Tips for SMPS design

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electrohawk

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Hello, Im designing a PSU with 3 switching elements and 1 LDO. One is a flyback (fs max 100khz) and the 2 others are buck (fixed 500khz and 2.1Mhz). Do you having 3 switching elements on the same pcb will cause a problem? Can you give me any advice regarding layout or any other issue that might cause problem?
 

Three problems could occur:
-ripple intermodulation (causing larger peak values)
-increased EMI
-perhaps one of the switchers sporadically losing control.

All of the science and black magic of designing a good PSU lies in in the PW board layout. It really is the key "component" in a PSU.
There is a lot of reading available on the web...............it is simply to much information to answer on a post.
 

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