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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Because 3 small buck converters are more cost-effective than one big one.
Some advantages:
The input and output ripple is at 3x the switching frequency, so less smoothing capacitance is needed.
The transient response can be 3x better for the same switching frequency. Newer multiphase controller chips react to a big load step from the CPU by overriding the switching sequence and jamming all the high-side FETs on at once. Again this saves money on capacitors.
These advantages could be had by running a single big converter at 3x the frequency, but then the switching losses would be 9x greater. (3x the parasitic capacitance, 3x the frequency.)
I used 3 as an example, but the advantages scale. If you need lots and lots of current for a high-end CPU, you can just add more and more phases.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Tom Williamson wrote ...
SMPS stuff
why didnt you say so.... thats easy, as others said you can get ASIC's for that. (application specific integrated circuits) so look at TI stuff on mouser or digikey.
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3 Phase Ferrite?
