
switching power supplies in computers and test gear which is
what I thought the discussion was about. I've never seen one
of those running at 1Mhz or more. A tiny regulator on a card
or motherboard running at 1Mhz or more is something new to me.
Heck, I learn something new everyday.
Just because you've never seen it doesn't mean it doesn't exist or is
not in common use. Here's your citation, note that the article is dated
"SMALLEST, 3V INPUT, 1MHz, 92% EFFICIENT DC-DC STEP-DOWN DELIVERS 10A"
So these are not off-line SMPS, but so what? They're still switchmode
power supplies by definition. TI and several others have similar parts.
It is very likely you have one right in front of you supplying the core
voltage to the CPU in your computer.
That is so cool, I still haven't come across one yet, that I know
of. Now I know what to look for. I'll have to look at the motherboards
of several of my computers. According to the date of the article,
the things have been around for a while.
Our power supply company survived after 911, a time when several
hundred other companies failed.
Those supplies were and are in a lot of the things you use because we
were OEMers for hundreds of companies as well.
You're an idiot, KeithTard.
Also, regardless of what the max frequency a regulator *can* operate
at, that does not mean that they get designed to operate there.
Folks engineer a supply on the bench, and the final most efficient
frequency a design runs at my not be the original estimation.
I would not expect you to get it though.
No... NONE of our units ran that fast. Magnetics tends to get
inefficient at passing power at too high a frequency. Our HV supplies
may have had switcher front ends, but they typically had a transformer
driven final feeding the multiplier stage. Most all were <100kHz.
That's exactly it. 400Hz power has been standard in aircraft for many
decades. Not only are the transformers smaller and lighter, but the
generators and motors too, and the filter capacitors in power supplies.
It's the reason switchmode power supplies run in the tens of kHz, and
some small ones are running as high as 1MHz. As the frequency increases,
switching losses in the semiconductors increase, but the size of the
energy storage components (inductors, transformers, capacitors)
decreases. A 60Hz transformer capable of supplying 300W might 15 lbs,
but a 20kHz transformer capable of the same power is less than a pound
and far more compact.
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