Hi...regarding SMPS input filters........
Page 66-77 of Basso Book "switch mode power supplies" covers Input filters for SMPS.
snva538 by ti.com also covers Input filters of SMPS.
snva538
https://www.ti.com/lit/an/snva538/snva538.pdf?ts=1713952246374&ref_url=https%253A%252F%252Fwww.google.com%252FThe "DCM design guide" (A "DCM" is a type of DCDC SMPS module) by VicorPower also covers Input filters for SMPS on pages 11 to 33
DCM design guide
https://www.vicorpower.com/documents/design_guides/DG-DCM-Design-Guide-VICOR.pdf....Near bottom of page 23 of "DCM design guide" it states, (regarding an input LC filter for an SMPS)....
QUOTE>>>> Select the cut-off frequency below the crossover frequency (20kHz) of the DCM. <<<<UNQUOTE
That is, its saying the the cut-off frequency of the SMPS LC input filter should be below the SMPS's crossover frequency.
Neither Basso, nor ti.com, nor any other reference that i can find make this stipulation. Why do
VicorPower stipulate it?