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enter image description here

Like, how does the resonance happen before the cross over frequency? Can someone explain the intuition behind it?

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  • \$\begingroup\$ en.wikipedia.org/wiki/Resonance \$\endgroup\$
    – jDAQ
    Aug 17 '21 at 17:36
  • \$\begingroup\$ LC resonance? Is the LC Filter at the Output of a Buck DC-DC , a low pass filter? \$\endgroup\$
    – Newbie
    Aug 17 '21 at 17:36
  • \$\begingroup\$ Like, how does the resonance happen before the cross over frequency? Can someone explain the intuition behind it? \$\endgroup\$
    – Newbie
    Aug 17 '21 at 17:45
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    \$\begingroup\$ Please add the schematic and all relevant assumptions to your post. \$\endgroup\$
    – nanofarad
    Aug 17 '21 at 17:51
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    \$\begingroup\$ Looks pretty normal to me but, you should be clear about the circuit. \$\endgroup\$
    – Andy aka
    Aug 17 '21 at 18:11
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Because of parasitics usually or from actual components. It's hard to say what it's coming from but the list includes the ESR of the inductor and capacitors or even compensation on the feedback loop. It occurs before the cross over frequency because any physical poles will create a pole that factors into the control loop.

In the case of a buck DC DC controller, it's the output filter that does (the paper shows the transfer function and the output response):

enter image description here
Source: https://www.researchgate.net/publication/238517757_Digitally-controlled_high-frequency_DC-DC_buck_converter

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