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I can't seem to get my head wrapped around what it takes for a buck converter to enter continuous conduction mode. I've read that a converter will stay in DCM when the load current is too low, so I've tried decreasing the load resistance. I've tried increasing the Vosc duty cycle, and I've tried increasing the the inductance as high as a few hundred uH. I feel like I'm just shooting in the dark due to my lack of understanding and am hoping someone can better explain to my why this converter won't run in CCM.

LTSpice schematic and graph of a simulated buck converter.

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  • \$\begingroup\$ How confident are you in the accuracy of your LMR33610A model? This is a pretty simplified model, and may not behave identically to the real IC. \$\endgroup\$ Commented 2 days ago
  • \$\begingroup\$ I notice you have a very high ESR output capacitor, too, which probably isn't helping matters. \$\endgroup\$ Commented 2 days ago
  • \$\begingroup\$ @Hearth I dont expect it to behave identically to the real IC, especially since I have no idea what their feedback loop looks like but from what I've read the feedback loop shouldnt have too much effect on the conduction mode...? \$\endgroup\$ Commented 2 days ago
  • \$\begingroup\$ Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. \$\endgroup\$ Commented 2 days ago
  • \$\begingroup\$ @ajegs If you don't expect it to behave like the real IC, why even bring up the LMR33610A at all? Are you asking a question about the LMR33610A or about a generic buck controller that you designed? \$\endgroup\$ Commented 2 days ago

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